Affiliation:
1. Department of Electronic and Computer Engineering HKUST Kowloon Hong Kong SAR China
2. State Key Laboratory of Advanced Displays and Optoelectronics Technologies HKUST Kowloon Hong Kong SAR China
Abstract
Metal halide perovskite materials have been widely developed for next‐generation light‐emitting diodes (LEDs) because of their outstanding optoelectronic characteristics. However, it remains impediments to fabricate large‐scale or non‐planar devices by traditional solution methods. Herein, we introduce a close‐spaced vapor reaction method for uniformly growing perovskite quantum wire (QW) arrays in porous alumina membrane templates on unconventional substrates in air. The as‐grown MAPbBr3 QWs showcase a brilliant photoluminescence quantum yield of 92% and a photoluminescence lifetime of 5,644 hours in ambient air. Finally, four‐inch wafer‐scale and spherical LEDs have been successfully demonstrated, suggesting a promising fabrication approach for future large‐scale display and three‐dimensional lighting applications.