A novel orange-yellow-emitting Ba_(3)Y_(4)O_(9):Bi^(3+)phosphor(550 nm)has been firstly discovered.Meanwhile,we report isomorphic Ba3Lu4O_(9):Bi^(3+)with green emission(526 nm).Based on the cation substitution strateg...A novel orange-yellow-emitting Ba_(3)Y_(4)O_(9):Bi^(3+)phosphor(550 nm)has been firstly discovered.Meanwhile,we report isomorphic Ba3Lu4O_(9):Bi^(3+)with green emission(526 nm).Based on the cation substitution strategy,a series of Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4)solid solution phases are successfully constructed,realizing consecutive photoluminescence control from orange-yellow to green light.The occurrence of site migration of Bi^(3+)ions from Y2/Lu2 and Y4/Lu4 to Y1/Lu1 and Y3/Lu3 sites results in the blueshift of Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4),which is confirmed by the linear increase of PL intensity I_((1+3))/I_((2+4))with the substitution of Lu^(3+)ions for Y^(3+)ions.Besides,the improved thermal stability of Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4)with the substitution of Lu^(3+)for Y^(3+)originates from the better structure rigidity.The fabricated white light-emitting diodes(WLEDs)exhibit excellent warm white light,indicating that the as-prepared Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4)phosphors can act as a green to yellow emitting component in WLED lighting.展开更多
Polyoxometalates(POMs)have been considered as an efficient catalyst for triiodide reduction in dye-sensitized solar cells(DSSCs).However,agglomeration of POMs limits the improvement in power conversion efficiency(PCE)...Polyoxometalates(POMs)have been considered as an efficient catalyst for triiodide reduction in dye-sensitized solar cells(DSSCs).However,agglomeration of POMs limits the improvement in power conversion efficiency(PCE)of DSSCs.In this paper,we improve our previous synthesis process by a simple ultrasonic driving strategy.A series of highly dispersed POM nanoparticles periodically deposited on multi-walled carbon nanotube(MWCNT)nanocomposites(abbreviated as POMs/CNTs)is synthesized,which increases the active sites by improving the dispersion degree and inhibiting the aggregation of POM molecules.Additionally,CNTs as a conductive support skeleton and physical barrier promote the rapid electron transfer and protect POM molecules from chemical degradation.The nanocomposites exhibit well-distributed morphology,and highly dispersed POM nanoparticles about tens of nanometers in diameter are in intimate contact with CNTs.Powder X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy and transmission electron microscopy demonstrate that POM nanoparticles have been periodically deposited on CNTs.POM/CNT counterelectrodes(CEs)exhibit a more remarkable performance towards triiodide reduction than pure CNT CEs,indicating that POMs deposited on CNTs boost electrocatalytic triiodide reduction.Among these POM/CNT CEs,the Co4PW9/CNT CE exhibits the best photovoltaic behavior with a high power conversion efficiency(PCE)of 7.60%,which is superior to that of the Pt CE(6.59%).The excellent activity originates from the synergistic effect between the high redox activity of POMs and the excellent conductive ability of CNTs.This work provides a foundation for preparing advanced high-efficient CE catalysts of POM materials.展开更多
By employing a mixed metal synthesis strategy,a heterometallic MOF,[In_(3)Tb_(3)O_(3)(TATAB)_(4)(H_(2)O)_(6)]·12DMF·12H_(2)O(1),has been constructed based on a nitrogen-rich ligand 4,4',4''-s-tri...By employing a mixed metal synthesis strategy,a heterometallic MOF,[In_(3)Tb_(3)O_(3)(TATAB)_(4)(H_(2)O)_(6)]·12DMF·12H_(2)O(1),has been constructed based on a nitrogen-rich ligand 4,4',4''-s-triazine-1,3,5-triyltri-p-aminobenzoic(H_(3)TATAB).Compound 1 shows a 3D doubly interpenetrated framework built from dual-walled cages of dimension ca.2.8 nm.In particular,the framework of 1 possesses a high density of Lewis acidic metal ions and Lewis basic-NH-sites decorated on the pore walls.Fluorescent sensor study indicates that 1 can maintain its stability and agility after several cycles of detecting nitenpyram,and the detection limit of 1 for nitenpyram is as low as 0.17μg mL^(-1).展开更多
基金supported by the National Natural Science Foundation of China(Grant No 51672259,51720105015,51672265,51932009,51929201,51750110511)the Key Research Program of Frontier Sciences of CAS(YZDY-SSWJSC018)+3 种基金the CAS-Croucher Funding Scheme for Joint Laboratories(CAS18204)Science and Technology Cooperation Project between Chinese and Australian Governments(2017YFE0132300)Jiangmen Innovative Research Team Program(2017)the Major program of basic research and applied research of Guangdong Province(2017KZDXM083).
