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Ultrahigh photo-stable all-inorganic perovskite nanocrystals and their robust random lasing
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020/01/15 , DOI: 10.1039/c9na00775j
Liuli Yang 1 , Ting Wang 1 , Qiuhong Min 1 , Chaojie Pi 1 , Fan Li 2 , Xiao Yang 2 , Kongzhai Li 3 , Dacheng Zhou 1 , Jianbei Qiu 1 , Xue Yu 1 , Xuhui Xu 1
Affiliation  

Photo-instability has prevented further commercialization of all-inorganic perovskite nanocrystals (NCs) in the field of high-power optoelectronics. Here, an accelerated transformation process from non-luminescent Cs4PbBr6 to CsPbBr3 NCs with bright green emission is explored with irradiation at 365 nm during water-triggered structural transformation. The photoelectric field provided by the photon energy of 365 nm promotes the rapid stripping of CsBr and atomic reconstruction, contributing to the production of ultrahigh photo-stable defect-free CsPbBr3 NCs. The robust emission output of the as-obtained CsPbBr3 NCs is well preserved even when recorded after 160 min. Moreover, a long-term stable random lasing could be achieved when excited using an ∼800 nm femtosecond laser for at least 8.6 × 107 laser shots. Our results not only elucidate the photo-induced accelerated phase transformation process of the all-inorganic perovskites, but also open up opportunities to synthesize highly stable CsPbBr3 NCs for their practical application in photovoltaics and optoelectronics.

中文翻译:

超高光稳定全无机钙钛矿纳米晶体及其鲁棒的随机激光

光不稳定性阻碍了全无机钙钛矿纳米晶体(NC)在高功率光电领域的进一步商业化。在这里,在水触发的结构转变过程中,在 365 nm 的辐照下探索了从非发光 Cs 4 PbBr 6到具有亮绿色发射的 CsPbBr 3 NCs 的加速转变过程。365 nm的光子能量提供的光电场促进了CsBr的快速剥离和原子重建,有助于产生超高光稳定无缺陷CsPbBr 3 NCs。所获得的 CsPbBr 3的稳健发射输出即使在 160 分钟后记录,NC 也保存完好。此外,当使用~800 nm 飞秒激光激发至少 8.6 × 10 7激光照射时,可以实现长期稳定的随机激光。我们的研究结果不仅阐明了全无机钙钛矿的光致加速相变过程,而且为合成高度稳定的 CsPbBr 3 NCs 在光伏和光电子学中的实际应用开辟了机会。
更新日期:2020-02-19
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