期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 21, 期 23, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/23/235603
关键词
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资金
- Polish Ministry of Science and Higher Educations
- European Social Fund
- National Research Foundation of Korea [핵06B2812] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We investigated the single crystals of LiBaF3 doped with Eu2+ using high pressure spectroscopy, where high pressure was applied in a diamond anvil cell. Photoluminescence, time-resolved luminescence and luminescence kinetics at pressures from ambient to 200 kbar and at temperatures from 10 K to ambient were studied. At ambient conditions the luminescence spectra consisted of sharp lines peaked at 360 nm attributed to the P-6(7/2) --> S-8(7/2) transitions in the 4f(7) electronic configuration of Eu2+ (the zero-phonon line and five single-phonon repetitions) and a broad band extending between 375 and 475 nm attributed to Eu2+ trapped exciton recombination. When pressure was increased the Eu2+ trapped exciton emission disappears and was replaced by the sharper band peaked at 355 nm, attributed to the 4f(6)5d(1)(eg). 4f(7)(S-8(7/2)) transition in Eu2+. To analyze the pressure dependence of luminescence spectra a model of impurity trapped excitons was developed. At temperatures lower than 50 K only the sharp lines related to P-6(7/2) --> S-8(7/2) transitions were observed for all pressures considered. Analysis of low temperature spectra allowed us to estimate the energies of the fifth phonon modes and the values of the Gruneisen parameters.
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