Lead halide perovskite nanowire lasers with low lasing thresholds and high quality factors
Lead halide perovskite nanowire lasers with low lasing thresholds and high quality factors
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DOI：
10.1038/nmat4271
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发表时间：
2015-06-01
期刊：
影响因子：
41.2
通讯作者：
Zhu, X-Y.
中科院分区：
文献类型：
--
作者：
Zhu, Haiming;Fu, Yongping;Zhu, X-Y.
卤化铅钙钛矿在太阳能电池中的卓越性能可归因于长载流子寿命和低非辐射复合率，这与半导体激光器的理想物理特性相同。在这里，我们展示了单晶卤化铅钙钛矿纳米线的室温和波长可调激光，具有非常低的激光阈值（220 nJ cm（-2））和高品质因数（Q类似于3，600）。激光阈值对应于低至1.5 × 1016 cm（-3）的载流子密度。动力学分析的基础上，时间分辨荧光显示在这些单晶纳米线很少的电荷载流子捕获，并估计激光量子产率接近100%。这种激光性能，加上单晶纳米线的简易溶液生长和发射颜色的宽化学计量依赖性可调谐性，使得卤化铅钙钛矿成为纳米光子学发展的理想材料，同时也是相同材料的光致发光的快速发展。
The remarkable performance of lead halide perovskites in solar cells can be attributed to the long carrier lifetimes and low non-radiative recombination rates, the same physical properties that are ideal for semiconductor lasers. Here, we show room-temperature and wavelength-tunable lasing from single-crystal lead halide perovskite nanowires with very low lasing thresholds (220 nJ cm(-2)) and high quality factors (Q similar to 3,600). The lasing threshold corresponds to a charge carrier density as low as 1.5 x 1016 cm(-3). Kinetic analysis based on time-resolved fluorescence reveals little charge carrier trapping in these single-crystal nanowires and gives estimated lasing quantum yields approaching 100%. Such lasing performance, coupled with the facile solution growth of single-crystal nanowires and the broad stoichiometry-dependent tunability of emission colour, makes lead halide perovskites ideal materials for the development of nanophotonics, in parallel with the rapid development in photovoltaics from the same materials.