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

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• 作者：Jun Xing ; Fei Yan ; Yawen Zhao ; Shi Chen ; Huakang Yu ; Qing Zhang ; Rongguang Zeng ; Hilmi Volkan Demir ; Xiaowei Sun ; Alfred Huan ; Qihua Xiong
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：July 26, 2016
• 年：2016
• 卷：10
• 期：7
• 页码：6623-6630
• 全文大小：496K
• 年卷期：0
• ISSN：1936-086X

文摘

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 cd/A, a power efficiency of 7.84 lm/W, 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.