Efficient blue light-emitting diodes based on quantum-confined bromide perovskite nanostructures

• Published in: Nature photonics Vol. 13; no. 11; pp. 760 - 764
• Main Authors: Liu, Yang, Cui, Jieyuan, Du, Kai, Tian, He, He, Zhuofei, Zhou, Qiaohui, Yang, Zhaoliang, Deng, Yunzhou, Chen, Dong, Zuo, Xiaobing, Ren, Yang, Wang, Liang, Zhu, Haiming, Zhao, Baodan, Di, Dawei, Wang, Jianpu, Friend, Richard H., Jin, Yizheng
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.11.2019; Nature Publishing Group
• Subjects: 639/301/1019/1020; 639/624/1020; Applied and Technical Physics; Color; Electroluminescence; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Letter; Light emitting diodes; Nanoparticles; Organic light emitting diodes; Perovskites; Physics; Physics and Astronomy; Quantum efficiency; Quantum Physics
• ISSN: 1749-4885; 1749-4893
• DOI: 10.1038/s41566-019-0505-4

The emergence of inorganic–organic hybrid perovskites, a unique class of solution-processable crystalline semiconductors, provides new opportunities for large-area, low-cost and colour-saturated light-emitting diodes (LEDs) ideal for display and solid-state lighting applications 1 . However, the performance of blue perovskite LEDs (PeLEDs) 2 – 11 is far inferior to that of their near-infrared, red and green counterparts 12 – 19 , strongly limiting the practicality of the PeLED technology. Here, we demonstrate blue PeLEDs emitting at 483 nm with colour coordinates of (0.094, 0.184) and operating with a peak external quantum efficiency of up to 9.5% at a luminance of 54 cd m –2 . The devices have a T 50 lifetime of 250 s for an initial brightness of 100 cd m –2 . The efficient blue electroluminescence originates from a structure of quantum-confined perovskite nanoparticles embedded within quasi-two-dimensional phases with higher bandgaps, prepared by an antisolvent processing scheme. Our work paves the way towards high-performance PeLEDs in the blue region. Blue light-emitting diodes based on perovskite nanostructures embedded within quasi-two-dimensional phases show highly effective charge injection and suppressed non-radiative recombination.