Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.050
Publication date: 21st November 2018
Lead halide perovskites nanocrystals (LHP NCs) exhibit extraordinary light emission properties rendering the materials highly promising for photonic applications. Extensive work on fully inorganic CsPbX3 NCs with X being Cl, Br, I has already produced impressive results in amplified spontaneous emission and lasing across the visible with thresholds that stand on par with record values reported in traditional colloidal nanocrystals systems.
Almost all such studies, implemented ultrashort photon pulses in the femtosecond regime to initiate the stimulated emission process. Yet the realization of practical lasing applications is crucially dependent on the materials ability to sustain optical amplification at significantly longer timescales, at which major losses associated with spontaneous emission and non-radiative recombination occur. Herein we discuss experiments in which efficient amplified spontaneous emission (ASE) from formamidinium lead iodide perovskite (FAPbI3) NC films under excitation in the nanosecond regime, is demonstrated1. Systematic optimization of the processing and thermal treatment of the perovskite NCs, yields solids that exhibit high ASE net modal gain and low ASE thresholds with relatively weak dependence on sample temperature. Furthermore we find evidence that the stimulated emission build-up is readily influenced by the slowdown of the interband relaxation of hot carriers in FAPbI3 NCs, probed in earlier studies from our group2. Our experiments indicate that the retarded carrier relaxation dynamically compete with hot carrier recombination processes such as hot carrier luminescence with the complex interplay influenced by a number of material and experimental parameters such as temperature, material purity, film quality and excitation wavelength.
G. Itskos acknwoledges financial support from the Research Promotion Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS- YOUNG SCIENTISTS" Programme (Grant Agreement No. "INFRASTRUCTURES/1216/0004", Grant "NANOSONICS")
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