In scenarios such as vehicle radiation monitoring and unmanned aerial vehicle radiation detection,rapid measurements using a NaI(Tl)detector often result in low photon counts,weak characteristic peaks,and significant ...In scenarios such as vehicle radiation monitoring and unmanned aerial vehicle radiation detection,rapid measurements using a NaI(Tl)detector often result in low photon counts,weak characteristic peaks,and significant statistical fluctuations.These issues can lead to potential failures in peak-searching-based identification methods.To address the low precision associated with short-duration measurements of radionuclides,this paper proposes an identification algorithm that leverages heterogeneous spectral transfer to develop a low-count energy spectral identification model.Comparative experiments demonstrated that transferring samples from 26 classes of simulated heterogeneous gamma spectra aids in creating a reliable model for measured gamma spectra.With only 10%of target domain samples used for training,the accuracy on real low-count spectral samples was 95.56%.This performance shows a significant improvement over widely employed full-spectrum analysis methods trained on target domain samples.The proposed method also exhibits strong generalization capabilities,effectively mitigating overfitting issues in low-count energy spectral classification under short-duration measurements.展开更多
Organic nanophotocatalysts are promising candidates for solar fuels production,but they still face the challenge of unfavorable geminate recombination due to the limited exciton diffusion lengths.Here,we introduce a b...Organic nanophotocatalysts are promising candidates for solar fuels production,but they still face the challenge of unfavorable geminate recombination due to the limited exciton diffusion lengths.Here,we introduce a binary nanophotocatalyst fabricated by blending two polymers,PS-PEG5(PS)and PBT-PEG5(PBT),with matched absorption and emission spectra,enabling a Forster resonance energy transfer(FRET)process for enhanced photocatalysis.These heterostructure nanophotocatalysts are processed using a facile and scalable flash nanoprecipitation(FNP)technique with precious kinetic control over binary nanoparticle formation.The resulting nanoparticles exhibit an exceptional photocatalytic hydrogen evolution rate up to 65 mmol g^(-1) h^(-1),2.5 times higher than that single component nanoparticles.Characterizations through fluorescence spectra and transient absorption spectra confirm the hetero-energy transfer within the binary nanoparticles,which prolongs the excited-state lifetime and extends the namely“effective exciton diffusion length”.Our finding opens new avenues for designing efficient organic photocatalysts by improving exciton migration.展开更多
Fluorescence lateral flow immunoassay(LFA)has emerged as a powerful tool for rapid screening of various biomarkers owing to its simplicity,sensitivity and flexibility.It is noteworthy that fluorescent probe mainly det...Fluorescence lateral flow immunoassay(LFA)has emerged as a powerful tool for rapid screening of various biomarkers owing to its simplicity,sensitivity and flexibility.It is noteworthy that fluorescent probe mainly determines the analytical performance of LFA.Due to the emission and excitation wavelengths are located in the visible region,most fluorophores are inevitably subject to light scattering and background autofluorescence.Herein,we reported a novel LFA sensor based on the second near-infrared(NIR-Ⅱ)fluorescent probe with excellent anti-interference capability.The designed NIR-Ⅱprobe was the Nd^(3+)and Yb^(3+)doped rare earth nanoparticles(RENPs)by employing Nd^(3+)as energy donor and Yb^(3+)as energy acceptor,which of the donor-acceptor energy transfer(ET)efficiency reached up to 80.7%.Meanwhile,relying on the convenient and effective encapsulation strategy of poly(lactic-co-glycolic acid)(PLGA)microspheres to RENPs,the surface functionalized NIR-Ⅱprobe(RE@PLGA)was obtained for subsequent bioconjugation.Benefiting from the optical advantages of NIR-Ⅱprobe,this proposed NIR-ⅡLFA displayed a good linear relationship ranging from 7 ng/mL to 200 ng/mL for the detection ofα-fetoprotein(AFP),an important biomarker of hepatocellular carcinoma(HCC).The limit of detection(LOD)was determined as low as 3.0 ng/m L,which was of 8.3 times lower than clinical cutoff value.It is promising that LFA sensor based on this efficient RENPs probe provides new opportunities for high sensitive detection of various biomarkers in biological samples.展开更多
Achieving artificial simulations of multi-step energy transfer processes and conversions in nature remains a challenge.In this study,we present a three-step sequential energy transfer process,which was constructed thr...Achieving artificial simulations of multi-step energy transfer processes and conversions in nature remains a challenge.In this study,we present a three-step sequential energy transfer process,which was constructed through host-vip interactions between a piperazine derivative(PPE-BPI)with aggregationinduced emission(AIE)and cucurbit[7]uril(CB[7])in water to serve as ideal energy donors.To achieve multi-step sequential energy transfer,we employ three distinct fluorescent dyes Eosin B(EsB),Sulforhodamine 101(SR101),and Cyanine 5(Cy5)as energy acceptors.The PPE-PBI-2CB[7]+EsB+SR101+Cy5 system demonstrates a highly efficient three-step sequential energy transfer mechanism,starting with PPEPBI-2CB[7]and transferring energy successively to EsB,SR101,and finally to Cy5,with remarkable energy transfer efficiencies.More interestingly,with the progressive transfer of energy in the multi-step energy transfer system,the generation efficiency of superoxide anion radical(O_(2)•-)increased gradually,which can be used as photocatalysts for selectively photooxidation of N-phenyltetrahydroisoquinoline in an aqueous medium with a high yield of 86%after irradiation for 18 h.This study offers a valuable investigation into the simulation of multi-step energy transfer processes and transformations in the natural world,paving the way for further research in the field.展开更多
A blue-red dual-emitting phosphor,Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+),Mn^(2+)was developed in this study.Eu^(2+)acts as a sensitizer ion in Na_(3)KMg_(7)(PO_(4))_(6):Mn^(2+),which significantly improves the undesirable ...A blue-red dual-emitting phosphor,Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+),Mn^(2+)was developed in this study.Eu^(2+)acts as a sensitizer ion in Na_(3)KMg_(7)(PO_(4))_(6):Mn^(2+),which significantly improves the undesirable luminous efficiency of Mn^(2+).The energy transfer between Eu^(2+)and Mn^(2+)significantly boosts both internal quantum efficiency(IQE)and external quantum efficiency(EQE)of the phosphor,achieving values of 72.5%and 42.6%,respectively.Additionally,the phosphor demonstrates exceptional thermal stability,at150℃.maintaining 71.49%of its initial emission intensity.The emission spectrum of the phosphor closely matches the chlorophyll's absorption spectra,with similarities of 75.06%and 94.52%,respectively.This was further confirmed through a fabricated LED with a n-UV chip(395 nm).To further assess the potential for agritech applications,a light-conversion film incorporating the developed phosphor in PDMS glue was prepared.An outdoor cultivation trial with Chlorella showed that the algae's growth rate improves by 27.3%relative to a control group.These results reveal the significant potential of the Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+),Mn^(2+)phosphor for enhancing plant growth in practical applications.展开更多
