Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9586303 | Journal of Luminescence | 2005 | 8 Pages |
Abstract
The fluorescence intensity of divalent samarium (Sm2+) ions doped in alkaline-earth fluorohalides were found to decrease under the optical excitation from a blue laser, a green laser or even a red laser. This photobleaching effect has a mysterious and unknown mechanism. After the bleaching effect happened, no Sm3+ ions generation, no relative spectral change in Sm2+ emissions and no lifetime decrease for the levels of Sm2+ ions could be observed. Under blue- or green-laser irradiation, the decrease of Sm2+ fluorescence showed a perfect biexponential function; however, when the exciting photon energy was lower than that of 5D0â7F0 transition, the photobleaching effect could not be observed anymore. An identical mechanism in the photobleaching with that in the spectral hole burning was proposed.
Related Topics
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Authors
Weiping Qin, Kiwan Jang, Seongtae Park, Yong-ill Lee, Changdae Kim,