Self-Assembled δ-CsPbI3 Nanowires for Stable White Light Emission

An all-inorganic cesium lead halide perovskite shows great potential for high-performance optoelectronic devices due to its superior thermal stability compared to the organic-inorganic hybrid counterpart. Among the CsPbI3 family, orthorhombic phase ((5-) CsPbI3, in contrast to its cubic phase (alpha-) counterpart, has been believed to be a non-functional material because of its poor optoelectronic property. Herein, stable and white-light-emitting (5-CsPbI3 nanowires (NWs) were obtained from alpha-CsPbI3 quantum dots through self-assembled and phase transition processes after precisely controlled thermal annealing treatment. The optimized (5-CsPbI3 NWs exhibit a broad emission spectrum (similar to 410 to similar to 800 nm) and an impressive photoluminescence quantum yield of 8%. Moreover, as a proof-of-concept application, the white-light-emitting diode (WLED) lamp bead with excellent operational stability are obtained by packing an InGaN-based violet chip (395 nm) and (5-CsPbI3 NWs. Our results give a perspective on (5-phase CsPbI3 for its applications as WLEDs.

Automated summary

An all-inorganic cesium lead halide perovskite has shown potential for high-performance optoelectronic devices due to its superior thermal stability. By controlled thermal annealing, stable white-light-emitting (5-CsPbI3 nanowires were obtained and used to create an excellent operational stability WLED lamp bead.