Nonlinear energy transfer is represented through eddy viscosity and stochastic forcing within the framework of resolvent analysis.Previous investigations estimate the contribution of eddy-viscosity-enhanced resolvent ...Nonlinear energy transfer is represented through eddy viscosity and stochastic forcing within the framework of resolvent analysis.Previous investigations estimate the contribution of eddy-viscosity-enhanced resolvent opera-tor to nonlinear energy transfer.The present article estimates the contribution of stochastic forcing to nonlinear energy transfer and demonstrates that the contribution of stochastic forcing cannot be ignored.These results are achieved by numerically comparing the eddy-viscosity-enhanced resolvent operator and stochastic forcing with nonlinear energy transfer in turbulent channel flows.Furthermore,the numerical results indicate that composite resolvent operators can improve the prediction of nonlinear energy transfer.展开更多
Lanthanide metal-organic frameworks(Ln-MOFs)have received extensive attention in the development of photoluminescent(PL)materials due to their stable structures and unique line-like emission spectroscopic properties.H...Lanthanide metal-organic frameworks(Ln-MOFs)have received extensive attention in the development of photoluminescent(PL)materials due to their stable structures and unique line-like emission spectroscopic properties.However,in order to prepare Ln-MOFs with high PL quantum yield(PLQY),further improving the sensitization efficiency of the“antenna effect”is essential.Herein,remarkably enhanced PL in[Tb_(2)(BDC)_(3)(DMF)_(2)(H_(2)O)_(2)]_n MOF is successfully achieved via high-pressure engineering at room temperature.Notably,the PL intensity continues to increase as the pressure increases,reaching its peak at 12.0 GPa,which is 4.4 times that of the initial state.Detailed experimental and theoretical calculations have demonstrated that pressure engineering significantly narrows the bandgap of[Tb_(2)(BDC)_(3)(DMF)_(2)(H_(2)O)_(2)]_n,optimizing both singlet and triplet energy levels.Ultimately,higher antenna effect sensitization efficiency is achieved by promoting intersystem crossing and energy transfer processes.Our work provides a promising strategy for the development of high PLQY Ln-MOFs.展开更多
Nickel-based cathodes in aqueous nickel-zinc batteries typically suffer from sluggish reaction kinetics and limited energy density.In situ introduction of metal phosphides and rational construction of heterostructures...Nickel-based cathodes in aqueous nickel-zinc batteries typically suffer from sluggish reaction kinetics and limited energy density.In situ introduction of metal phosphides and rational construction of heterostructures can effectively promote electron/ion transport.However,the complex evolution of phosphidation and intractable phosphidizing degree greatly affect the composition of active phase,active sites,charge transfer rate,and ion adsorption strength of cathodes.Herein,the critical bimetallic phosphide layer(CBPL)is constructed on the NiCo-layered double hydroxide(NiCo-LDH)skeleton by a controllable anion-exchange strategy,yielding a novel nanohybrid cathode(NiCo-P1.0,1.0 representing the mass ratio of Na_(2)H_(2)PO_(2)to NiCo-LDH).The high-conductivity CBPL with the inner NiCo-LDH forms extensive heterostructures,effectively regulating the electronic structure via charge transfer,thereby improving electrical conductivity.Remarkably,the CBPL exhibits unexpected electrochemical activity and synergizes with NiCo-LDH for electrode reactions,ultimately delivering extra energy.Benefiting from the bifunctional CBPL,NiCo-P1.0 delivers an optimal capacity of 286.64 mAh g^(−1)at 1C(1C=289 mAh g^(−1))and superb rate performance(a capacity retention of 72.22%at 40C).The assembled NiCo-P1.0//Zn battery achieves ultrahigh energy/power density(503.62 Wh kg^(−1)/18.62 kW kg^(−1),based on the mass loading of active material on the cathode),and the flexible quasi-solid-state pouch cell validates its practicality.This work demonstrates the superiority of bifunctional CBPL for surface modification,providing an effective and scalable compositing strategy in achieving high-performance cathodes for aqueous batteries.展开更多
Inorganic lead-free double perovskites have the advantages of low toxicity,broadband emission,and good stability,which make them promising luminescent materials for lighting applications.However,due to the limited reg...Inorganic lead-free double perovskites have the advantages of low toxicity,broadband emission,and good stability,which make them promising luminescent materials for lighting applications.However,due to the limited regulation of their self-trapped exciton emission,it is still greatly challenging to achieve white light emitting from a single double perovskite host.Herein,efficient and tunable white light is realized in Cs_(2)NalnCl_(6)∶Sb^(3+),Tb^(3+),Sm^(3+)double perovskite by controlling the ratios of the doped three ions with blue,green,and red emissions,respectively.The steady-state and transient fluorescence spectra of singly-and doubly-doped double perovskites reveal the existence of multiple energy transfer channels in the triply-doped phosphors,including from Sb^(3+)to Tb^(3+),Sb^(3+)to Sm^(3+),and Tb^(3+)to Sm^(3+).Benefiting from these channels,the color coordinates of the triply-doped phosphors can cross the whole white light area of the CIE chromaticity diagram by adjusting the ratios of the three dopants,and the maximum internal quantum yield of the white light phosphors is 66.61%.The white emission phosphors show the characteristic of being independent of excitation wavelength within 310-360 nm.Furthermore,the emission intensity at 430 K of the white light phosphor Cs_(2)NalnCl_(6)∶0.01Sb^(3+),0.65Tb^(3+),0.20Sm^(3+)remains 50% of that at room temperature.A WLED device fabricated with the phosphor and a 365 nm LED chip exhibits a high color rendering index of 90.9,correlated color temperature of 5469 K,and CIE coordinates of(0.333 and 0.328).The results indicate that the as-prepared double perovskite materials are promising candidates in the solid-state lighting field.展开更多
Sensitization of metal-centered forbidden transitions is of great significance.Solid MnII-based phosphors with d-d forbidden transition sensitized by CeIIIwith d-f allowed transition are promising light conversion mat...Sensitization of metal-centered forbidden transitions is of great significance.Solid MnII-based phosphors with d-d forbidden transition sensitized by CeIIIwith d-f allowed transition are promising light conversion materials,but the energy transfer mechanism in CeIII-MnIIis still in dispute for the uncertainty of distances between metal centers.Herein,for the first time,we explored the energy transfer mechanism in two well-designed luminescent heteronuclear complexes with clear crystal structures,i.e.,Ce-N8-Mn and Ce-N2O6-Mn(N8=1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane;N2O6=4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane).Short distances between metal centers facilitate efficient energy transfer from CeIIIto MnIIin both complexes,resulting in high photoluminescence quantum yield up to unity.After systematic study of the two heteronuclear complexes as well as two reference complexes Ce(N8)Br3and Ce(N2O6)Br3,we concluded that dipole-quadrupole interaction is the dominant energy transfer mechanism in the heteronuclear complexes.展开更多
