At present,with the increasing application needs of phosphor-converted white light-emitting diode(wLED),the synthetic efficiency and thermal stability of phosphor become urgent problems.Herein,this research reports a ...At present,with the increasing application needs of phosphor-converted white light-emitting diode(wLED),the synthetic efficiency and thermal stability of phosphor become urgent problems.Herein,this research reports a microwave-assisted fast synthesis approach to obtain a Sm^(3+)-activated borotellurate Na_(2)Y_(2)TeO_(4)(BO_(3))_(2)(NYTB)red phosphor with high crystallinity,excellent thermostability,and low chromaticity shift.For the NYTB-based phosphor,in contrast to the conventional solid-state synthesis,the microwave-assisted synthesis method involves lower synthesis temperature and shorter processing time.Additionally,the concentration quenching mechanism was determined.The w-LED device packaged with the studied phosphor exhibits a near-standard white light with proper CCT and high Ra parameters.展开更多
For noncontact optical thermometry,in contrast with fluorescence intensity ratio(FIR)technology,excitation intensity ratio(EIR)technology has been seriously limited due to low sensitivity.Moreover,by exploring all pos...For noncontact optical thermometry,in contrast with fluorescence intensity ratio(FIR)technology,excitation intensity ratio(EIR)technology has been seriously limited due to low sensitivity.Moreover,by exploring all possible temperature-dependent response,developing multimode optical thermometry is of great importance.In this work,a new Na_(2)Y_(2)TeB_(2)O_(10):Tb^(3+)phosphor is obtained by a solid-state reaction.Based on FIR and EIR models of Tb',thermometric properties are studied thoroughly.Excellent relative and absolute sensitivity(S_(R)and S_(A))are acquired due to the significant difference in emission/excitation lines in response to temperature.Meanwhile,Tb^(3+)content-dependent luminescence quenching mechanism is discussed.This study shows a feasible route for exploiting well-performing FIR-/EIR-based thermometric materials.展开更多
基金Project supported by the National Natural Science Foundation of China(22165031,21761034)NationalUndergraduate Innovation and Entrepreneurship Foundation(202210673034)Scientific Research Foundation of Education Departmentof Yunnan province(2022Y001)。
文摘At present,with the increasing application needs of phosphor-converted white light-emitting diode(wLED),the synthetic efficiency and thermal stability of phosphor become urgent problems.Herein,this research reports a microwave-assisted fast synthesis approach to obtain a Sm^(3+)-activated borotellurate Na_(2)Y_(2)TeO_(4)(BO_(3))_(2)(NYTB)red phosphor with high crystallinity,excellent thermostability,and low chromaticity shift.For the NYTB-based phosphor,in contrast to the conventional solid-state synthesis,the microwave-assisted synthesis method involves lower synthesis temperature and shorter processing time.Additionally,the concentration quenching mechanism was determined.The w-LED device packaged with the studied phosphor exhibits a near-standard white light with proper CCT and high Ra parameters.
基金supported by the National Natural Science Foundation of China(No.22165031)National Undergraduate Innovation and Entrepreneurship Foundation(Nos.202210673034 and 202210673052)Program for Excellent Young Talents,Yunnan University.
文摘For noncontact optical thermometry,in contrast with fluorescence intensity ratio(FIR)technology,excitation intensity ratio(EIR)technology has been seriously limited due to low sensitivity.Moreover,by exploring all possible temperature-dependent response,developing multimode optical thermometry is of great importance.In this work,a new Na_(2)Y_(2)TeB_(2)O_(10):Tb^(3+)phosphor is obtained by a solid-state reaction.Based on FIR and EIR models of Tb',thermometric properties are studied thoroughly.Excellent relative and absolute sensitivity(S_(R)and S_(A))are acquired due to the significant difference in emission/excitation lines in response to temperature.Meanwhile,Tb^(3+)content-dependent luminescence quenching mechanism is discussed.This study shows a feasible route for exploiting well-performing FIR-/EIR-based thermometric materials.
