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<p>Thermal-evaporated perovskite light-emitting diodes are highly promising for future display and lighting. However, multi-source co-evaporation faces challenges such as difficulty in regulating crystallinity, especially for red perovskite light-emitting diodes, whose external quantum efficiencies are still less than 2%. Here, we demonstrate a facile layer-by-layer thermal-evaporation strategy to fabricate high-quality perovskite-emitting films with tunable emission wavelengths. 5-Aminovaleric acid is introduced to regulate interfacial reactions during deposition, slow down crystallization during post-annealing, and passivate defects through coordination interactions. This approach yields perovskite emitting layers with high uniformity and luminance efficiency. As a result, red (670 nm) and deep-red (730 nm) perovskite light-emitting diodes achieve maximum external quantum efficiencies of 9% and 7.27%, and luminance of over 1500 cd m<sup>-2</sup> and 200 W s<sup>-1</sup> m<sup>-2</sup>, respectively. Furthermore, large-area (2500 mm²) and patterned perovskite thin films and light-emitting diodes with outstanding uniformity are successfully demonstrated.</p>

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Sequential layer-by-layer deposition for high-performance fully thermal-evaporated red perovskite light-emitting diodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月26日

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  • Yajing Li,
  • Na Meng,
  • Yutian Xu,
  • Bufan Yu,
  • Junhao Liu,
  • Yuanhao Cui,
  • Ziqiang Wang,
  • Xinwu Ke,
  • Tengfei Pan,
  • Xue Min,
  • Jiangshan Chen,
  • Dongge Ma,
  • Lingfeng Chao,
  • Zhelu Hu,
  • Yingdong Xia,
  • Qingxun Guo,
  • Yonghua Chen,
  • Wei Huang

摘要

Thermal-evaporated perovskite light-emitting diodes are highly promising for future display and lighting. However, multi-source co-evaporation faces challenges such as difficulty in regulating crystallinity, especially for red perovskite light-emitting diodes, whose external quantum efficiencies are still less than 2%. Here, we demonstrate a facile layer-by-layer thermal-evaporation strategy to fabricate high-quality perovskite-emitting films with tunable emission wavelengths. 5-Aminovaleric acid is introduced to regulate interfacial reactions during deposition, slow down crystallization during post-annealing, and passivate defects through coordination interactions. This approach yields perovskite emitting layers with high uniformity and luminance efficiency. As a result, red (670 nm) and deep-red (730 nm) perovskite light-emitting diodes achieve maximum external quantum efficiencies of 9% and 7.27%, and luminance of over 1500 cd m-2 and 200 W s-1 m-2, respectively. Furthermore, large-area (2500 mm²) and patterned perovskite thin films and light-emitting diodes with outstanding uniformity are successfully demonstrated.