Up to now,“Turn-on”fluorescence sensor exhibits promising potential toward the detection of heavy metal ions,anions,drugs,organic dyes,DNA,pesticides,and other amino acids due to their simple,quick detection,and hig...Up to now,“Turn-on”fluorescence sensor exhibits promising potential toward the detection of heavy metal ions,anions,drugs,organic dyes,DNA,pesticides,and other amino acids due to their simple,quick detection,and high sensitivity and selectivity.Herein,a novel fluorescence method of detecting Cr^(3+)in an aqueous solution was described based on the fluorescence resonance energy transfer between rhodamine B(Rh B)and gold nanoparticles(Au NPs).The fluorescence of Rh B solution could be obviously quenched(“off”state)with the presence of citrate-stabilized Au NPs.However,upon addition of Cr^(3+)to Au NPs@Rh B system,the fluorescence of Au NPs was recovered owing to the strong interaction between Cr^(3+)and the specific groups on the surface of citrate-stabilized Au NPs,which will lead to the aggregation of Au NPs(“on”state).At this point,the color of the reaction solution turned to black.Under optimal conditions,the limit of detection(LOD)for Cr^(3+)was 0.95 n M(signal-to-noise ratio,S/N=3)with a linear range of 0.164 n M to 3.270μM.Furthermore,the proposed method exhibits excellent performances,such as rapid analysis,high sensitivity,extraordinary selectivity,easy preparation,switch-on fluorescence response,and non-time consuming.展开更多
The construction of triplet-to-singlet F?rster resonance energy transfer(TS-FRET)systems has significantly contributed to the advancement of high-performance optoelectronic materials,particularly in the development of...The construction of triplet-to-singlet F?rster resonance energy transfer(TS-FRET)systems has significantly contributed to the advancement of high-performance optoelectronic materials,particularly in the development of metal-free organic environmental afterglow materials.Despite these notable advancements,achieving highly efficient energy transfer between luminescent donor and acceptor molecules remains a formidable challenge.In this study,we present the utilization of cation-πinteractions as an effective strategy to enhance TS-FRET efficiency,with the ultimate objective of further advancing fiuorescence afterglow materials.Our results demonstrate that the cation-πinteraction in 1D supramolecular nanorods(1D-SNRs)enhances the dipole-dipole coupling,a crucial parameter for regulating TS-FRET between the triplet state phosphorescent donor and singlet state fiuorescent acceptor.As a result,we achieved an outstanding TS-FRET efficiency of up to 97%.Furthermore,the 1D-SNRs exhibit a long-lifetime afterglow property,which suggests their potential application as a cost-effective and secure medium for information encryption.Thus,our findings highlight the promising prospects of cation-πinteractions in enhancing TS-FRET efficiency and advancing the field of organic photo-functional materials.展开更多
The interactions of charge transfer(CT)and nonradiative energy transfer(ET)in heterojunctions of two-dimensional(2D)transition metal dichalcogenides and quasi-2D single crystal perovskite thin films have the potential...The interactions of charge transfer(CT)and nonradiative energy transfer(ET)in heterojunctions of two-dimensional(2D)transition metal dichalcogenides and quasi-2D single crystal perovskite thin films have the potential applications in sensor,energy harvesting and solar cells.However,the CT and ET between them are not clear.Herein,we examine the ET in a(PEA)_(2)PbI_(4)/WS_(2)(PEA stands for phenethylamine and(PEA)_(2)PbI_(4)is abbreviated as PEPI)heterojunction using combined ultrafast spectroscopy and nonlinear optical absorption measurements.The ET from PEPI to WS_(2)predicted by band alignment is first observed with photoluminescence spectroscopy and then revealed by femtosecond transient absorption spectroscopy to exhibit a high ET efficiency approximating 68%.展开更多
In indoor environments,various batterypowered Internet of Things(IoT)devices,such as remote controllers and electronic tags on high-level shelves,require efficient energy management.However,manually monitoring remaini...In indoor environments,various batterypowered Internet of Things(IoT)devices,such as remote controllers and electronic tags on high-level shelves,require efficient energy management.However,manually monitoring remaining energy levels and battery replacement is both inadequate and costly.This paper introduces an energy management system for indoor IoT,which includes a mobile energy station(ES)for enabling on-demand wireless energy transfer(WET)in radio frequency(RF),some energy receivers(ERs),and a cloud server.By implementing a two-stage positioning system and embedding energy receivers into traditional IoT devices,we robustly manage their energy storage.The experimental results demonstrate that the energy receiver can harvest a minimum power of 58 mW.展开更多
Based on the finite-discrete element method,a three-dimensional numerical model for axial impact rock breaking was established and validated.A computational method for energy conversion during impact rock breaking was...Based on the finite-discrete element method,a three-dimensional numerical model for axial impact rock breaking was established and validated.A computational method for energy conversion during impact rock breaking was proposed,and the effects of conical tooth forward rake angle,rock temperature,and impact velocity on rock breaking characteristics and energy transfer laws were analyzed.The results show that during single impact rock breaking with conical tooth bits,merely 7.52%to 12.51%of the energy is utilized for rock breaking,while a significant 57.26%to 78.10%is dissipated as frictional loss.An insufficient forward rake angle increases tooth penetration depth and frictional loss,whereas an excessive forward rake angle reduces penetration capability,causing bit rebound and greater energy absorption by the drill rod.Thus,an optimal forward rake angle exists.Regarding environmental factors,high temperatures significantly enhance impact-induced rock breaking.Thermal damage from high temperatures reduces rock strength and inhibits its energy absorption.Finally,higher impact velocities intensify rock damage,yet excessively high velocities increase frictional loss and reduce the proportion of energy absorbed by the rock,thereby failing to substantially improve rock breaking efficiency.An optimal impact velocity exists.展开更多
Tb^(3+)-,Eu^(3+)-activated and Eu^(3+)/Tb^(3+)-coactivated TeO_(2)-Gd_(2)O_(3)-WO_(3)-ZnO(TGWZ)glasses with the density of about 6.60 g/cm^(3)were successfully synthesized by a melt-quenching method.These glass scinti...Tb^(3+)-,Eu^(3+)-activated and Eu^(3+)/Tb^(3+)-coactivated TeO_(2)-Gd_(2)O_(3)-WO_(3)-ZnO(TGWZ)glasses with the density of about 6.60 g/cm^(3)were successfully synthesized by a melt-quenching method.These glass scintillato rs show a line transmittance coefficient in excess of 80%in the strongest green-emitting regions of Tb^(3+)ions.The optimal concentration of incorporated Tb^(3+)and Eu^(3+)ions and the corresponding interaction mechanism are determined in both Tb^(3+)and Eu^(3+)-activated TGWZ glasses.Compared with that of Tb^(3+)-activated TGWZ glasses,the luminous intensity of the Eu^(3+)/Tb^(3+)-coactivated TGWZ glasses is enhanced by 7.6 times,which can be attributed to the effective energy transfer(ET)from Tb^(3+)to Eu^(3+)ions.By investigating the concentration-dependent optical properties of these glasses including transmittance,photoluminescence(excitation and emission spectra),photoluminescence decay,the mechanism of ET in Eu^(3+)/Tb^(3+)-coactivated TGWZ glass scintillators is obtained.Also,the potential scintillation properties of the TGWZ glass scintillators are discussed by X-excited luminescence(XEL)sp ectra and the corresponding X-ray dose response tailored by various current intensity within 0-240μA(which corresponds to 0-40000 mGy).展开更多
