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Efficient Optical Amplification in the Nanosecond Regime from Formamidinium Lead Iodide Nanocrystals
ACS Photonics ( IF 7 ) Pub Date : 2018-01-07 00:00:00 , DOI: 10.1021/acsphotonics.7b01159
Paris Papagiorgis 1 , Andreas Manoli 1 , Loredana Protesescu 2, 3 , Charis Achilleos 1 , Miltiadis Violaris 1 , Konstantinos Nicolaides 4 , Theodosis Trypiniotis 4 , Maryna I. Bodnarchuk 3 , Maksym V. Kovalenko 2, 3 , Andreas Othonos 5 , Grigorios Itskos 1
Affiliation  

Lead halide perovskite nanocrystals (NCs) were recently found to exhibit extraordinary optical amplification properties. The great majority of such studies implemented ultrashort photon pulses in the femtosecond regime to initiate the stimulated emission process. Yet the realization of practical lasing applications based on such materials is crucially dependent on their ability to sustain optical amplification at significantly longer time scales, at which major losses associated with spontaneous emission and nonradiative recombination occur. Herein we demonstrate highly efficient amplified spontaneous emission (ASE) from close-packed films of formamidinium lead iodide perovskite (FAPbI3) NCs under excitation in the nanosecond regime. Systematic optimization of the NC processing and thermal treatment yields solids that exhibit high ASE net modal gain up to 604 cm–1 and weakly temperature sensitive ASE thresholds with room-temperature values as low as 140 μJ cm–2. The efficient optical amplification using excitation pulses comparable to the exciton lifetime combined with the excellent chemical durability and air stability of FAPbI3 NCs renders them outstanding gain media for continuous-wave lasers in the red and near-infrared.

中文翻译:

甲酰胺碘化铅纳米晶体在纳秒制中的高效光学放大

最近发现卤化钙钛矿型纳米晶体(NCs)具有非凡的光学放大性能。大多数此类研究在飞秒范围内实施了超短光子脉冲,以启动受激发射过程。然而,基于这样的材料的实际激光应用的实现关键取决于它们在相当长的时间尺度上维持光学放大的能力,在该时间尺度上会发生与自发发射和非辐射重组相关的重大损失。在此,我们展示了密堆积的甲ami碘化铅钙钛矿(FAPbI 3)薄膜的高效放大自发发射(ASE)。)在纳秒级激发下的NCs。通过对NC加工和热处理进行系统优化,可以产生高ASE净模态增益(高达604 cm –1)和对温度敏感的ASE阈值(室温值低至140μJcm –2)的固体。使用与激子寿命相当的激发脉冲进行有效的光放大,再加上FAPbI 3 NC出色的化学耐久性和空气稳定性,使其成为红色和近红外连续波激光器的出色增益介质。
更新日期:2018-01-07
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