Highly efficient and ultra-stable CsPbBr 3 composites for LCD devices and X-ray imaging

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-03, Vol.12 (10), p.3465-3473
• Main Authors: Wang, Peng, Wang, Zhaoyu, Zhu, Meiyi, Cai, QiuTing, Huang, Hanyan, Tang, Chengyuan, Zhang, Haoran, Fan, Chao, Dai, Xingliang, He, Haiping, Ye, Zhizhen
• Format: Article
• Language: English
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/D3TC04701F

Achieving excellent optical properties and stability is crucial for the practical utilization of perovskite emitters. Herein, ultra-stable CsPbBr 3 -DPSI/MS composites with a high photoluminescence quantum yield (PLQY) of 93.2% are obtained through passivation of the surface of CsPbBr 3 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 CsPbBr 3 -DPSI/MS composites represent the most stable CsPbBr 3 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 CsPbBr 3 -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 .