Department of Chemistry, Columbia University, New York, New York 10027, USA.
Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Nat Mater. 2015 Jun;14(6):636-42. doi: 10.1038/nmat4271. Epub 2015 Apr 13.
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 ∼ 3,600). The lasing threshold corresponds to a charge carrier density as low as 1.5 × 10(16) 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.
卤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，这些物理性质对于半导体激光器来说非常理想。在这里，我们展示了单晶卤铅钙钛矿纳米线在室温下可调谐的激光，其激光阈值非常低（220nJ/cm²），品质因数很高（Q∼3600）。激光阈值对应于低至 1.5×10(16)cm(-3)的载流子密度。基于时间分辨荧光的动力学分析表明，这些单晶纳米线中几乎没有载流子俘获，并给出了接近 100%的估计激光量子产率。这种激光性能，加上单晶纳米线的易于溶液生长以及发射颜色的广泛化学计量比可调谐性，使得卤铅钙钛矿成为开发纳米光子学的理想材料，与同一材料的光伏发展并行不悖。
