POE Enhanced Stabilities of CsPbX3 (X = Br, I) Perovskite and Their White LED Application

Abstract Perovskite has received extensive attention due to its excellent properties, just like photoelectric, while the instability has always troubled us to the wide application of perovskite materials. Herein, we proposed to use SiO2 and POE to encapsulate perovskite nanocrystals (PNCs). In this work, we have successfully prepared a series of perovskite composite materials and films with different concentration ratios. Due to the protection of POE, the luminous intensity of CsPbBr3@POE composite film remained above 90% after stayed in the water for 42 days. The lead concentration of CsPbBr3@POE composite film was 0.8 μg/mL after 48 h of immersing in deionized water. Namely, packaging PNCs in POE could effectively prevent Pb from overflowing reduce Pb pollution. Besides, the composite films showed a wide colour gamut with 117% of NTSC colour gamut, which shows that this composite material has a development prospect in the WLED field.