Reciprocally Photovoltaic Light-Emitting Diode Based on Dispersive Perovskite Nanocrystal

作者：Li, Jiong; Duan, Chenghao; Wen, Qiaoyun; Yuan, Ligang; Zou, Shibing; Chen, Chang; Xie, Weiguang; Lin, Dongxu; Chan, Christopher C. S.; Wong, Kam Sing; Yan, Keyou^*

来源：Small, 2022, 18(18): 2107145.

DOI：10.1002/smll.202107145

• electroluminescence
• multifunctional diodes
• perovskite nanocrystals
• photovoltaics
• reciprocity relation

Integrating highly efficient photovoltaic (PV) function into light-emitting diodes (LEDs) for multifunctional display is of great significance for compact low-power electronics, but it remains challenging. Herein, it is demonstrated that solution engineered perovskite nanocrystals (PNCs, approximate to 100 nm) enable efficient electroluminescence (EL) and PV performance within a single device through tailoring the dispersity and interface. It delivers the maximum brightness of 490 W sr(-1) m(-2) at 2.7 V and 23.2% EL external quantum efficiency, a record value for near-infrared perovskite LED, as well as 15.23% PV efficiency, among the highest value for nanocrystal perovskite solar cells. The PV-EL performance is well in line with the reciprocity relation. These all-solution-processed PV-LED devices open up viable routes to a variety of advanced applications, from touchless interactive screens to energy harvesting displays and data communication.