Abstract

Green-emitting ${{\rm{CsPbBr}}_3}$ perovskite nanocrystals were synthesized by the modified hot-injection method using three different solvents. The produced nanocrystals showed a narrow green emission band centered at 515–520 nm with full width at half-maximum (FWHM) values of approximately 18–20 nm. The highest photoluminescence quantum yield (PLQY) was obtained for the nanocrystal sample synthesized using a paraffin liquid solvent, with a value of 70.1% under excitation at 450 nm. The ${{\rm{CsPbBr}}_3}$ nanocrystals film light-emitting diodes (LED) chip module showed a luminous efficacy of ${40.7}\;{\rm{lm/}}{{\rm{W}}_{\rm{rad}}}$. The white LED (WLED) with green ${{\rm{CsPbBr}}_3}$ and red ${\rm{CsPb}}{{\rm{I}}_3}$ nanocrystal films emitted bluish-white light with a high color rendering index of 89, and the luminous efficacy of the WLED reached ${16.3}\;{\rm{lm/}}{{\rm{W}}_{\rm{rad}}}$.

© 2020 Optical Society of America

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