Low Threshold Two-Photon-Pumped Amplified Spontaneous Emission in CH3NH3PbBr3 Microdisks

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• 作者：Bin Yang ; Xin Mao ; Songqiu Yang ; Yajuan Li ; Yanqiu Wang ; Meishan Wang ; Weiqiao Deng ; Keli Han
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：8
• 期：30
• 页码：19587-19592
• 全文大小：463K
• 年卷期：0
• ISSN：1944-8252

文摘

Two-photon-pumped amplified spontaneous emission (ASE) of CH<sub>3sub>NH<sub>3sub>PbBr<sub>3sub> microdisks (MDs) were investigated by using femtosecond laser system. Low threshold at 2.2 mJ cm<sup>–2sup> was obtained. Also, emission spectral tunability from 500 to 570 nm was demonstrated by synthesis the mixed halide perovskite MDs. The spatial effect of photoluminescence (PL) properties under one-photon and two-photon excitation were also studied by means of two-photon laser scanning microscope (TPLSM) and time-resolved PL spectroscopy. It was found that the band to band emission of near-surface regions and photocarriers’ diffusion from near-surface regions to interior regions is significant for one-photon excitation. By contrast, reabsorption of emission under two-photon excitation plays a major role in the emission properties of the MDs. These results will give a more comprehensive understanding of the nonlinear effect of CH<sub>3sub>NH<sub>3sub>PbBr<sub>3sub> single crystals.