Thermal management towards ultra-bright and stable perovskite nanocrystal-based pure red light-emitting diodes

Hongjin Li, Xiaofang Zhu, Dingshuo Zhang, Yun Gao, Yifeng Feng, Zichao Ma, Jingyun Huang, Haiping He, Zhizhen Ye () and Xingliang Dai ()
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Hongjin Li: Zhejiang University
Xiaofang Zhu: Zhejiang University
Dingshuo Zhang: Zhejiang University
Yun Gao: Zhejiang University
Yifeng Feng: Zhejiang University
Zichao Ma: Zhejiang University
Jingyun Huang: Zhejiang University
Haiping He: Zhejiang University
Zhizhen Ye: Zhejiang University
Xingliang Dai: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Despite the promising candidacy of perovskite nanocrystals for light-emitting diodes, their pure red electroluminescence is hindered by low saturated luminance, severe external quantum efficiency roll-off, and inferior operational stability. Here, we report ultra-bright and stable pure red light-emitting diodes by manipulating Joule heat generation in the nanocrystal emissive layer and thermal management within the device. Diphenylphosphoryl azide-mediated regulation of the nanocrystal surface synergistically enhances the optical properties and carrier transport of the emissive layer, enabling reduced Joule heat generation and thus lowering the working temperature. These merits inhibit ion migration of the CsPb(Br/I)3 nanocrystal film, promising excellent spectra stability. Combined with the highly thermal-conductive sapphire substrates and implementation of pulse-driving mode, the pure red light-emitting diodes exhibit an ultra-bright luminance of 390,000 cd m−2, a peak external quantum efficiency of 25%, suppressed efficiency roll-off, an operational half-life of 20 hours, and superior spectral stability within 15 A cm−2.

Date: 2024
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DOI: 10.1038/s41467-024-50634-0

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