Judd–Ofelt parameters and multiphonon relaxation of Ho3+ ions in ZnCl2-based glass

Autor:	Kohei Kadono, M. Shojiya, Yoji Kawamoto
Rok vydání:	2001
Předmět:	chemistry.chemical_compound chemistry Excited state Analytical chemistry General Physics and Astronomy Relaxation (physics) Concentration quenching chemistry.chemical_element Holmium Fluoride Fluorescence Ion Line (formation)
Zdroj:	Journal of Applied Physics. 89:4944-4950
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1337586
Popis:	Spectroscopic properties of Ho3+-doped ZnCl2-based glasses are investigated. The Ω2 value of the glass is especially large compared with those in fluoride glasses while the Ω4 and Ω6 parameters are relatively small. Decay measurements for three excited states 5F5, 5S2+5F4, and 5F2,3+3K8 were performed and multiphonon relaxation (MPR) rates of the respective states were estimated. The experimental data are approximately on a line expressed by WMPR=C exp(−αΔE) with C=5.0×107 s−1 and α=4.0×10−3 cm. The host-dependent constant C is very small, contributing to high quantum efficiencies of emissions. The Ho3+ concentration dependence of the fluorescence lifetime of the 5F5 and 5S2+5F4 levels was also investigated. The concentration quenching of the 5S2+5F4 level can be explained by the cross-relaxation mechanism: 5S2→5I4 and 5I7←5I8 transitions.
Databáze:	OpenAIRE
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