Abstract

Photobleaching of IR luminescence of BAC-Al at 1180 nm under various irradiation wavelengths (532, 633, 710, 830, and 980 nm) is observed for the first time, to the best of our knowledge. It is found that the bleaching rate increases along with the increasing photon energy. The photobleaching of BAC-Al at 532 nm irradiation is described as a two-photon process, evidenced by the quadratic dependence of the bleaching rate on the launched power. The photoinduced reduction on absorption bands of BAC-Al (700 nm) and BAC-Si (816 nm) is observed, revealing the higher stability for BAC-Al to laser irradiation. The thermal annealing effect on the bleached BAC-Al is also investigated; strong luminescence quenching of BAC-Al at the high temperature (500°C) is shown instead of the recovery. The underlying mechanism for photobleaching and thermal quenching of BAC-Al is analyzed and discussed.

© 2018 Optical Society of America

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