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Synthesis and NIR-to-violet, blue, green, red upconversion fluorescence of Er3+:LaOBr

2005; Elsevier BV; Volume: 397; Issue: 1-2 Linguagem: Inglês

10.1016/j.jallcom.2004.09.077

1873-4669

Dianyuan Wang, Yanyan Guo, Ende Zhang, Xingbing Chao, L. S. Yu, Jianglong Luo, Weiping Zhang, Min Yin,

Glass properties and applications

Abstract The Er 3+ :LaOBr powder were synthesized by a new NH 4 Br solid-state reaction, and the structures were studied using XRD and Raman methods. Under 785 nm laser excitation, the upconversion fluorescence spectra in Er 3+ :LaOBr were recorded and investigated. Four upconverted emission bands centered at about 406 nm (violet), 477 nm (blue), 542 nm (green) and 664 nm (red) were observed. All these upconverted emissions were assigned, and the dominant mechanism was deduced to be excited state absorption. The detailed study of the upconversion processes and the low phonon energy indicate that Er 3+ :LaOBr would be promising violet and visible upconversion laser materials.