Integrated data and energy transfer(IDET)enables the electromagnetic waves to transmit wireless energy at the same time of data delivery for lowpower devices.In this paper,an energy harvesting modulation(EHM)assisted ...Integrated data and energy transfer(IDET)enables the electromagnetic waves to transmit wireless energy at the same time of data delivery for lowpower devices.In this paper,an energy harvesting modulation(EHM)assisted multi-user IDET system is studied,where all the received signals at the users are exploited for energy harvesting without the degradation of wireless data transfer(WDT)performance.The joint IDET performance is then analysed theoretically by conceiving a practical time-dependent wireless channel.With the aid of the AO based algorithm,the average effective data rate among users are maximized by ensuring the BER and the wireless energy transfer(WET)performance.Simulation results validate and evaluate the IDET performance of the EHM assisted system,which also demonstrates that the optimal number of user clusters and IDET time slots should be allocated,in order to improve the WET and WDT performance.展开更多
In this work, we designed and synthesized cationic carbon dots(CDs) with a size distribution of 1.6–3.7 nm, which exhibited dark blue fluorescence in the aqueous solution. Based on its excellent luminescence properti...In this work, we designed and synthesized cationic carbon dots(CDs) with a size distribution of 1.6–3.7 nm, which exhibited dark blue fluorescence in the aqueous solution. Based on its excellent luminescence properties, we used it as an energy donor to construct a sequential artificial light-harvesting system(LHS) by employing the energy-matching dyes eosin Y disodium salt(EY) and sulforhodamine101(SR101), which could regulate the white light emission(Commission Internationale de l'Eclairage(CIE) coordinate:(0.30, 0.31)) with the energy transfer efficiency(ΦET) of 53.9% and 20.0%. Moreover, a single-step artificial LHS with white light emission(0.32, 0.28) can be constructed directly using CDs and dye solvent 43(SR) with ΦETand antenna effect(AE) of 48.8% and 6.5, respectively. More importantly,CDs-based artificial LHSs were firstly used in photocatalytic of α-bromoacetophenone, with a yield of90%. This work not only provides a new strategy for constructing CDs-based LHSs, but also opens up a new application for further applying the energy harvested in CDs-based LHSs to the field of the aqueous solution photocatalysis.展开更多
A series of Dy^(3+)/Eu^(3+) single doped and co-doped SrLaAlO_(4) phosphors was synthesized by the traditional high-temperature solid-state method,and their structure,morphology and optical properties were characteriz...A series of Dy^(3+)/Eu^(3+) single doped and co-doped SrLaAlO_(4) phosphors was synthesized by the traditional high-temperature solid-state method,and their structure,morphology and optical properties were characterized.The X-ray diffraction(XRD) shows a small amount of doping with Dy^(3+) and Eu^(3+) does not change the crystal structure of the matrix SrLaAlO_(4) and the best synthesis temperature is 1450℃.The scanning electron microscopy(SEM) indicates the particle size directly ranges from 1 to 5μm roughly and the energy dispersive spectroscopy(EDS) patterns show that SrLaAlO_(4):Dy^(3+) phosphor and SrLaAlO_(4):Dy^(3+),Eu^(3+) phosphor were successfully synthesized.SrLaAlO_(4):Dy^(3+) phosphor can be effectively excited by near-ultraviolet light,producing two strong emission lights at 483 nm(blue light) and 579 nm(yellow light),presenting a cold white light;SrLaAlO_(4):Eu^(3+) phosphor can be effectively excited by nearultraviolet light,producing red lights at 622 nm;the characteristic emission peaks of Dy^(3+) and Eu^(3+)can be shown simultaneously under the same excitation wavelength in SrLaAlO_(4):Dy^(3+), Eu^(3+) phosphor.By changing the relative doping concentration ratio of Dy^(3+) and Eu^(3+),the modulation of SrLaAlO_(4):Dy^(3+),Eu3+phosphor from cold white to warm white light can be achieved.In addition,the study of the luminescent mechanism and lifetime shows that there is energy transfer between Dy^(3+) and Eu^(3+) in SrLaAlO_(4):Dy^(3+),Eu^(3+) phosphor.展开更多
Energy transfer is ubiquitous in natural and artificial lightharvesting systems,and coherent energy transfer,a highly efficient energy transfer process,has been accepted to play a vital role in such systems.However,th...Energy transfer is ubiquitous in natural and artificial lightharvesting systems,and coherent energy transfer,a highly efficient energy transfer process,has been accepted to play a vital role in such systems.However,the energy oscillation of coherent energy transfer is exceedingly difficult to capture because of its evanescence due to the interaction with a thermal environment.Here a microscopic quantum model is used to study the time evolution of electrons triggered energy transfer between coherently coupled donoracceptor molecules in scanning tunneling microscope(STM).A series of topics in the plasmonic nanocavity(PNC)coupled donor-acceptor molecules system are discussed,including resonant and nonresonant coherent energy transfer,dephasing assisted energy transfer,PNC coupling strength dependent energy transfer,Fano resonance of coherently coupled donor-acceptor molecules,and polariton-mediated energy transfer.展开更多
基金supported by the National Defense Fundamental Research Project(No.JCKY2022404C005)the Nuclear Energy Development Project(No.23ZG6106)+1 种基金the Sichuan Scientific and Technological Achievements Transfer and Transformation Demonstration Project(No.2023ZHCG0026)the Mianyang Applied Technology Research and Development Project(No.2021ZYZF1005)。
文摘In scenarios such as vehicle radiation monitoring and unmanned aerial vehicle radiation detection,rapid measurements using a NaI(Tl)detector often result in low photon counts,weak characteristic peaks,and significant statistical fluctuations.These issues can lead to potential failures in peak-searching-based identification methods.To address the low precision associated with short-duration measurements of radionuclides,this paper proposes an identification algorithm that leverages heterogeneous spectral transfer to develop a low-count energy spectral identification model.Comparative experiments demonstrated that transferring samples from 26 classes of simulated heterogeneous gamma spectra aids in creating a reliable model for measured gamma spectra.With only 10%of target domain samples used for training,the accuracy on real low-count spectral samples was 95.56%.This performance shows a significant improvement over widely employed full-spectrum analysis methods trained on target domain samples.The proposed method also exhibits strong generalization capabilities,effectively mitigating overfitting issues in low-count energy spectral classification under short-duration measurements.
