All-inorganic quantum dot LEDs based on phase-stabilized α-CsPbI3 perovskite

Ya-Kun Wang, Fanglong Yuan, Yitong Dong, Jiao-Yang Li, Andrew Johnston, Bin Chen, Makhsud I. Saidaminov, Chun Zhou, Xiaopeng Zheng, Yi Hou, Koen Bertens, Hinako Ebe, Dongxin Ma, Zhengtao Deng, Shuai Yuan, Rui Chen, Laxmi Kishore Sagar, Jiakai Liu, James Fan, Peicheng LiXiyan Li, Yuan Gao, Man-Keung Fung, Zheng-Hong Lu, Osman Bakr, Liang-Sheng Liao, Edward Hartley Sargent

Research output: Contribution to journalArticlepeer-review

Abstract

The all-inorganic nature of CsPbI 3 perovskites offers an avenue to enhance stability in perovskite devices. Concerted research efforts have led to improved stability of the black phase in CsPbI 3 films; however, these strategies – including strain and doping – are based on organic-ligand-capped perovskites, which prevent perovskites from forming the close-packed QD solids necessary to achieve high charge transport and thermal transport. Here we develop an inorganic ligand exchange that leads to CsPbI 3 QD films that unite superior phase stability with increased thermal transport. We demonstrate that the atomic ligand exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Further, operando measurements of the temperature of LEDs indicate that KI-exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23% with EL emission centered at 640 nm (FWHM of ~31 nm). These red LEDs provide an operating half lifetime of 10 hours (luminance of 200 cd/m 2 ), an operating stability that is 6x higher than that of control devices.
Original languageEnglish (US)
JournalAngewandte Chemie
DOIs
StatePublished - May 12 2021

ASJC Scopus subject areas

  • Medicine(all)

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