Lithium doping induced self-crystallization of CsPbBr3 nanocrystal glass with improved quantum yield and stability

Abstract All-inorganic CsPbBr3 nanocrystal (NC) has been extensively studied because of its excellent optical properties. However, its poor stability restricts further practical applications. Glass as a carrier can solve this problem well while still maintaining excellent luminescent properties. The traditional CsPbBr3 NC glass is obtained by melt-quenching and heat treatment. In this paper, we first propose LiBr-induced the self-crystallization of CsPbBr3 NC in borosilicate glass without heat treatment. We demonstrated that the lithium changes the glass network structure, resulting in a higher aggregation state in the glass. At the same time, the lithium doping increases the degree of phase separation of the glass. Both of these two factors benefit the formation of the CsPbBr3 NC. The self-crystallized CsPBbr3 NC glass has better luminescent properties than NC glass obtained by heat treatment. What is more, the self-crystallized CsPbBr3 NC glass shows good environmental and water stability, especially thermal stability. We combined blue and red phosphors to construct a white light-emitting diode (WLED), which has excellent application prospects. Our work paves a new path for the research of perovskite nanocrystals, and provides promising development for future optoelectronic applications.