基金supported by National Natural Science Foundation of China(NSFC,22338006,92356301,9235630033 and 22375062)Shanghai Municipal Science and Technology Major Project(21JC1401700)+4 种基金Shanghai Pilot Program for Basic Research(22TQ1400100-10)Fundamental Research Funds for the Central UniversitiesShanghai Pujiang Program(22PJ1402400)“Chenguang Program”supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(22CGA32)the Young Elite Scientists Sponsorship Program by CAST(2023QNRC001).
文摘Organic nanophotocatalysts are promising candidates for solar fuels production,but they still face the challenge of unfavorable geminate recombination due to the limited exciton diffusion lengths.Here,we introduce a binary nanophotocatalyst fabricated by blending two polymers,PS-PEG5(PS)and PBT-PEG5(PBT),with matched absorption and emission spectra,enabling a Forster resonance energy transfer(FRET)process for enhanced photocatalysis.These heterostructure nanophotocatalysts are processed using a facile and scalable flash nanoprecipitation(FNP)technique with precious kinetic control over binary nanoparticle formation.The resulting nanoparticles exhibit an exceptional photocatalytic hydrogen evolution rate up to 65 mmol g^(-1) h^(-1),2.5 times higher than that single component nanoparticles.Characterizations through fluorescence spectra and transient absorption spectra confirm the hetero-energy transfer within the binary nanoparticles,which prolongs the excited-state lifetime and extends the namely“effective exciton diffusion length”.Our finding opens new avenues for designing efficient organic photocatalysts by improving exciton migration.
基金supported by the National Natural Science Foundation of China(Nos.U2267221,22107029,22377135)the Bohai Rim Advanced Research Institute for Drug Discovery(No.LX215002)+5 种基金the Natural Science Foundation of Shandong Province(No.ZR2022QH212)the Taishan Scholars Program(No.tsqn202312305)the Young Elite Scientists Sponsorship Program by Chinese Chemical Societythe Fundamental Research Projects of Science&Technology Innovation and development Plan in Yantai City(No.2023JCYJ059)the Shandong Laboratory Program(No.SYS202205)the Shanghai Postdoctoral Excellence Program(No.2023704)。
文摘Fluorescence lateral flow immunoassay(LFA)has emerged as a powerful tool for rapid screening of various biomarkers owing to its simplicity,sensitivity and flexibility.It is noteworthy that fluorescent probe mainly determines the analytical performance of LFA.Due to the emission and excitation wavelengths are located in the visible region,most fluorophores are inevitably subject to light scattering and background autofluorescence.Herein,we reported a novel LFA sensor based on the second near-infrared(NIR-Ⅱ)fluorescent probe with excellent anti-interference capability.The designed NIR-Ⅱprobe was the Nd^(3+)and Yb^(3+)doped rare earth nanoparticles(RENPs)by employing Nd^(3+)as energy donor and Yb^(3+)as energy acceptor,which of the donor-acceptor energy transfer(ET)efficiency reached up to 80.7%.Meanwhile,relying on the convenient and effective encapsulation strategy of poly(lactic-co-glycolic acid)(PLGA)microspheres to RENPs,the surface functionalized NIR-Ⅱprobe(RE@PLGA)was obtained for subsequent bioconjugation.Benefiting from the optical advantages of NIR-Ⅱprobe,this proposed NIR-ⅡLFA displayed a good linear relationship ranging from 7 ng/mL to 200 ng/mL for the detection ofα-fetoprotein(AFP),an important biomarker of hepatocellular carcinoma(HCC).The limit of detection(LOD)was determined as low as 3.0 ng/m L,which was of 8.3 times lower than clinical cutoff value.It is promising that LFA sensor based on this efficient RENPs probe provides new opportunities for high sensitive detection of various biomarkers in biological samples.
基金the National Natural Science Foundation of China(No.52205210)the Natural Science Foundation of Shandong Province(Nos.ZR2020MB018,ZR2022QE033 and ZR2021QB049).
文摘Achieving artificial simulations of multi-step energy transfer processes and conversions in nature remains a challenge.In this study,we present a three-step sequential energy transfer process,which was constructed through host-vip interactions between a piperazine derivative(PPE-BPI)with aggregationinduced emission(AIE)and cucurbit[7]uril(CB[7])in water to serve as ideal energy donors.To achieve multi-step sequential energy transfer,we employ three distinct fluorescent dyes Eosin B(EsB),Sulforhodamine 101(SR101),and Cyanine 5(Cy5)as energy acceptors.The PPE-PBI-2CB[7]+EsB+SR101+Cy5 system demonstrates a highly efficient three-step sequential energy transfer mechanism,starting with PPEPBI-2CB[7]and transferring energy successively to EsB,SR101,and finally to Cy5,with remarkable energy transfer efficiencies.More interestingly,with the progressive transfer of energy in the multi-step energy transfer system,the generation efficiency of superoxide anion radical(O_(2)•-)increased gradually,which can be used as photocatalysts for selectively photooxidation of N-phenyltetrahydroisoquinoline in an aqueous medium with a high yield of 86%after irradiation for 18 h.This study offers a valuable investigation into the simulation of multi-step energy transfer processes and transformations in the natural world,paving the way for further research in the field.
基金supported by the Department of Industry and Information Technology of Gansu Province(2024 Provincial Key Talent Program)the National Natural Science Foundation of China(U22A20136)。
文摘A blue-red dual-emitting phosphor,Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+),Mn^(2+)was developed in this study.Eu^(2+)acts as a sensitizer ion in Na_(3)KMg_(7)(PO_(4))_(6):Mn^(2+),which significantly improves the undesirable luminous efficiency of Mn^(2+).The energy transfer between Eu^(2+)and Mn^(2+)significantly boosts both internal quantum efficiency(IQE)and external quantum efficiency(EQE)of the phosphor,achieving values of 72.5%and 42.6%,respectively.Additionally,the phosphor demonstrates exceptional thermal stability,at150℃.maintaining 71.49%of its initial emission intensity.The emission spectrum of the phosphor closely matches the chlorophyll's absorption spectra,with similarities of 75.06%and 94.52%,respectively.This was further confirmed through a fabricated LED with a n-UV chip(395 nm).To further assess the potential for agritech applications,a light-conversion film incorporating the developed phosphor in PDMS glue was prepared.An outdoor cultivation trial with Chlorella showed that the algae's growth rate improves by 27.3%relative to a control group.These results reveal the significant potential of the Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+),Mn^(2+)phosphor for enhancing plant growth in practical applications.
