Effects of metal chloride on promoting the emission efficiency and stability of 2D CsPb2(ClBr)5 perovskite nanocrystals and their application

Two-dimensional (2D) Cu 2+ –Mn 2+ co-doped CsPb 2 (ClBr) 5 nanocrystals (NCs) with various Cu/Mn molar ratios were synthesized by a simple one-pot method at room temperature. Additionally, we encapsulated C 3 H 9 SiCl to protect the co-doped CsPb 2 (ClBr) 5 NCs from moisture. The analysis of the structure and composition confirmed the phase and chemical composition of the 2D co-doped CsPb 2 (ClBr) 5 NCs. Steady-state and time-resolved photoluminescence (PL) spectroscopy revealed the enhanced optical properties of the 2D co-doped CsPb 2 (ClBr) 5 NCs. Meanwhile, the optical properties of Cu 2+ –Mn 2+ co-doped NCs presented the good thermal stability even after 36 days. The photoluminescence quantum yields (PLQYs) related to the Mn 2+ emission of the 2D co-doped CsPb 2 (ClBr) 5 NCs increased to 97.36% at a Cu/Mn molar ratio of 0.05/1. Furthermore, a prototype white light-emitting device (WLED) was successfully assembled by combining orange‒red Cu 2+ –Mn 2+ co-doped CsPb 2 (ClBr) 5 NCs, a CsPbBr 3 film, and a 365 nm commercial UV chip; this prototype confirms its potential for a wide range of applications in general lighting.