High-Efficiency Light-Emitting Diodes of Organometal Halide Perovskite Amorphous Nanoparticles

• Main Authors: Xing, Jun, Yan, Fei, Zhao, Yawen, Chen, Shi, Yu, Huakang, Zhang, Qing, Zeng, Rongguang, Demir, Hilmi Volkan, Sun, Xiaowei, Huan, Alfred, Xiong, Qihua
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2017
• Subjects: Electroluminescence; Light-emitting Diodes
• Online Access: https://hdl.handle.net/10356/86318; http://hdl.handle.net/10220/43981
• Institution: Nanyang Technological University

Organometal halide perovskite has recently emerged as a very promising family of materials with augmented performance in electronic and optoelectronic applications including photovoltaic devices, photodetectors, and light-emitting diodes. Herein, we propose and demonstrate facile solution synthesis of a series of colloidal organometal halide perovskite CH3NH3PbX3 (X = halides) nanoparticles with amorphous structure, which exhibit high quantum yield and tunable emission from ultraviolet to near-infrared. The growth mechanism and photoluminescence properties of the perovskite amorphous nanoparticles were studied in detail. A high-efficiency green-light-emitting diode based on amorphous CH3NH3PbBr3 nanoparticles was demonstrated. The perovskite amorphous nanoparticle-based light-emitting diode shows a maximum luminous efficiency of 11.49 cdA-1, a power efficiency of 7.84 lmW-1, and an external quantum efficiency of 3.8%, which is 3.5 times higher than that of the best colloidal perovskite quantum-dot-based light-emitting diodes previously reported. Our findings indicate the great potential of colloidal perovskite amorphous nanoparticles in light-emitting devices.