基金supported by the National Natural Science Foundation of China(NSFC)Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics(Grant No.11988102).
文摘Nonlinear energy transfer is represented through eddy viscosity and stochastic forcing within the framework of resolvent analysis.Previous investigations estimate the contribution of eddy-viscosity-enhanced resolvent opera-tor to nonlinear energy transfer.The present article estimates the contribution of stochastic forcing to nonlinear energy transfer and demonstrates that the contribution of stochastic forcing cannot be ignored.These results are achieved by numerically comparing the eddy-viscosity-enhanced resolvent operator and stochastic forcing with nonlinear energy transfer in turbulent channel flows.Furthermore,the numerical results indicate that composite resolvent operators can improve the prediction of nonlinear energy transfer.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12304261 and 12274177)the China Postdoctoral Science Foundation(Grant No.2024M751076)。
文摘Lanthanide metal-organic frameworks(Ln-MOFs)have received extensive attention in the development of photoluminescent(PL)materials due to their stable structures and unique line-like emission spectroscopic properties.However,in order to prepare Ln-MOFs with high PL quantum yield(PLQY),further improving the sensitization efficiency of the“antenna effect”is essential.Herein,remarkably enhanced PL in[Tb_(2)(BDC)_(3)(DMF)_(2)(H_(2)O)_(2)]_n MOF is successfully achieved via high-pressure engineering at room temperature.Notably,the PL intensity continues to increase as the pressure increases,reaching its peak at 12.0 GPa,which is 4.4 times that of the initial state.Detailed experimental and theoretical calculations have demonstrated that pressure engineering significantly narrows the bandgap of[Tb_(2)(BDC)_(3)(DMF)_(2)(H_(2)O)_(2)]_n,optimizing both singlet and triplet energy levels.Ultimately,higher antenna effect sensitization efficiency is achieved by promoting intersystem crossing and energy transfer processes.Our work provides a promising strategy for the development of high PLQY Ln-MOFs.
基金supported by the National Natural Science Foundation of China(No.52373249,W2433146)the Science and Technology Project of Yibin Sanjiang New Area(No.2023SJXQSXZJ003)the Fundamental Research Funds for the Central Universities(No.20822041F4045).
文摘Nickel-based cathodes in aqueous nickel-zinc batteries typically suffer from sluggish reaction kinetics and limited energy density.In situ introduction of metal phosphides and rational construction of heterostructures can effectively promote electron/ion transport.However,the complex evolution of phosphidation and intractable phosphidizing degree greatly affect the composition of active phase,active sites,charge transfer rate,and ion adsorption strength of cathodes.Herein,the critical bimetallic phosphide layer(CBPL)is constructed on the NiCo-layered double hydroxide(NiCo-LDH)skeleton by a controllable anion-exchange strategy,yielding a novel nanohybrid cathode(NiCo-P1.0,1.0 representing the mass ratio of Na_(2)H_(2)PO_(2)to NiCo-LDH).The high-conductivity CBPL with the inner NiCo-LDH forms extensive heterostructures,effectively regulating the electronic structure via charge transfer,thereby improving electrical conductivity.Remarkably,the CBPL exhibits unexpected electrochemical activity and synergizes with NiCo-LDH for electrode reactions,ultimately delivering extra energy.Benefiting from the bifunctional CBPL,NiCo-P1.0 delivers an optimal capacity of 286.64 mAh g^(−1)at 1C(1C=289 mAh g^(−1))and superb rate performance(a capacity retention of 72.22%at 40C).The assembled NiCo-P1.0//Zn battery achieves ultrahigh energy/power density(503.62 Wh kg^(−1)/18.62 kW kg^(−1),based on the mass loading of active material on the cathode),and the flexible quasi-solid-state pouch cell validates its practicality.This work demonstrates the superiority of bifunctional CBPL for surface modification,providing an effective and scalable compositing strategy in achieving high-performance cathodes for aqueous batteries.
基金supported by grants from the National Natural Science Foundation of China(NSFC Nos.51972347 and 21771195).
文摘Inorganic lead-free double perovskites have the advantages of low toxicity,broadband emission,and good stability,which make them promising luminescent materials for lighting applications.However,due to the limited regulation of their self-trapped exciton emission,it is still greatly challenging to achieve white light emitting from a single double perovskite host.Herein,efficient and tunable white light is realized in Cs_(2)NalnCl_(6)∶Sb^(3+),Tb^(3+),Sm^(3+)double perovskite by controlling the ratios of the doped three ions with blue,green,and red emissions,respectively.The steady-state and transient fluorescence spectra of singly-and doubly-doped double perovskites reveal the existence of multiple energy transfer channels in the triply-doped phosphors,including from Sb^(3+)to Tb^(3+),Sb^(3+)to Sm^(3+),and Tb^(3+)to Sm^(3+).Benefiting from these channels,the color coordinates of the triply-doped phosphors can cross the whole white light area of the CIE chromaticity diagram by adjusting the ratios of the three dopants,and the maximum internal quantum yield of the white light phosphors is 66.61%.The white emission phosphors show the characteristic of being independent of excitation wavelength within 310-360 nm.Furthermore,the emission intensity at 430 K of the white light phosphor Cs_(2)NalnCl_(6)∶0.01Sb^(3+),0.65Tb^(3+),0.20Sm^(3+)remains 50% of that at room temperature.A WLED device fabricated with the phosphor and a 365 nm LED chip exhibits a high color rendering index of 90.9,correlated color temperature of 5469 K,and CIE coordinates of(0.333 and 0.328).The results indicate that the as-prepared double perovskite materials are promising candidates in the solid-state lighting field.
基金financial support from the National Key R&D Program of China(Nos.2022YFB3503702,2023YFB3506901,2021YFB3501800)the National Natural Science Foundation of China(Nos.92156016,62104013,22071003)。
文摘Sensitization of metal-centered forbidden transitions is of great significance.Solid MnII-based phosphors with d-d forbidden transition sensitized by CeIIIwith d-f allowed transition are promising light conversion materials,but the energy transfer mechanism in CeIII-MnIIis still in dispute for the uncertainty of distances between metal centers.Herein,for the first time,we explored the energy transfer mechanism in two well-designed luminescent heteronuclear complexes with clear crystal structures,i.e.,Ce-N8-Mn and Ce-N2O6-Mn(N8=1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane;N2O6=4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane).Short distances between metal centers facilitate efficient energy transfer from CeIIIto MnIIin both complexes,resulting in high photoluminescence quantum yield up to unity.After systematic study of the two heteronuclear complexes as well as two reference complexes Ce(N8)Br3and Ce(N2O6)Br3,we concluded that dipole-quadrupole interaction is the dominant energy transfer mechanism in the heteronuclear complexes.
