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

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

The recombination mechanisms leading to amplified spontaneous emission at the true-green wavelength in CH3NH3PbBr3 perovskites
D. Priante, I. Dursun, M.S. Alias, D. Shi, V.A. Melnikov, T.K. Ng, O.F. Mohammed, O.M. Bakr and B.S. Ooi
Appl. Phys. Lett. 106, 081902, (2015)
D. Priante, I. Dursun, M.S. Alias, D. Shi, V.A. Melnikov, T.K. Ng, O.F. Mohammed, O.M. Bakr and B.S. Ooi
Amplified spontaneous emissions, Display application, Excitation threshold, Radiative recombination, Radiative transitions, Recombination mechanisms, Solid state lighting, Temperature dependent photoluminescences
2015
We investigated the mechanisms of radiative recombination in a CHNHPbBr hybrid perovskite material using low-temperature, power-dependent (77 K), 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 553 nm for CHNHPbBr powders that are encapsulated in polydimethylsiloxane. Amplified spontaneous emission was eventually achieved for an excitation threshold energy of approximately 350 J/cm2. Our results provide a platform for potential extension towards a true-green light-emitting device for solid-state lighting and display applications.






DOI: 10.1063/1.4913463