Effects of chloride introduction on the optical properties and the upconversion emission with 980-nm excitation of Er3+ in ZBLAN fluoride glasses

K. Soga, M. Tsuda, S. Sakuragi, H. Inoue, S. Inoue, A. Makishima

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29 Citations (Scopus)

Abstract

Er-doped ZBLAN fluoride glasses and those containing chloride were prepared. The parameters of optical transitions were determined experimentally. By the introduction of chlorine as replacing NaF with NaCl up to 20 mol% NaCl, the Judd-Ofelt parameters, Ω2 and Ω4, were increased and the multiphonon-relaxation rate decreased. With these parameters inserted into the rate equations, they were numerically solved. The upconversion mechanisms of Er3+ with 980-nm excitation and the effects of chlorine in the samples on the upconversion processes were observed. The upconversion processes for both 550-nm and 660-nm emissions were found to be dominated by the resonant and the phonon-assisted energy transfers. The intensity ratio of the 660-nm emission to the 550-nm emission decreased with increasing NaCl content. This change of intensity ratio was due to the suppression of the phonon-assisted energy transfer by chlorine.

Original languageEnglish
Pages (from-to)272-281
Number of pages10
JournalJournal of Non-Crystalline Solids
Volume222
DOIs
Publication statusPublished - 2 Dec 1997
EventProceedings of the 1997 14th University Conference on Glass Science - Bethlehem, PA, USA
Duration: 17 Jun 199720 Jun 1997

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