Room temperature two-photon-pumped random lasers in FAPbBr(3)/polyethylene oxide (PEO) composite perovskite thin film.
Room temperature two-photon-pumped random lasers in FAPbBr(3)/polyethylene oxide (PEO) composite perovskite thin film.
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FAPbBr3/聚环氧乙烷（PEO）复合钙钛矿薄膜中的室温双光子泵浦随机激光器
DOI：
10.1039/c8ra07452f
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发表时间：
2018-10-26
期刊：
影响因子：
3.9
通讯作者：
Chen, Ping
中科院分区：
文献类型：
--
作者：
Xu, Long;Meng, Yan;Xu, Caixia;Chen, Ping
溶液法制备的有机-无机卤化铅钙钛矿因其在低成本、高效、多功能的发光应用和大规模便携式光电子器件方面的巨大潜力而受到越来越多的关注。本文采用溶液法制备了聚氧化乙烯(PEO)复合的甲酰胺三溴化铅钙钛矿薄膜。在激发波长为1064 nm的纳秒脉冲激光泵浦下，可以在室温下实现双光子泵浦的随机激光作用。通过监测半高处的对数对数光发射斜率和峰宽，研究了自发上转换发射到随机激光作用的明显转变。激光阈值约为1.1mJ cm−2，与其他双光子上转换随机激光器的阈值相当。有效的随机激光发射源于微米级粗糙的形貌和多晶晶界提供的多重随机散射。与通常用作相干光源的传统激光器相比，钙钛矿型随机激光器在制造用于柔性和无斑点成像应用的低成本薄膜激光设备方面显示出很好的前景。溶液法制备的有机-无机卤化铅钙钛矿因其在低成本、高效、多功能的发光应用和大规模便携式光电子器件方面的巨大潜力而受到越来越多的关注。
Solution-processed organic–inorganic halide lead perovskites have attracted increasing attention due to their great potential in low-cost, effective, and versatile light emission applications and large-scale portable optoelectronic devices. In this paper, formamidinium lead tribromide perovskite thin films composited with polyethylene oxide (PEO) were fabricated by a solution processing method. Great enhancement of photoluminescence was observed and more attractively, two-photon-pumped random lasing action could be achieved at room temperature when pumped by a nanosecond pulse laser with excitation wavelength centered at 1064 nm. Evident transition from spontaneous upconversion emission to random lasing action was investigated by monitoring the log–log light emission slope and peak width at half height. The lasing threshold is at around 1.1 mJ cm−2, which is comparable to that of other two-photon upconversion random lasers. The efficient random lasing emission originates from the multiple random scattering provided by the micrometer-scale rugged morphology and polycrystalline grain boundaries. Compared with conventional lasers that normally serve as a coherent light source, the perovskite random lasers show promise in fabricating low-cost thin-film lasing devices for flexible and speckle-free imaging applications. Solution-processed organic–inorganic halide lead perovskites have attracted increasing attention due to their great potential in low-cost, effective, and versatile light emission applications and large-scale portable optoelectronic devices.
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