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Optical Properties of Er 3+ Ions in Calcium Niobium Gallium Garnet (CNGG) Crystals
Author(s) -
Tsuboi T.,
Shimamura K.,
Fukuda T.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199908)214:2<479::aid-pssb479>3.0.co;2-q
Subject(s) - luminescence , materials science , niobium , gallium , ion , crystal (programming language) , analytical chemistry (journal) , excitation , absorption (acoustics) , absorption spectroscopy , doping , photoluminescence , single crystal , optics , optoelectronics , chemistry , crystallography , physics , organic chemistry , chromatography , quantum mechanics , computer science , metallurgy , composite material , programming language
Single crystals of Er 3+ ‐doped calcium niobium gallium garnet (CNGG) were grown using the Czochralski technique, and the single crystal fibers with diameter of 0.81 mm were grown by the micro pulling‐down method. The absorption and luminescence spectra by Er 3+ ions in these materials have been investigated together with the luminescence decay. The same results are obtained between the crystals and fibers. Broad absorption lines are obtained which are suggested to be due to the Er 3+ ions with various site symmetries. By the excitation with 266 nm radiation, the luminescence bands are observed at 490, 535, 545, 554, 656 and 669 nm. The 545 nm luminescence due to the 4 S 3/2 → 4 I 15/2 transition is found to have two decay components: the fast decay component of 15.1 μs and the slow component of 30.5 μs. A delay time of 3.7 μs was found between the excitation pulse and the 656 and 669 nm luminescence bands due to the 4 F 9/2 → 4 I 15/2 transition while no delay was found for the other luminescence bands.