Xing, J.Yan, F.Zhao Y.Chen, S.Yu, H.Zhang, Q.Zeng, R.Demir, Hilmi VolkanSun, X.Huan, A.Xiong, Q.2018-04-122018-04-1220161936-0851http://hdl.handle.net/11693/36721Organometal 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. © 2016 American Chemical Society.EnglishElectroluminescenceLight-emitting diodesNanoparticlesOrganometal halide perovskitePhotoluminescenceArticle10.1021/acsnano.6b01540