Modulation of recombination zone position for quasi-two-dimensional blue perovskite light-emitting diodes with efficiency exceeding 5%

Zhenchao Li, Ziming Chen, Yongchao Yang, Qifan Xue, Hin-Lap Yip () and Yong Cao
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Zhenchao Li: South China University of Technology
Ziming Chen: South China University of Technology
Yongchao Yang: South China University of Technology
Qifan Xue: South China University of Technology
Hin-Lap Yip: South China University of Technology
Yong Cao: South China University of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract In recent years, substantial progress has been made in developing perovskite light-emitting diodes with near-infrared, red and green emissions and over 20% external quantum efficiency. However, the development of perovskite light-emitting diodes with blue emission remains a great challenge, which retards further development of full-color displays and white-light illumination based on perovskite emissive materials. Here, firstly, through composition and dimensional engineering, we prepare quasi-two-dimensional perovskite thin films with improved blue emission, taking advantages of reduced trap density and enhanced photoluminescence quantum yield. Secondly, we find a vertically non-uniform distribution of perovskite crystals in the PEDOT:PSS/perovskite hybrid film. Through modulating the position of the recombination zone, we activate the majority of quasi-two-dimensional perovskite crystals, and thus demonstrate the most efficient blue perovskite light-emitting diode to date with emission peak at 480 nm, record luminance of 3780 cd m−2 and record external quantum efficiency of 5.7%.

Date: 2019
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DOI: 10.1038/s41467-019-09011-5

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