期刊
NANO LETTERS
卷 16, 期 1, 页码 448-453出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04110
关键词
Perovskites; nanocrystals; nonlinear absorption; stimulated emission
类别
资金
- Singapore National Research Foundation [NRFCRP6-2010-02]
- Singapore Ministry of Education [MOE 2011-T3-1-005]
- Merlion [2.02.13]
- National Basic Research Program of China [2014CB931700]
Halide perovskite materials have attracted intense research interest due to the striking performance in photoharvesting photovoltaics as well as photoemitting applications. Very recently, the emerging CsPbX3 (X = Cl, Br, I) perovskite nanocrystals have been demonstrated to be efficient emitters with photoluminescence quantum yield as high as similar to 90%, room temperature single photon sources, and favorable lasing materials. Herein, the nonlinear optical properties, in particular, the multiphoton absorption and resultant photoluminescence of the CsPbBr3 nanocrystals, were investigated. Notably, a large two-photon absorption cross-section of up to similar to 1.2 x 10(5) GM is determined for 9 nm sized CsPbBr3 nanocrystals. Moreover, low-threshold frequency-upconverted stimulated emission by two-photon absorption was observed from the thin film of close-packed CsPbBr3 nanocrystals. The stimulated emission is found to be photostable and wavelength-tunable. We further realize the three-photon pumped stimulated emission in green spectra range from colloidal nanocrystals for the first time. Our results reveal the strong nonlinear absorption in the emerging CsPbX3 perovskite nanocrystals and suggest these nanocrystals as attractive multiphoton pumped optical gain media, which would offer new opportunities in nonlinear photonics and revive the nonlinear optical devices.
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