Near-infrared(NIR)spectroscopy has significantly advanced NIR light sources.However,creating NIR emitters with optimal luminescence properties,high thermal stability,and adjustable emission peaks poses a critical chal...Near-infrared(NIR)spectroscopy has significantly advanced NIR light sources.However,creating NIR emitters with optimal luminescence properties,high thermal stability,and adjustable emission peaks poses a critical challenge for future smart NIR devices.We introduced a chemical unit cosubstitution strategy by incorporating Ca^(2+) and Sn^(4+) ions into the garnet structure.Through this approach,Y_(3-y)Ca_(y)Ga_(4.95-y)Sn_(y)O_(12):0.05Cr^(3+)(y=0-1)phosphors were developed by modulating the A&C ligands,resulting in emission centers ranging from 708 to 768 nm.The modified local environment of Cr^(3+)accounts for the increased light intensity(2.71 times)and broadening observed.Furthermore,this study investigated the impact of varying Cr^(3+)concentrations(Y_(2.6)Ca_(0.4)Ga_(4.6-x)Sn_(0.4)O_(12):xCr^(3+))on the production of highperformance phosphors.Compared with Y_(3)Ga_(4.93)0_(12):0.07Cr^(3+),the optimized phosphor exhibited exceptional external quantum efficiency(EQE=34.96%).The luminescence enhancement is attributed to an increase in radiative transitions caused by octahedral Jahn-Teller distortion,whereas the notable thermal stability(91.3%at 423 K)is attributed to the presence of weak electron-phonon coupling(EPC)and oxygen vacancy(O_(v))defects.Finally,by combining it with a 450 nm blue LED chip,we constructed a near-infrared phosphorconverted LED(NIR pc-LED)device with superior electroluminescence efficiency(18.8%@100 mA),increasing the ultralow quenching rate(<5%intensity loss after 30 days of operation)and demonstrating remarkable performance in plant lighting applications.展开更多
基金supported by the National Natural Science Foundation of China (12274144, 52472161, and 22361132525)the Guangdong Provincial Science and Technology Project (2022A1515010229)the Russian Science Foundation (24-43-00006)。
文摘Near-infrared(NIR)spectroscopy has significantly advanced NIR light sources.However,creating NIR emitters with optimal luminescence properties,high thermal stability,and adjustable emission peaks poses a critical challenge for future smart NIR devices.We introduced a chemical unit cosubstitution strategy by incorporating Ca^(2+) and Sn^(4+) ions into the garnet structure.Through this approach,Y_(3-y)Ca_(y)Ga_(4.95-y)Sn_(y)O_(12):0.05Cr^(3+)(y=0-1)phosphors were developed by modulating the A&C ligands,resulting in emission centers ranging from 708 to 768 nm.The modified local environment of Cr^(3+)accounts for the increased light intensity(2.71 times)and broadening observed.Furthermore,this study investigated the impact of varying Cr^(3+)concentrations(Y_(2.6)Ca_(0.4)Ga_(4.6-x)Sn_(0.4)O_(12):xCr^(3+))on the production of highperformance phosphors.Compared with Y_(3)Ga_(4.93)0_(12):0.07Cr^(3+),the optimized phosphor exhibited exceptional external quantum efficiency(EQE=34.96%).The luminescence enhancement is attributed to an increase in radiative transitions caused by octahedral Jahn-Teller distortion,whereas the notable thermal stability(91.3%at 423 K)is attributed to the presence of weak electron-phonon coupling(EPC)and oxygen vacancy(O_(v))defects.Finally,by combining it with a 450 nm blue LED chip,we constructed a near-infrared phosphorconverted LED(NIR pc-LED)device with superior electroluminescence efficiency(18.8%@100 mA),increasing the ultralow quenching rate(<5%intensity loss after 30 days of operation)and demonstrating remarkable performance in plant lighting applications.
