Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1531494 | Materials Science and Engineering: B | 2007 | 6 Pages |
Abstract
Stimulated emission from microcrystalline CsPbBr3 films is measured under several excitation/detection geometries including the measurements of optical gain. Threshold for stimulated emission is strongly dependent on the geometries. In particular, in the stripe-shape excitation geometry, the edge luminescence is, unlike the case for the simultaneously measured surface luminescence, solely composed of stimulated emission even for a very low excitation fluence of a few kW/cm2, suggesting a very low threshold for the stimulated emission. The net optical gain at 77 K amounted to 130 cm−1 at 32 kW/cm2 excitation fluence and increased up to 300 cm−1 at 210 kW/cm2.
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Authors
S. Kondo, T. Saito, H. Asada, H. Nakagawa,