In this paper,the fracture surfaces of a light-conversion film were observed using a scanning electron microscope(SEM),and then,the fluorescence spectra and mechanical properties of the film were tested.The SEM result...In this paper,the fracture surfaces of a light-conversion film were observed using a scanning electron microscope(SEM),and then,the fluorescence spectra and mechanical properties of the film were tested.The SEM results show that the average diameter of the light conversion agent is 500 nm.The results of the mechanical properties tests show that the tensile strengths of light-conversion film increase from9.86 to 12.16 MPa and that the strain at breakage increases from 2.37%to 2.75%.In addition,the application effects of the light-co nversion film were studied.The results indicate that plant height,length of the maximum leaf,width of the maximum leaf and breadth of the plants increase by 24.43%,15.30%,15.60%and 19.07%,respectively.The quality of Chinese flowering cabbages treated with the lightconversion film is superior,including a 9.09%increase in the soluble protein content,a 21.27%increase in the polyphenol content,and a 19.15%increase in the soluble sugar content.Based on these results,light-conversion films can be applied in agricultural production.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
Efficient conversion and synergistic solar energy utilization are critical for advancing low-carbon and sustainable development.In this study,two Pt(Ⅱ)-based metal/halogen-bonded organic frameworks(MXOFBen and MXOF-A...Efficient conversion and synergistic solar energy utilization are critical for advancing low-carbon and sustainable development.In this study,two Pt(Ⅱ)-based metal/halogen-bonded organic frameworks(MXOFBen and MXOF-Anth)were designed to enhance photoconversion efficiency and enable multifunctional integration.The ligand L-terpyr is formed by coupling tripyridine with diphenylamine dipyridine,in which the tripyridine effectively acts as a metal-ligand to lower the band gap and promote nonradiative leaps,thereby enhancing the photoconversion ability.Meanwhile,diphenylamine dipyridine serves as a[N…I^(+)…N]halogen-bonding acceptor,imparting superhydrophilicity to the materials and increasing carrier density,further improving photocatalytic performance.Experimental results demonstrate that these two MXOFs achieve impressive interfacial water evaporation efficiencies of up to87.8%and 94.0%,respectively.Additionally,the materials exhibit excellent performance in photothermal power generation and photocatalysis of H_(2)O_(2).Notably,the MXOFs also deliver strong overall performance in integrated systems combining interfacial water evaporation with photothermal power generation or photocatalysis,underscoring their exceptional photoconversion efficiency and multifunctional potential.This work introduces a novel strategy by incorporating metal-ligand and halogen bonds,offering a pathway to enhance photoconversion efficiency and develop versatile materials for advanced solar energy applications,thereby fostering the progress of high-efficiency solar energy conversion and multifunctional organic materials.展开更多
The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The resu...The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu2+, the sharp emission peaks at 592, 616, 650 and 750 nm correspond to 5D0→7Fj（j=1-4） emission transition of Eu3+, respectively, which indicates that the BaO-La2O3-B2O3-Eu2O3 glass can convert ultraviolet and green components of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent intensity of Eu2+ increases with increasing the molar ratio of Tb3+ in BaO-La2O3-B2O3-Eu2O3-Tb4O7 glasses, whereas the luminescent intensity of Eu3+ decreases. So the luminescent intensity of Eu（III, II） is influenced by Tb3+. These phenomena can be explained by electron transfer mechanism: Eu3+（4f6）+Tb3+（4f8）→Eu2+（4f7）+Tb4+（4f7）. Taking advantage of the luminescent properties of BaO-La2O3-B2O3-Eu2O3 glasses, light-conversion glass for agriculture can be produced.展开更多
CaO-SiO2-B2O3 ：Sm2O3 glasses were synthesized in air atmosphere with conventional high temperature process. The optimal temperature of synthesis, the absorption spectrum and the luminescent properties of the glasses ...CaO-SiO2-B2O3 ：Sm2O3 glasses were synthesized in air atmosphere with conventional high temperature process. The optimal temperature of synthesis, the absorption spectrum and the luminescent properties of the glasses were studied. The fluorescence spectrum of Sm^3＋ was observed in CaO-SiO2-B2O3 ： Sm2O3 glasses. The fluorescence spectrum of the sample has three major emission bands peaking at 568, 605 and 650 nm respectively. The strongest emission band peak at 605 nm. It is concluded that the emissions were caused by the f-f transition of the 4f electrons of Sm^3＋. The emission bands peaking at 568, 604 and 650 nm correspond to the ^4G5/2→^6H5/2 transition, ^4G5/2→^6H7/2 transition and ^4G5/2→^6H9/2 trasition respectively. The luminescent properties of CaO-SiO2-B2O3 glasses indicate that the glass can convert the ultraviolet in the sunlight into red light, thus increasing the intensity of red light. The luminescent properties of these glasses may be used to make kinds of light-conversion glass for agriculture.展开更多
基金Project supported by the National Natural Science Foundation of China(21671070)Key Realm R&D Program of Guangdong Province(2019B020214001,2019B020223001)+2 种基金China Agriculture Research System(CARS-26)Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams(2019LM119)the National Undergraduate Innovation and Entrepreneurship Training Program granted for Gening Xie(201910564035)。
文摘In this paper,the fracture surfaces of a light-conversion film were observed using a scanning electron microscope(SEM),and then,the fluorescence spectra and mechanical properties of the film were tested.The SEM results show that the average diameter of the light conversion agent is 500 nm.The results of the mechanical properties tests show that the tensile strengths of light-conversion film increase from9.86 to 12.16 MPa and that the strain at breakage increases from 2.37%to 2.75%.In addition,the application effects of the light-co nversion film were studied.The results indicate that plant height,length of the maximum leaf,width of the maximum leaf and breadth of the plants increase by 24.43%,15.30%,15.60%and 19.07%,respectively.The quality of Chinese flowering cabbages treated with the lightconversion film is superior,including a 9.09%increase in the soluble protein content,a 21.27%increase in the polyphenol content,and a 19.15%increase in the soluble sugar content.Based on these results,light-conversion films can be applied in agricultural production.
