Ultrabright and stable top-emitting quantum-dot light-emitting diodes with negligible angular color shift

Mengqi Li, Rui Li, Longjia Wu, Xiongfeng Lin, Xueqing Xia, Zitong Ao, Xiaojuan Sun, Xingtong Chen and Song Chen ()
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Mengqi Li: Soochow University
Rui Li: Soochow University
Longjia Wu: Nanshan District
Xiongfeng Lin: Nanshan District
Xueqing Xia: Soochow University
Zitong Ao: Nanshan District
Xiaojuan Sun: Soochow University
Xingtong Chen: Soochow University
Song Chen: Soochow University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Top emission can enhance luminance, color purity, and panel-manufacturing compatibility for emissive displays. Still, top-emitting quantum-dot light-emitting diodes (QLEDs) suffer from poor stability, low light outcoupling, and non-negligible viewing-angle dependence because, for QLEDs with non-red emission, the electrically optimum device structure is incompatible with single-mode optical microcavity. Here, we demonstrate that by improving the way of determining reflection penetration depths and creating refractive-index-lowering processes, the issues faced by green QLEDs can be overcome. This leads to advanced device performance, including a luminance exceeding 1.6 million nits, a current efficiency of 204.2 cd A−1, and a T95 operational lifetime of 15,600 hours at 1000 nits. Meanwhile, our design does not compromise light outcoupling as it offers an external quantum efficiency of 29.2% without implementing light extraction methods. Lastly, an angular color shift of Δu’v’ = 0.0052 from 0° to 60° is achieved by narrowing the emission linewidth of quantum dots.

Date: 2024
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DOI: 10.1038/s41467-024-49574-6

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