摘要
Investigation on the bright and stable upconversion(UC)phosphors with multicolor emissions is fundamental and significant for the frontier applications of display and tempe rature probe.He re,dive rse emitting colors with blue,cyan and yellowish green,which are caused by the energy transfer and crossrelaxation processes,are obtained by altering Er^3+,Tm^3+and Yb^3+concentrations in Er3+singly,Er^3+-Tm^3+-Yb^3+co-and tri-doped double perovskite La2ZnTiO6(LZT)phosphors synthesized by a simple solid-state reaction.In addition,excellent infrared emission at 801 nm located at"first biological windo w"is collected in Tm^3+-Yb^3+co-doped phosphors.Meanwhile,the temperature sensing properties based on the thermally coupled levels((^2H11/2)/(^4S3/2))of Er3+ions were analyzed from 298 to 573 K of LZT:0.15 Er^3+/0.10 Yb^3+phosphor,demonstrating that the maximal sensitivity value is about56×10^-4 K^-1 at 448 K.All these results imply that this kind of UC material has potential applications in display,bioimaging and optical device.
Investigation on the bright and stable upconversion（UC） phosphors with multicolor emissions is fundamental and significant for the frontier applications of display and tempe rature probe.He re,dive rse emitting colors with blue,cyan and yellowish green,which are caused by the energy transfer and crossrelaxation processes,are obtained by altering Er3+,Tm3+and Yb3+ concentrations in Er3+singly,Er3+-Tm3+-Yb3+co-and tri-doped double perovskite La2 ZnTiO6（LZT） phosphors synthesized by a simple solid-state reaction.In addition,excellent infrared emission at 801 nm located at "first biological windo w" is collected in Tm3+-Yb3+co-doped phosphors.Meanwhile,the temperature sensing properties based on the thermally coupled levels(2 H11/2/4S3/2) of Er3+ ions were analyzed from 298 to 573 K of LZT:0.15 Er3+/0.10 Yb3+phosphor,demonstrating that the maximal sensitivity value is about56×10-4 K1- at 448 K.All these results imply that this kind of UC material has potential applications in display,bioimaging and optical device.
基金
supported by the National Natural Science Foundation of China(11464017,11864015)
the Scientific Research Foundation for Universities from the Education Bureau of Jiangxi Province(GJJ170490)
Foundation of Natural Science Funds for Distinguished Young Scholar of Jiangxi Province(20171BCB23064)
the Science and Technology Major Project of Jiangxi Province(20165ABC28010).
