Highly efficient silica coated perovskite nanocrystals with the assistance of ionic liquids for warm white LEDs

Abstract

Given the inherent characteristics of defect-tolerant, tunable emission performance, and high extinction coefficient, lead halide perovskite nanocrystals (NCs) have attracted widespread attention as a promising material in optoelectronic fields. However,...

Improving the stability of perovskite nanocrystals via SiO2 coating and their applications

“…Specically, when LHP NCs are exposed to external environment, factors such as oxygen, polar solvent, light, and heat cause phase transformation and even structure degradation, resulting in serious photoluminescence (PL) quenching. [6][7][8][9][10] This problem is mainly attributed to two aspects: (1) the intrinsic ionic structure and low lattice energy of LHP NCs; (2) dynamic equilibrium between the adsorption and desorption of ligands on their surface. 11 Moreover, the halide anion exchange reaction between LHP NCs with different emitted colors upon mixing is another issue that hinders their practical application in multicolor display and lighting.…”

CsPbBr3@Glass@SiO2 Composite Materials with Ultrahigh Water Resistance and Thermal Reversibility of Photoluminescence

“…[23][24][25] Similarly, some research encapsulated the CsPbX 3 PQDs with mesoporous SiO 2 nanospheres to improve the extrinsic stability of PQDs. [26][27][28] Recently, due to several excellent physical properties of the glass matrix, such as high rigidity, surface hardness, light transmittance, thermal stability, photostability, and water resistance, the glass matrix has been applied to encapsulate the CsPbX 3 PQDs to enhance their extrinsic stability, including water resistance, thermal stability, and photostability. In the synthesis of CsPbX 3 @glass, a series of glass matrices has been used to encapsulate the CsPbX 3 PQDs, such as phosphosilicate glass, [29][30][31] tellurite glass, [32,33] borogermanate glass, [34][35][36] and borosilicate glass.…”