Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10633537 | Optical Materials | 2005 | 7 Pages |
Abstract
Energy transfer process in soda-lime glasses co-doped with Gd3+ and Eu3+, where a ground state of Gd3+, 8S7/2, was selectively excited to a 6IJ state by a 275-nm pulsed laser irradiation, was studied based on a time-resolved luminescence spectroscopy. The luminescence decay rate at 313 nm (Gd3+: 6P7/2 â 8S7/2) was observed to be (1.5 ± 0.2) Ã 102 sâ1 (Ï = 6.6 ± 0.6 ms) without Eu3+ and to increase monotonously with increasing co-doped Eu3+ concentration, giving an apparent quenching rate constant of (5.0 ± 0.5) Ã 10â18 ionâ1 cm3 sâ1 (â(1.9 ± 0.2) Ã 103 mol%â1 sâ1) for a 6P7/2 state of Gd3+ ion with Eu3+. The relaxation rate of a 6IJ state to a luminescent state 6P7/2 in Gd3+ ion was estimated to be (1.8 ± 0.2) Ã 106 sâ1 from the rise rate at 313-nm luminescence (Ïrise â 0.56 μs), which was observed to be almost independent of the Eu3+ concentration. The luminescence intensity from Eu3+ at 591 nm and 613 nm monotonously increased with increasing Eu3+ concentration up to 0.33-mol% Eu3+, while it started decreasing at concentration of Eu3+ higher than 0.33-mol%, which was interpreted in terms of the resonant energy transfer to nearby Eu3+ resulting in the excitation to the Eu3+-Oâ charge transfer states.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yasutaka Kondo, Katsuhisa Tanaka, Rikuo Ota, Tomoki Fujii, Yo-ichi Ishikawa,