The recombination mechanisms leading to amplified spontaneous emission at the true-green wavelength in CH3NH3PbBr3 perovskites

Davide Priante, Ibrahim Dursun, Mohd Sharizal Alias, Dong Shi, Vasily Melnikov, Tien Khee Ng, Omar F. Mohammed, Osman Bakr, Boon S. Ooi

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95 Scopus citations

Abstract

We investigated the mechanisms of radiative recombination in a CH3NH3PbBr3 hybrid perovskite material using low-temperature, power-dependent (77K), and temperature-dependent photoluminescence (PL) measurements. Two bound-excitonic radiative transitions related to grain size inhomogeneity were identified. Both transitions led to PL spectra broadening as a result of concurrent blue and red shifts of these excitonic peaks. The red-shifted bound-excitonic peak dominated at high PL excitation led to a true-green wavelength of 553nm for CH3NH3PbBr3 powders that are encapsulated in polydimethylsiloxane. Amplified spontaneous emission was eventually achieved for an excitation threshold energy of approximately 350μJ/cm2. Our results provide a platform for potential extension towards a true-green light-emitting device for solid-state lighting and display applications.
Original languageEnglish (US)
Pages (from-to)081902
JournalApplied Physics Letters
Volume106
Issue number8
DOIs
StatePublished - Feb 23 2015

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