文摘A novel orange-yellow-emitting Ba_(3)Y_(4)O_(9):Bi^(3+)phosphor(550 nm)has been firstly discovered.Meanwhile,we report isomorphic Ba3Lu4O_(9):Bi^(3+)with green emission(526 nm).Based on the cation substitution strategy,a series of Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4)solid solution phases are successfully constructed,realizing consecutive photoluminescence control from orange-yellow to green light.The occurrence of site migration of Bi^(3+)ions from Y2/Lu2 and Y4/Lu4 to Y1/Lu1 and Y3/Lu3 sites results in the blueshift of Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4),which is confirmed by the linear increase of PL intensity I_((1+3))/I_((2+4))with the substitution of Lu^(3+)ions for Y^(3+)ions.Besides,the improved thermal stability of Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4)with the substitution of Lu^(3+)for Y^(3+)originates from the better structure rigidity.The fabricated white light-emitting diodes(WLEDs)exhibit excellent warm white light,indicating that the as-prepared Ba_(3)Y_(4)-wLuwO_(9):Bi^(3+)(0≤w≤4)phosphors can act as a green to yellow emitting component in WLED lighting.
基金financially supported by the National Natural Science Foundation of China(No.21871041 and 21801038)the Natural Science Foundation of Jilin Province(No.20180101298JC)+3 种基金the China Postdoctoral Science Foundation funded project(No.2019T120227)the Technology Foundation for Selected Overseas Chinese Scholars of Personnel Ministry of ChinaScience and Technology Activities Project Preferential Funding for Selected Overseas Chinese Scholars of Jilin Province Human Resources and Social BureauHigh Tech Industry Innovation Project of Changchun Northeast Normal University Science and Technology Development Center.
文摘Polyoxometalates(POMs)have been considered as an efficient catalyst for triiodide reduction in dye-sensitized solar cells(DSSCs).However,agglomeration of POMs limits the improvement in power conversion efficiency(PCE)of DSSCs.In this paper,we improve our previous synthesis process by a simple ultrasonic driving strategy.A series of highly dispersed POM nanoparticles periodically deposited on multi-walled carbon nanotube(MWCNT)nanocomposites(abbreviated as POMs/CNTs)is synthesized,which increases the active sites by improving the dispersion degree and inhibiting the aggregation of POM molecules.Additionally,CNTs as a conductive support skeleton and physical barrier promote the rapid electron transfer and protect POM molecules from chemical degradation.The nanocomposites exhibit well-distributed morphology,and highly dispersed POM nanoparticles about tens of nanometers in diameter are in intimate contact with CNTs.Powder X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy and transmission electron microscopy demonstrate that POM nanoparticles have been periodically deposited on CNTs.POM/CNT counterelectrodes(CEs)exhibit a more remarkable performance towards triiodide reduction than pure CNT CEs,indicating that POMs deposited on CNTs boost electrocatalytic triiodide reduction.Among these POM/CNT CEs,the Co4PW9/CNT CE exhibits the best photovoltaic behavior with a high power conversion efficiency(PCE)of 7.60%,which is superior to that of the Pt CE(6.59%).The excellent activity originates from the synergistic effect between the high redox activity of POMs and the excellent conductive ability of CNTs.This work provides a foundation for preparing advanced high-efficient CE catalysts of POM materials.
基金NSFC(21977083)Open Fund of State Key Laboratory of Bioorganic and Natural Products Chemistry(SKLBNPC19248)Young Scholar supporting grant from Northwest A&F University(2452019002)。
文摘By employing a mixed metal synthesis strategy,a heterometallic MOF,[In_(3)Tb_(3)O_(3)(TATAB)_(4)(H_(2)O)_(6)]·12DMF·12H_(2)O(1),has been constructed based on a nitrogen-rich ligand 4,4',4''-s-triazine-1,3,5-triyltri-p-aminobenzoic(H_(3)TATAB).Compound 1 shows a 3D doubly interpenetrated framework built from dual-walled cages of dimension ca.2.8 nm.In particular,the framework of 1 possesses a high density of Lewis acidic metal ions and Lewis basic-NH-sites decorated on the pore walls.Fluorescent sensor study indicates that 1 can maintain its stability and agility after several cycles of detecting nitenpyram,and the detection limit of 1 for nitenpyram is as low as 0.17μg mL^(-1).
