Nanowire Lasers of Formamidinium Lead Halide Perovskites and Their Stabilized Alloys with Improved Stability

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• 作者：Yongping Fu ; Haiming Zhu ; Alex W. Schrader ; Dong Liang ; Qi Ding ; Prakriti Joshi ; Leekyoung Hwang ; X-Y. Zhu ; Song Jin
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：16
• 期：2
• 页码：1000-1008
• 全文大小：632K
• ISSN：1530-6992

文摘

The excellent intrinsic optoelectronic properties of methylammonium lead halide perovskites (MAPbX₃, X = Br, I), such as high photoluminescence quantum efficiency, long carrier lifetime, and high gain coupled with the facile solution growth of nanowires make them promising new materials for ultralow-threshold nanowire lasers. However, their photo and thermal stabilities need to be improved for practical applications. Herein, we report a low-temperature solution growth of single crystal nanowires of formamidinium lead halide perovskites (FAPbX₃) that feature red-shifted emission and better thermal stability compared to MAPbX₃. We demonstrate optically pumped room-temperature near-infrared (～820 nm) and green lasing (～560 nm) from FAPbI₃ (and MABr-stabilized FAPbI₃) and FAPbBr₃ nanowires with low lasing thresholds of several microjoules per square centimeter and high quality factors of about 1500–2300. More remarkably, the FAPbI₃ and MABr-stabilized FAPbI₃ nanowires display durable room-temperature lasing under ～10⁸ shots of sustained illumination of 402 nm pulsed laser excitation (150 fs, 250 kHz), substantially exceeding the stability of MAPbI₃ (～10⁷ laser shots). We further demonstrate tunable nanowire lasers in wider wavelength region from FA-based lead halide perovskite alloys (FA,MA)PbI₃ and (FA,MA)Pb(I,Br)₃ through cation and anion substitutions. The results suggest that formamidinium lead halide perovskite nanostructures could be more promising and stable materials for the development of light-emitting diodes and continuous-wave lasers.