Pseudohalide Enhanced Optical Response and Stability of Perovskites for White Lighting-Emitting Diodes

Lead-halide perovskite nanocrystals (NCs) exhibit a better color gamut compared with conventional lighting sources, and comparatively cheaper production costs which may offer an upcoming substitute for future color-converting white lighting devices. However, these NC suffer from poor stability and are highly moisture sensitive that which must be overcome for the successful commercialization of perovskite-based technologies. Herein, we demonstrated the highly luminescent and stable perovskite NCs via the addition of pseudohalide compounds. The new pseudohalide composites gained their photoluminescence quantum yield almost 30% greater than that of parent NCs retaining its initial luminescence properties almost by 90% over a time of 5 months of storage time. White light-emitting diodes based on pseudohalide composites have been fabricated and it shows the excellent color quality and high luminous efficacy.

This work was supported by the National Science Foundation (NSF) under Award No. 1945558.