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(Nos.22371218,21702153,52270070,and 21801194)the Wuhan Science and Technology Bureau(No.whkxjsj009)+1 种基金support of the Core Facility of Wuhan Universitythe Large-scale Instrument and Equipment Sharing Foundation of Wuhan University。
文摘Efficient conversion and synergistic solar energy utilization are critical for advancing low-carbon and sustainable development.In this study,two Pt(Ⅱ)-based metal/halogen-bonded organic frameworks(MXOFBen and MXOF-Anth)were designed to enhance photoconversion efficiency and enable multifunctional integration.The ligand L-terpyr is formed by coupling tripyridine with diphenylamine dipyridine,in which the tripyridine effectively acts as a metal-ligand to lower the band gap and promote nonradiative leaps,thereby enhancing the photoconversion ability.Meanwhile,diphenylamine dipyridine serves as a[N…I^(+)…N]halogen-bonding acceptor,imparting superhydrophilicity to the materials and increasing carrier density,further improving photocatalytic performance.Experimental results demonstrate that these two MXOFs achieve impressive interfacial water evaporation efficiencies of up to87.8%and 94.0%,respectively.Additionally,the materials exhibit excellent performance in photothermal power generation and photocatalysis of H_(2)O_(2).Notably,the MXOFs also deliver strong overall performance in integrated systems combining interfacial water evaporation with photothermal power generation or photocatalysis,underscoring their exceptional photoconversion efficiency and multifunctional potential.This work introduces a novel strategy by incorporating metal-ligand and halogen bonds,offering a pathway to enhance photoconversion efficiency and develop versatile materials for advanced solar energy applications,thereby fostering the progress of high-efficiency solar energy conversion and multifunctional organic materials.
文摘The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu2+, the sharp emission peaks at 592, 616, 650 and 750 nm correspond to 5D0→7Fj（j=1-4） emission transition of Eu3+, respectively, which indicates that the BaO-La2O3-B2O3-Eu2O3 glass can convert ultraviolet and green components of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent intensity of Eu2+ increases with increasing the molar ratio of Tb3+ in BaO-La2O3-B2O3-Eu2O3-Tb4O7 glasses, whereas the luminescent intensity of Eu3+ decreases. So the luminescent intensity of Eu（III, II） is influenced by Tb3+. These phenomena can be explained by electron transfer mechanism: Eu3+（4f6）+Tb3+（4f8）→Eu2+（4f7）+Tb4+（4f7）. Taking advantage of the luminescent properties of BaO-La2O3-B2O3-Eu2O3 glasses, light-conversion glass for agriculture can be produced.
文摘CaO-SiO2-B2O3 ：Sm2O3 glasses were synthesized in air atmosphere with conventional high temperature process. The optimal temperature of synthesis, the absorption spectrum and the luminescent properties of the glasses were studied. The fluorescence spectrum of Sm^3＋ was observed in CaO-SiO2-B2O3 ： Sm2O3 glasses. The fluorescence spectrum of the sample has three major emission bands peaking at 568, 605 and 650 nm respectively. The strongest emission band peak at 605 nm. It is concluded that the emissions were caused by the f-f transition of the 4f electrons of Sm^3＋. The emission bands peaking at 568, 604 and 650 nm correspond to the ^4G5/2→^6H5/2 transition, ^4G5/2→^6H7/2 transition and ^4G5/2→^6H9/2 trasition respectively. The luminescent properties of CaO-SiO2-B2O3 glasses indicate that the glass can convert the ultraviolet in the sunlight into red light, thus increasing the intensity of red light. The luminescent properties of these glasses may be used to make kinds of light-conversion glass for agriculture.
