Energy transfer and cross-relaxation induced multicolor upconversion emissions in Er³⁺/Tm³⁺/Yb³⁺ doped double perovskite La₂ZnTiO₆ phosphors

Youfusheng Wu¹，Fengqin Lai¹，Bin Liu¹，Zhibiao Li¹，Tongxiang Liang¹，Yaochun Qiang¹，Jianhui Huang¹，Xinyu Ye^2,3，Weixiong You^1,2

1. School of Material Science and Engineering,Jiangxi University of Science and Technology2. Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province3. School of Metallurgy and Chemistry Engineering,Jiangxi University of Science and Technology

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 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 H_11/2/⁴S_3/2) 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 K^1- at 448 K.All these results imply that this kind of UC material has potential applications in display,bioimaging and optical device.

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