Currently,the development of excellent red phosphor materials has attracted much attention in daily lighting,backlit displays,optical thermometry sensors and plant growthfields.However,spectral peak position modulatio...Currently,the development of excellent red phosphor materials has attracted much attention in daily lighting,backlit displays,optical thermometry sensors and plant growthfields.However,spectral peak position modulation and bandwidth are still crucial challenges.Herein,we design Eu^(3+)→Mn^(4+)energy transfer in the Lu_(3)Al_(5)O_(12)(LuAG)garnet host.On the one hand,photoluminescence tuning from narrow orangish-red emission(593 nm)to narrow deep-red light(668 nm)is successfully obtained,and the energy transfer effciency reaches 47%.On the other hand,LuAG:Eu^(3+)exhibits anti-thermal-quenching properties;that is,the peak intensity reaches 166%at 200℃of the initial intensity at 25℃.By designing Eu^(3+)→Mn^(4+)energy transfer,Mn^(4+)thermal quenching performance is dramatically improved.The photo luminescence peak intensities at 668 nm for LuAG:0.01Mn^(4+)and LuAG:0.05Eu^(3+),0.01Mn^(4+)retain 3.26%and 26%at 200℃of the original intensity at 25℃.The corresponding energy transfer mechanism to improve thermal quenching is revealed.According to thefluorescence intensity ratio technique,the maximum values of Sa and Sr for LuAG:0.05Eu^(3+),0.01Mn^(4+)are 0.07 K−1 and 0.7%K^(−1)at 303 K.The temp erature sensitivity calculation indicates that LuAG:Eu^(3+),Mn^(4+)phosphors can act as promising candidates in optical thermometry sensors.This work provides an insight to achieve narrow red emission modulation and thermal quenching improvement.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52072349,51672259 and 41807201)the Fundamental Research Funds for National Universities,China University of Geosciences(Wuhan)(No.1910491T02)the National College Students’Innovative Training Program(No.201910491003,201910491082,202010491002,202010491020 and 202010491053).
文摘Currently,the development of excellent red phosphor materials has attracted much attention in daily lighting,backlit displays,optical thermometry sensors and plant growthfields.However,spectral peak position modulation and bandwidth are still crucial challenges.Herein,we design Eu^(3+)→Mn^(4+)energy transfer in the Lu_(3)Al_(5)O_(12)(LuAG)garnet host.On the one hand,photoluminescence tuning from narrow orangish-red emission(593 nm)to narrow deep-red light(668 nm)is successfully obtained,and the energy transfer effciency reaches 47%.On the other hand,LuAG:Eu^(3+)exhibits anti-thermal-quenching properties;that is,the peak intensity reaches 166%at 200℃of the initial intensity at 25℃.By designing Eu^(3+)→Mn^(4+)energy transfer,Mn^(4+)thermal quenching performance is dramatically improved.The photo luminescence peak intensities at 668 nm for LuAG:0.01Mn^(4+)and LuAG:0.05Eu^(3+),0.01Mn^(4+)retain 3.26%and 26%at 200℃of the original intensity at 25℃.The corresponding energy transfer mechanism to improve thermal quenching is revealed.According to thefluorescence intensity ratio technique,the maximum values of Sa and Sr for LuAG:0.05Eu^(3+),0.01Mn^(4+)are 0.07 K−1 and 0.7%K^(−1)at 303 K.The temp erature sensitivity calculation indicates that LuAG:Eu^(3+),Mn^(4+)phosphors can act as promising candidates in optical thermometry sensors.This work provides an insight to achieve narrow red emission modulation and thermal quenching improvement.
