Photoluminescence of Eu 2+ and Eu 3+ Centers in CaS:Eu,Na Phosphors

Photoluminescence and excitation spectra, luminescence decay curves, and time-resolved photoluminescence spectra are observed for CaS:Eu,Na powder phosphors at various temperatures between 10 and 297 K. The detailed spectra of the Eu 3+ center in CaS are observed for the first time. The emission lin...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1993-07, Vol.32 (7R), p.3135
Main Authors: Yamashita, Nobuhiko, Fukumoto, Shigeru, Ibuki, Sumiaki, Ohnishi, Hideomi
Format: Article
Language:English
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Summary:Photoluminescence and excitation spectra, luminescence decay curves, and time-resolved photoluminescence spectra are observed for CaS:Eu,Na powder phosphors at various temperatures between 10 and 297 K. The detailed spectra of the Eu 3+ center in CaS are observed for the first time. The emission lines due to the Eu 3+ center are classified into two groups originating from centers A and B. The A center is attributed to the isolated Eu 3+ center, whereas the B center, to the paired Eu 3+ -Eu 2+ center.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.32.3135