Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Lead halide perovskite nanocrystals (LHP NCs) have emerged as outstanding light emitting materials exhibiting luminescence with near unity quantum yield and narrow linewidth that can be tuned across the entire visible via facile ion exchange reactions. Some impressive results in amplified spontaneous emission (ASE) and lasing in LHP NCs have been recently demonstrated, the majority of which implement ultrashort pulses in the femtosecond regime to initiate the stimulated emission process. The realization of practical lasing applications though requires sustainability of the optical amplification at much longer timescales, at which competing exciton recombination losses occur.
Herein, comprehensive ASE studies of formamidinium lead iodide (FAPbI3) NC films under excitation in the nanosecond regime are discussed [1]. Two types of solids, containing isolated and partly sintered FAPbI3 NCs can be produced depending on the purification, processing, and post-deposition thermal treatments that the NCs are imposed to. The two types of films are found to exhibit distinct spectral and temperature-dependent spontaneous and stimulated emission characteristics. Both NC types support efficient ASE with slightly better characteristics in the quantum-dot like films in which net modal gain up to ~600 cm-1 and low thresholds down to ~150 μJ cm-2 are observed, making them attractive candidates for optically pumped solution-processed lasers.
We acknowledge 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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