Synthesis and characterization of LiLuF4:Er3+ and LiLuF4:Yb3+,Er3+ exhibiting upconversion fluorescence pumped by a 1560 nm laser

摘要

Er3+ (10%) and Yb3+/Er3+ (10%/10%) doped tetragonal LiLuF4 microcrystals were synthesized via a hydrothermal method. The upconversion (UC) luminescence of LiLuF4:Yb3+,Er3+ and LiLuF4:Er3+ microcrystals is studied under 1560 nm pulsed laser excitation. The UC luminescence spectra indicated that LiLuF4 with doped rare earth ions achieved emissions that come from 2-4 photon UC processes. In the Yb3+/Er3+ doped LiLuF4, the UC fluorescence shows enhanced emission of Er3+ ions in the infrared range of about 1 mu m under 1560 nm laser excitation. The UC population processes of Er3+ and the energy transfer (ET) mechanism between Er3+ and Yb3+ played important roles in the as-prepared samples.