Near-infrared(NIR)light devices have great potential in non-destructive testing and biomedicine fields.However,the lack of stable and efficient long wavelength NIR phosphors hinders their development.In this work,util...Near-infrared(NIR)light devices have great potential in non-destructive testing and biomedicine fields.However,the lack of stable and efficient long wavelength NIR phosphors hinders their development.In this work,utilizing the compositional flexibility of antimonate double perovskites,we realized efficient and tunable broadband NIR emissions based on A_(2)MSbO_(6):Cr^(3+)materials(A=Ca,Sr,and Ba;M=Ga,In,Sc,and Y).The NIR emission peaks ranged from 825 to 1010 nm by a composition modulation.In particular,Ca_(2)ScSbO_(6):Cr^(3+)exhibits an 850 nm-centering broadband NIR emission with an internal quantum efficiency of 84.5%and a high thermal quenching temperature,retaining-71%at 410 K of the initial inten-sity at 80 K.Comparatively,Sr_(2)InSbO_(6):Cr^(3+)with a 920 nm-centering broadband emission has 63.2%internal quantum efficiency.This work could help in discovering novel NIR phosphors with long-wave-length emissions and high efficiency.展开更多
Discovering new materials with desirable band gap and gap state is a central task in the semiconductor community,primarily relying on composition modulation.In this work,by employing atomic simulations,using transitio...Discovering new materials with desirable band gap and gap state is a central task in the semiconductor community,primarily relying on composition modulation.In this work,by employing atomic simulations,using transition-metal dichalcogenide Re_(0.5)Nb_(0.5)(S_(0.5)X_(0.5))_(2)(X=Se,Te)monolayer as an example,we present an alternative avenue for gap state engineering via leveraging diverse chemical short-range orders(SROs).It is found the electronic state contributed by the SRO motif tends to be occupied and may merge with the valence band,yielding a clean band gap in these multicomponent systems.On the contrary,the energy unfavorable local configurations,can produce localized states.The chemical environment in the chalcogen sublattice which has negligible influence on the band gap size can further fine-tune the gap states.The strong coupling of multiple short-range orders and gap states revealed in our work unlock the potential application of a vast family of multicomponent semiconductors.展开更多
基金supported by the National Natural Science Foundation of China(no.51972020 and no.51832005).
文摘Near-infrared(NIR)light devices have great potential in non-destructive testing and biomedicine fields.However,the lack of stable and efficient long wavelength NIR phosphors hinders their development.In this work,utilizing the compositional flexibility of antimonate double perovskites,we realized efficient and tunable broadband NIR emissions based on A_(2)MSbO_(6):Cr^(3+)materials(A=Ca,Sr,and Ba;M=Ga,In,Sc,and Y).The NIR emission peaks ranged from 825 to 1010 nm by a composition modulation.In particular,Ca_(2)ScSbO_(6):Cr^(3+)exhibits an 850 nm-centering broadband NIR emission with an internal quantum efficiency of 84.5%and a high thermal quenching temperature,retaining-71%at 410 K of the initial inten-sity at 80 K.Comparatively,Sr_(2)InSbO_(6):Cr^(3+)with a 920 nm-centering broadband emission has 63.2%internal quantum efficiency.This work could help in discovering novel NIR phosphors with long-wave-length emissions and high efficiency.
基金supported by the National KeyR&D Program of China(2022ZD0117601)Beijing Natural Science Foundation(Z210018)National Natural Science Foundation of China(No.52173216).
文摘Discovering new materials with desirable band gap and gap state is a central task in the semiconductor community,primarily relying on composition modulation.In this work,by employing atomic simulations,using transition-metal dichalcogenide Re_(0.5)Nb_(0.5)(S_(0.5)X_(0.5))_(2)(X=Se,Te)monolayer as an example,we present an alternative avenue for gap state engineering via leveraging diverse chemical short-range orders(SROs).It is found the electronic state contributed by the SRO motif tends to be occupied and may merge with the valence band,yielding a clean band gap in these multicomponent systems.On the contrary,the energy unfavorable local configurations,can produce localized states.The chemical environment in the chalcogen sublattice which has negligible influence on the band gap size can further fine-tune the gap states.The strong coupling of multiple short-range orders and gap states revealed in our work unlock the potential application of a vast family of multicomponent semiconductors.
