Highly efficient and ultra-stable CsPbBr3 composites for LCD devices and X-ray imaging

Abstract

Achieving excellent optical properties and stability is crucial for the practical utilization of perovskite emitters. Herein, ultra-stable CsPbBr₃-DPSI/MS composites with a high photoluminescence quantum yield (PLQY) of 93.2% are obtained through passivation of the surface of CsPbBr₃ quantum dots (QDs) by 3-(decyldimethylammonio)-propane-sulfonate inner salt (DPSI) and encapsulating these QDs using silica molecular sieve (MS) templates. After aging for 1000 hours under harsh synergistic conditions (i.e., temperature of 60 °C, relative humidity of 90%, and blue light irradiation with a power density of 3500 W m⁻²), these composites still retain 90% of their initial photoluminescence (PL) intensity. To the best of our knowledge, these CsPbBr₃-DPSI/MS composites represent the most stable CsPbBr₃ emitters in an accelerated aging test under these synergistic humidity–heat–light conditions. The liquid crystal display (LCD) backlight module utilizing these stable composites shows a wide color gamut of 111.7% NTSC. Furthermore, these CsPbBr₃-DPSI/MS composites exhibit exceptional X-ray scintillator performance and impressive radiation hardness, delivering a high X-ray imaging spatial resolution of up to ≈16 lp mm⁻¹ and a low detection limit of 339 nGy_air s⁻¹.