Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent

Kebin Lin, Jun Xing, Li Na Quan, F. Pelayo García Arquer, Xiwen Gong, Jianxun Lu, Liqiang Xie, Weijie Zhao, Di Zhang, Chuanzhong Yan, Wenqiang Li, Xinyi Liu, Yan Lu, Jeffrey Kirman, Edward H. Sargent (), Qihua Xiong () and Zhanhua Wei ()
Additional contact information
Kebin Lin: Huaqiao University
Jun Xing: Nanyang Technological University
Li Na Quan: University of Toronto
F. Pelayo García Arquer: University of Toronto
Xiwen Gong: University of Toronto
Jianxun Lu: Huaqiao University
Liqiang Xie: Huaqiao University
Weijie Zhao: Nanyang Technological University
Di Zhang: Huaqiao University
Chuanzhong Yan: Huaqiao University
Wenqiang Li: Huaqiao University
Xinyi Liu: Huaqiao University
Yan Lu: Huaqiao University
Jeffrey Kirman: University of Toronto
Edward H. Sargent: University of Toronto
Qihua Xiong: Nanyang Technological University
Zhanhua Wei: Huaqiao University

Nature, 2018, vol. 562, issue 7726, 245-248

Abstract: Abstract Metal halide perovskite materials are an emerging class of solution-processable semiconductors with considerable potential for use in optoelectronic devices1–3. For example, light-emitting diodes (LEDs) based on these materials could see application in flat-panel displays and solid-state lighting, owing to their potential to be made at low cost via facile solution processing, and could provide tunable colours and narrow emission line widths at high photoluminescence quantum yields4–8. However, the highest reported external quantum efficiencies of green- and red-light-emitting perovskite LEDs are around 14 per cent7,9 and 12 per cent8, respectively—still well behind the performance of organic LEDs10–12 and inorganic quantum dot LEDs13. Here we describe visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20 per cent. This achievement stems from a new strategy for managing the compositional distribution in the device—an approach that simultaneously provides high luminescence and balanced charge injection. Specifically, we mixed a presynthesized CsPbBr3 perovskite with a MABr additive (where MA is CH3NH3), the differing solubilities of which yield sequential crystallization into a CsPbBr3/MABr quasi-core/shell structure. The MABr shell passivates the nonradiative defects that would otherwise be present in CsPbBr3 crystals, boosting the photoluminescence quantum efficiency, while the MABr capping layer enables balanced charge injection. The resulting 20.3 per cent external quantum efficiency represents a substantial step towards the practical application of perovskite LEDs in lighting and display.

Keywords: External Quantum Efficiency (EQE); Balanced Charge Injection; Perovskite Films; Perovskite Precursor; Photoluminescence Quantum Yield (PLQY) (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1038/s41586-018-0575-3

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