基金supported by the Natural Science Foundation of Qinghai Province in China(No.2019-ZJ-944Q)the University-level Planning Project of Qinghai Minzu University of Qinghai Province in China(Nos.2022GH11 and 2022GH13)。
文摘Up to now,“Turn-on”fluorescence sensor exhibits promising potential toward the detection of heavy metal ions,anions,drugs,organic dyes,DNA,pesticides,and other amino acids due to their simple,quick detection,and high sensitivity and selectivity.Herein,a novel fluorescence method of detecting Cr^(3+)in an aqueous solution was described based on the fluorescence resonance energy transfer between rhodamine B(Rh B)and gold nanoparticles(Au NPs).The fluorescence of Rh B solution could be obviously quenched(“off”state)with the presence of citrate-stabilized Au NPs.However,upon addition of Cr^(3+)to Au NPs@Rh B system,the fluorescence of Au NPs was recovered owing to the strong interaction between Cr^(3+)and the specific groups on the surface of citrate-stabilized Au NPs,which will lead to the aggregation of Au NPs(“on”state).At this point,the color of the reaction solution turned to black.Under optimal conditions,the limit of detection(LOD)for Cr^(3+)was 0.95 n M(signal-to-noise ratio,S/N=3)with a linear range of 0.164 n M to 3.270μM.Furthermore,the proposed method exhibits excellent performances,such as rapid analysis,high sensitivity,extraordinary selectivity,easy preparation,switch-on fluorescence response,and non-time consuming.
基金financially supported by the National Natural Science Foundation of China(Nos.22071197,22022107)Key Research Program of Frontier Sciences,CAS(No.QYZDJ-SSW-SLH044)+2 种基金Key Research Program of the Chinese Academy of Sciences,(No.XDPB01)Fundamental Research Funds for the Central Universities(No.D5000230114)China Postdoctoral Science Foundation(No.2023M730951)。
文摘The construction of triplet-to-singlet F?rster resonance energy transfer(TS-FRET)systems has significantly contributed to the advancement of high-performance optoelectronic materials,particularly in the development of metal-free organic environmental afterglow materials.Despite these notable advancements,achieving highly efficient energy transfer between luminescent donor and acceptor molecules remains a formidable challenge.In this study,we present the utilization of cation-πinteractions as an effective strategy to enhance TS-FRET efficiency,with the ultimate objective of further advancing fiuorescence afterglow materials.Our results demonstrate that the cation-πinteraction in 1D supramolecular nanorods(1D-SNRs)enhances the dipole-dipole coupling,a crucial parameter for regulating TS-FRET between the triplet state phosphorescent donor and singlet state fiuorescent acceptor.As a result,we achieved an outstanding TS-FRET efficiency of up to 97%.Furthermore,the 1D-SNRs exhibit a long-lifetime afterglow property,which suggests their potential application as a cost-effective and secure medium for information encryption.Thus,our findings highlight the promising prospects of cation-πinteractions in enhancing TS-FRET efficiency and advancing the field of organic photo-functional materials.
基金financially supported by the National Natural Science Foundation of China(Nos.52472153,11704081,and 62175210)Guangxi Natural Science Foundation(No.2020GXNSFAA297182)the special fund for"Guangxi Bagui Scholars,"National Science and Technology Innovation Talent Cultivation Program(No.2023BZRC016)
文摘The interactions of charge transfer(CT)and nonradiative energy transfer(ET)in heterojunctions of two-dimensional(2D)transition metal dichalcogenides and quasi-2D single crystal perovskite thin films have the potential applications in sensor,energy harvesting and solar cells.However,the CT and ET between them are not clear.Herein,we examine the ET in a(PEA)_(2)PbI_(4)/WS_(2)(PEA stands for phenethylamine and(PEA)_(2)PbI_(4)is abbreviated as PEPI)heterojunction using combined ultrafast spectroscopy and nonlinear optical absorption measurements.The ET from PEPI to WS_(2)predicted by band alignment is first observed with photoluminescence spectroscopy and then revealed by femtosecond transient absorption spectroscopy to exhibit a high ET efficiency approximating 68%.
基金supported in part by the Natural Science Foundation of China(NSFC)under Grant 61971102in part by the Key Research and Development Program of Zhejiang Province under Grant 2022C01093.
文摘In indoor environments,various batterypowered Internet of Things(IoT)devices,such as remote controllers and electronic tags on high-level shelves,require efficient energy management.However,manually monitoring remaining energy levels and battery replacement is both inadequate and costly.This paper introduces an energy management system for indoor IoT,which includes a mobile energy station(ES)for enabling on-demand wireless energy transfer(WET)in radio frequency(RF),some energy receivers(ERs),and a cloud server.By implementing a two-stage positioning system and embedding energy receivers into traditional IoT devices,we robustly manage their energy storage.The experimental results demonstrate that the energy receiver can harvest a minimum power of 58 mW.
基金Supported by Major Instrument Project of National Natural Science Foundation of China(52327803)Major Project of National Natural Science Foundation of China(52192622).
文摘Based on the finite-discrete element method,a three-dimensional numerical model for axial impact rock breaking was established and validated.A computational method for energy conversion during impact rock breaking was proposed,and the effects of conical tooth forward rake angle,rock temperature,and impact velocity on rock breaking characteristics and energy transfer laws were analyzed.The results show that during single impact rock breaking with conical tooth bits,merely 7.52%to 12.51%of the energy is utilized for rock breaking,while a significant 57.26%to 78.10%is dissipated as frictional loss.An insufficient forward rake angle increases tooth penetration depth and frictional loss,whereas an excessive forward rake angle reduces penetration capability,causing bit rebound and greater energy absorption by the drill rod.Thus,an optimal forward rake angle exists.Regarding environmental factors,high temperatures significantly enhance impact-induced rock breaking.Thermal damage from high temperatures reduces rock strength and inhibits its energy absorption.Finally,higher impact velocities intensify rock damage,yet excessively high velocities increase frictional loss and reduce the proportion of energy absorbed by the rock,thereby failing to substantially improve rock breaking efficiency.An optimal impact velocity exists.
