Lasing in robust cesium lead halide perovskite nanowires
Lasing in robust cesium lead halide perovskite nanowires
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DOI：
10.1073/pnas.1600789113
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发表时间：
2016-02-23
影响因子：
11.1
通讯作者：
Yang, Peidong
中科院分区：
文献类型：
--
作者：
Eaton, Samuel W.;Lai, Minliang;Yang, Peidong
快速发展的纳米激光器领域可以通过发现新的、可调谐的光源来推进。在钙钛矿材料中显示的发射波长可调性是纳米级激光器的一个有吸引力的特性。虽然有机-无机卤化铅钙钛矿材料以其不稳定性而闻名，但铯卤化铅提供了一个强大的替代方案，而不会牺牲发射可调性或易于合成。在这里，我们报道了低温，液相生长的铯卤化铅纳米线具有低阈值激光和高稳定性。生长的纳米线是单晶的，具有良好的切面，可以作为高质量的激光腔。纳米线在环境条件下储存和处理数周后显示出优异的稳定性。在光激发下，CsPbBr3纳米线发生法布里-珀罗激光，起始点为5 μ J cm(-2)，纳米线腔的最大质量因子为1009 +/- 5。在恒定的脉冲激励下，激光可以保持超过1小时，相当于109个激励周期，并且在暴露于环境大气后仍能持续激光。在光谱的绿色和蓝色区域的波长可调性以及优异的稳定性使这些纳米线激光器对器件制造具有吸引力。
The rapidly growing field of nanoscale lasers can be advanced through the discovery of new, tunable light sources. The emission wavelength tunability demonstrated in perovskite materials is an attractive property for nanoscale lasers. Whereas organic-inorganic lead halide perovskite materials are known for their instability, cesium lead halides offer a robust alternative without sacrificing emission tunability or ease of synthesis. Here, we report the low-temperature, solution-phase growth of cesium lead halide nanowires exhibiting low-threshold lasing and high stability. The as-grown nanowires are single crystalline with well-formed facets, and act as high-quality laser cavities. The nanowires display excellent stability while stored and handled under ambient conditions over the course of weeks. Upon optical excitation, Fabry-Perot lasing occurs in CsPbBr3 nanowires with an onset of 5 mu J cm(-2) with the nanowire cavity displaying a maximum quality factor of 1,009 +/- 5. Lasing under constant, pulsed excitation can be maintained for over 1 h, the equivalent of 109 excitation cycles, and lasing persists upon exposure to ambient atmosphere. Wavelength tunability in the green and blue regions of the spectrum in conjunction with excellent stability makes these nanowire lasers attractive for device fabrication.