Color Tunable All-Inorganic Mixed Halide Perovskites for Optoelectronic Applications*

All-inorganic lead halide perovskites have attracted tremendous attention in recent years due to their superior optical properties such as tunable bandgap, narrow line-width emission, and high photoluminescence quantum yield (PLQY). Herein, CsPb(Br_1-xI_x)₃ [0 x<1] perovskite nanocrystals with tunable emission (464-667 nm) and narrow line-width emission (23-47 nm) were synthesized at an ambient atmosphere employing a newly developed saponification technique in our laboratory. The inert gas-glovebox free protocol adopted in this technique offers a simplicity in the preparation of high-quality perovskite nanocrystals. The application of these nanocrystals in white light-emitting diodes (LEDs) leads to tunable correlated color temperature (CCT) with a high color rendering index (CRI .