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    AuthorAlias, Mohd Sharizal (1)Bakr, Osman (1)Dursun, Ibrahim (1)Melnikov, Vasily (1)Mohammed, Omar F. (1)View MoreDepartmentChemical Science Program (1)
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    The recombination mechanisms leading to amplified spontaneous emission at the true-green wavelength in CH3NH3PbBr3 perovskites

    Priante, Davide; Dursun, Ibrahim; Alias, Mohd Sharizal; Shi, Dong; Melnikov, Vasily; Ng, Tien Khee; Mohammed, Omar F.; Bakr, Osman; Ooi, Boon S. (Applied Physics Letters, AIP Publishing, 2015-02-23) [Article]
    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.
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