Random lasing actions in self-assembled perovskite nanoparticles

Abstract

Abstract：Solution-based perovskite nanoparticles have been intensively studied in past few years due to their applications in both photovoltaic and optoelectronic devices. Here, based on the common ground between the solution-based perovskite and random lasers, we have studied the mirrorless lasing actions in self-assembled perovskite nanoparticles. After the synthesis from solution, discrete lasing peaks have been observed from the optically pumped perovskites without any well-defined cavity boundaries. The obtained quality (Q) factors and thresholds of random lasers are around 500 and 60 J/cm 2 , respectively. Both values are comparable to the conventional perovskite microdisk lasers with polygon shaped cavity boundaries. From the corresponding studies on laser spectra and fluorescence microscope images, the lasing actions are considered as random lasers that are generated by strong multiple scattering in random gain media. In additional to conventional single-photon excitation, due to the strong nonlinear effects of perovskites, twophoton pumped random lasers have also been demonstrated for the first time. We believe this research will find its potential applications in low-cost coherent light sources and biomedical detection.

The Role of Excitons on Light Amplification in Lead Halide Perovskites

“…Interestingly, the above unique properties of lead halide perovskites also make them to be ideal lasing materials . Soon after the reports of light amplifications in lead halide perovskite thin films, lasing actions have been widely observed in a number of lead halide perovskite based microstructures, e.g., microspheres, microrods, nanorods, microplates, and even random media . And record low thresholds, high Q factors, and unidirectional laser emission have been realized in single‐crystalline microstructures.…”

Directing Random Lasing Emission Using Cavity Exciton-Polaritons

“…directly from polycrystalline and nanocrystals thin films. This has indeed been demonstrated in iodine-based perovskites [27][28][29][30][31], chloride-based perovskites [32] and bromide-based perovskites [32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Advances in inorganic and hybrid perovskites for miniaturized lasers

“…In 2016, Liu et al observed the random laser in selfassembled MAPbBr 3 perovskite nanoparticles with a threshold of 60 μJ/cm 2 and quality factor of 500 [78]. When the excited position changed slightly, all laser characteristics changed correspondingly, thus confirming that the laser was formed by the scattering between internal nanoparticles rather than the overall boundaries.…”