基金Project supported by the Natural Science Foundation of China(12065010)the Major Science and Technology Research and Development Project of Jiangxi Province(20223AAE01003)+3 种基金the Scientific Research Project of Jiangxi Provincial Department of Education(GJJ211005,GJJ2201656)the Jiangxi Provincial Natural Science Foundation(20224BAB211019,20224BAB211027)the Science and Technology Plan Project of Ji'an City(20233-117685)the opening fund of Key Laboratory of Rare Earths,the Chinese Academy of Sciences。
文摘Tb^(3+)-,Eu^(3+)-activated and Eu^(3+)/Tb^(3+)-coactivated TeO_(2)-Gd_(2)O_(3)-WO_(3)-ZnO(TGWZ)glasses with the density of about 6.60 g/cm^(3)were successfully synthesized by a melt-quenching method.These glass scintillato rs show a line transmittance coefficient in excess of 80%in the strongest green-emitting regions of Tb^(3+)ions.The optimal concentration of incorporated Tb^(3+)and Eu^(3+)ions and the corresponding interaction mechanism are determined in both Tb^(3+)and Eu^(3+)-activated TGWZ glasses.Compared with that of Tb^(3+)-activated TGWZ glasses,the luminous intensity of the Eu^(3+)/Tb^(3+)-coactivated TGWZ glasses is enhanced by 7.6 times,which can be attributed to the effective energy transfer(ET)from Tb^(3+)to Eu^(3+)ions.By investigating the concentration-dependent optical properties of these glasses including transmittance,photoluminescence(excitation and emission spectra),photoluminescence decay,the mechanism of ET in Eu^(3+)/Tb^(3+)-coactivated TGWZ glass scintillators is obtained.Also,the potential scintillation properties of the TGWZ glass scintillators are discussed by X-excited luminescence(XEL)sp ectra and the corresponding X-ray dose response tailored by various current intensity within 0-240μA(which corresponds to 0-40000 mGy).
基金supported in part by the MOST Major Research and Development Project(Grant No.2021YFB2900204)the National Natural Science Foundation of China(NSFC)(Grant No.62201123,No.62132004,No.61971102)+3 种基金China Postdoctoral Science Foundation(Grant No.2022TQ0056)in part by the financial support of the Sichuan Science and Technology Program(Grant No.2022YFH0022)Sichuan Major R&D Project(Grant No.22QYCX0168)the Municipal Government of Quzhou(Grant No.2022D031)。
文摘Integrated data and energy transfer(IDET)enables the electromagnetic waves to transmit wireless energy at the same time of data delivery for lowpower devices.In this paper,an energy harvesting modulation(EHM)assisted multi-user IDET system is studied,where all the received signals at the users are exploited for energy harvesting without the degradation of wireless data transfer(WDT)performance.The joint IDET performance is then analysed theoretically by conceiving a practical time-dependent wireless channel.With the aid of the AO based algorithm,the average effective data rate among users are maximized by ensuring the BER and the wireless energy transfer(WET)performance.Simulation results validate and evaluate the IDET performance of the EHM assisted system,which also demonstrates that the optimal number of user clusters and IDET time slots should be allocated,in order to improve the WET and WDT performance.
基金the financial support from the National Natural Science Foundation of China (Nos.52205210 and 22002075)the Natural Science Foundation of Shandong Province (Nos.ZR2020MB018 and ZR2022QE033)。
文摘In this work, we designed and synthesized cationic carbon dots(CDs) with a size distribution of 1.6–3.7 nm, which exhibited dark blue fluorescence in the aqueous solution. Based on its excellent luminescence properties, we used it as an energy donor to construct a sequential artificial light-harvesting system(LHS) by employing the energy-matching dyes eosin Y disodium salt(EY) and sulforhodamine101(SR101), which could regulate the white light emission(Commission Internationale de l'Eclairage(CIE) coordinate:(0.30, 0.31)) with the energy transfer efficiency(ΦET) of 53.9% and 20.0%. Moreover, a single-step artificial LHS with white light emission(0.32, 0.28) can be constructed directly using CDs and dye solvent 43(SR) with ΦETand antenna effect(AE) of 48.8% and 6.5, respectively. More importantly,CDs-based artificial LHSs were firstly used in photocatalytic of α-bromoacetophenone, with a yield of90%. This work not only provides a new strategy for constructing CDs-based LHSs, but also opens up a new application for further applying the energy harvested in CDs-based LHSs to the field of the aqueous solution photocatalysis.
基金Project supported by Outstanding Young and Middle-aged Scientific Innovation Team of Colleges and Universities of Hubei Province(T2020008)。
文摘A series of Dy^(3+)/Eu^(3+) single doped and co-doped SrLaAlO_(4) phosphors was synthesized by the traditional high-temperature solid-state method,and their structure,morphology and optical properties were characterized.The X-ray diffraction(XRD) shows a small amount of doping with Dy^(3+) and Eu^(3+) does not change the crystal structure of the matrix SrLaAlO_(4) and the best synthesis temperature is 1450℃.The scanning electron microscopy(SEM) indicates the particle size directly ranges from 1 to 5μm roughly and the energy dispersive spectroscopy(EDS) patterns show that SrLaAlO_(4):Dy^(3+) phosphor and SrLaAlO_(4):Dy^(3+),Eu^(3+) phosphor were successfully synthesized.SrLaAlO_(4):Dy^(3+) phosphor can be effectively excited by near-ultraviolet light,producing two strong emission lights at 483 nm(blue light) and 579 nm(yellow light),presenting a cold white light;SrLaAlO_(4):Eu^(3+) phosphor can be effectively excited by nearultraviolet light,producing red lights at 622 nm;the characteristic emission peaks of Dy^(3+) and Eu^(3+)can be shown simultaneously under the same excitation wavelength in SrLaAlO_(4):Dy^(3+), Eu^(3+) phosphor.By changing the relative doping concentration ratio of Dy^(3+) and Eu^(3+),the modulation of SrLaAlO_(4):Dy^(3+),Eu3+phosphor from cold white to warm white light can be achieved.In addition,the study of the luminescent mechanism and lifetime shows that there is energy transfer between Dy^(3+) and Eu^(3+) in SrLaAlO_(4):Dy^(3+),Eu^(3+) phosphor.
基金supported by the State Scholarship Fund organized by the China Scholarship Council(CSC).
文摘Energy transfer is ubiquitous in natural and artificial lightharvesting systems,and coherent energy transfer,a highly efficient energy transfer process,has been accepted to play a vital role in such systems.However,the energy oscillation of coherent energy transfer is exceedingly difficult to capture because of its evanescence due to the interaction with a thermal environment.Here a microscopic quantum model is used to study the time evolution of electrons triggered energy transfer between coherently coupled donoracceptor molecules in scanning tunneling microscope(STM).A series of topics in the plasmonic nanocavity(PNC)coupled donor-acceptor molecules system are discussed,including resonant and nonresonant coherent energy transfer,dephasing assisted energy transfer,PNC coupling strength dependent energy transfer,Fano resonance of coherently coupled donor-acceptor molecules,and polariton-mediated energy transfer.
