期刊
JOURNAL OF LUMINESCENCE
卷 128, 期 5-6, 页码 901-904出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2007.12.012
关键词
Tm : Sc2O3 and (Tm; Nd; Yb): Sc2O3 ceramics; energy transfer; upconversion
类别
The spectroscopic investigation of Tm3+ or (Nd, Yb, Tm)-doped Sc2O3 transparent ceramics, as laser-active media for visible and IR emission, was performed. The spectra are dominated by Tm3+ ions in sites of C-2 symmetry and an energy level scheme and other spectral parameters were determined. The strong concentration quenching of H-3(4) level emission in Tm:Sc2O3 at 300 K is discussed by considering the resonant cross-relaxation (H-3(4)-> F-3(4))-(H-3(6)-> F-3(4)) process and multipolar interactions of various orders. The main energy-transfer processes leading to the blue upconversion emission from the (1)G(4) Tm3+ level in (Tm, Nd, Yb):Sc2O3 ceramic, under pulsed pumping at 808.3 nm were evidenced. (c) 2008 Elsevier B.V. All rights reserved.
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