Enhancing the Stability of Perovskite Quantum Dots CsPbX3 (X=Cl, Br, I) by Encapsulation in Porous Y2O3 Nanoparticles for WLED Applications

Abstract Recently, all-inorganic lead halide perovskite quantum dots (PQDs) have raised great attention for various outstanding properties. Although it is a promising candidate for white light emitting diodes (WLED) application, stability issue remains a challenge. In this work, by using a one-step strategy, we successfully achieved nano-sized Y2O3 nanoparticle assisted stability enhancement of multiple all-inorganic lead halide perovskite. Photostability and environmental stability tests show that all dispersed composites retain most of the fluorescence properties. A WLED is fabricated based on as-prepared CsPbBrI2/P-Y2O3 composite. The Commission Internationale de I'Eclairage (CIE) color coordinates of the fabricated WLED is (0.34, 0.35), which is close to the standard white emission coordinate (0.33, 0.33). The luminous efficiency of as-prepared WLED is 61 lm/W with a color render index (CRI) of 83, demonstrating that CsPbBrI2/P-Y2O3 is potential for application in lighting and display technologies.