Bromide ions substitution-induced photoluminescence tuning in Cs2NaInCl6:Sb3+ double perovskite

Compositional tune and doping/alloying routes have become the research focus for tailoring optical features of lead-free metal halide double perovskites to advance the development of solid-state lighting and display applications. Cs 2 NaInCl 6 double perovskite is receiving tremendous attention owing to its excellent optical properties . In this paper, we have successfully obtained the lead-free Cs 2 NaInCl 6-x Br x :Sb 3+ perovskites using the hydrothermal method . Via the substitution of bromine ions for chloride ions in Cs 2 NaInCl 6 :Sb 3+ , a tunable emission from 445 nm to 480 nm was realized. The X-ray diffraction, scanning electron microscope , UV–vis absorption spectra , PL spectra, TRPL spectra, air stability and thermal stability were investigated in detail. The sample shows an admirable air stability and excellent thermal stability. The results demonstrate that the cyan-emitting Cs 2 NaInCl 6-x Br x :Sb 3+ perovskites can be applied to white LEDs, especially for the full-spectrum LED illumination.