Amplified Spontaneous Emission and Random Lasing in MAPbBr3 Halide Perovskite Single Crystals,Advanced Optical Materials

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Amplified Spontaneous Emission and Random Lasing in MAPbBr3 Halide Perovskite Single Crystals
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-06-08 , DOI: 10.1002/adom.202000690
Aleksei O. Murzin ₁ , Boris V. Stroganov ₁ , Carsten Günnemann ₂ , Samia Ben Hammouda ₂ , Anna V. Shurukhina ₁ , Maxim S. Lozhkin ₁ , Alexei V. Emeline ₁ , Yury V. Kapitonov ₁

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Halide perovskites are a promising optical gain medium with high tunability and simple solution synthesis. In this study, two gain regimes, namely, amplified spontaneous emission and random lasing, are demonstrated in the same MAPbBr₃ halide perovskite single crystal. For this, photoluminescence is measured at a temperature of 4 K with pulsed femtosecond pumping by UV light with an 80 MHz repetition rate. Random lasing is observed in areas of the sample where a random resonator is formed due to cracks and crystal imperfections. In more homogeneous regions of the sample, the dominant regime is amplified spontaneous emission. These two regimes are reliably distinguished by the line width, the mode structure, the growth of the intensity after the threshold, and the degree of polarization of the radiation. The spectral localization of the stimulated emission well below the bound exciton resonance raises a question concerning the origin of the emission in halide perovskite lasers.

中文翻译：

MAPbBr3卤化物钙钛矿单晶中的自发发射和随机激射

卤化物钙钛矿是一种有前途的光学增益介质，具有高可调性和简单的溶液合成方法。在这项研究中，在同一MAPbBr ₃中证明了两种增益机制，即放大的自发发射和随机激射卤化物钙钛矿单晶。为此，在4 K的温度下，通过以80 MHz重复频率的紫外光通过飞秒脉冲泵浦来测量光致发光。在由于裂纹和晶体缺陷而形成随机谐振器的样品区域中观察到随机激射。在样品的更均匀区域中，主要机制是放大的自发发射。通过线宽，模式结构，阈值后强度的增长以及辐射的偏振度，可以可靠地区分这两种情况。在受激激子共振以下的受激发射的光谱局部性提出了一个有关卤化物钙钛矿激光器发射源的问题。

更新日期：2020-06-08

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