Amplified Spontaneous Emission in Formamidinium Lead Iodide Perovskite Nanocrystals
Manoli Andreas a, Paris Papagiorgis a, Maryna Bodnarchuk b c, Maksym V.Kovalenko b c, Grigorios Itskos a
a Experimental Condensed Matter Physics Lab, Department of Physics, University of Cyprus, 1678 Cyprus
b Laboratory for Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
c Laboratory for Thin Films and Photovoltaics, Empa − Swiss Federal Laboratories for Materials Science and Technology, Switzerland, Überland Strasse, 129, Dübendorf, Switzerland
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#NCFun19. Fundamental Processes in Semiconductor Nanocrystals
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Ivan Infante and Jonathan Owen
Poster, Manoli Andreas, 375
Publication date: 16th 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")

© Fundació Scito
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