期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202102563
关键词
amplified spontaneous emission; antisolvent treatment; passivation; quasi-2D perovskites
资金
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB43000000]
- National Natural Science Foundation of China [61874106]
This research proposes an anti-solvent treatment strategy to regulate the phase components and surface morphology of quasi-2D perovskite films, and introduces an additional coating to reduce surface defects. Excellent amplified spontaneous emission and two-photon-pumped emission are achieved through these methods.
Solution-processed quasi-2D Ruddlesden-Popper perovskites are being considered as a promising optical gain medium in lasing applications, owing to their outstanding optoelectronic properties and inherent stability. However, the development of quasi-2D perovskites for lasers with low threshold and high optical gain is still lagging far behind 3D-perovskites. This work proposes an anti-solvent treatment strategy to regulate the phase components and surface morphology of quasi-2D PEA(2)(CsPbBr3)(n-1)PbBr4 thin films. Furthermore, an additional poly(methyl methacrylate) coating is introduced to reduce the surface defects of perovskite films and suppress the non-radiative recombination. Due to the phase engineering and surface passivation, excellent amplified spontaneous emission (ASE) is obtained with a low threshold of 11.7 mu J cm(-2) and a high net model gain of 622 cm(-1). In addition, under 800 nm femtosecond laser excitation, two-photon-pumped ASE is also successfully observed with a low threshold of 7.2 mJ cm(-2).
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