High stability modified CsPb(ClBr)3@glass@PS for wide color gamut mini-LED backlight displays

Abstract

Perovskite quantum dots (QDs) were considered as a new generation of emitters for lighting and displays due to their high photoluminescence (PL) efficiency and pure color. However, their commercialization process was currently hampered by stability issues and challenges in mass production. Amorphous glass-protected CsPbX₃ perovskite nanocrystals (PNCs) have ultra-pure green light emission and excellent long-term stability. This work demonstrated that CsPb(Cl/Br)₃@glass PNCs were successfully deposited in germane–silicate glass, and CsPbBr₃@glass had bright green luminescence under ultraviolet irradiation, a narrow half-peak width (FWHM) and a high photoluminescence quantum yield (PLQY, 91.5%). The color gamut of the prepared WLED almost covered 123% of the NTSC 1953 standard and 91.8% of the Rec 2020 standard. It was proposed that a one-step mixed pressure film forming method using perovskite glass materials and PS materials can successfully obtain a high-quality, high-luminescence light conversion film, which can accelerate the commercialization of PQDs in display and lighting industries.