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<p>Achieving ultranarrow spectral linewidth and broad spectral tunability in light-emitting diodes (LEDs) remains challenging due to linewidth broadening from compositional and size heterogeneities. Here we report an interface-regulated vapour crystallization strategy that enables precise control over the spectral linewidth of solution-processed halide perovskite thin films. Underlying materials that exhibit minimal molecular interactions with perovskite precursors, exemplified by poly(9-vinylcarbazole), facilitate smooth ion diffusion and crystallization assisted by dimethylformamide vapour. This mechanism leads to perovskite films with both horizontal and vertical homogeneity and low inhomogeneous broadening comparable to that of perovskite single crystals. We demonstrate perovskite films with ultranarrow photoluminescence linewidths of 13.6 nm, 13.7 nm, 13.8 nm and 14.4 nm for emissions at 464 nm, 474 nm, 483 nm and 522 nm, respectively. This enables us to achieve sky-blue perovskite LEDs with narrow electroluminescence linewidths of 14.7 nm and a peak external quantum efficiency of 24.6%, with comparable linewidths and performance in LEDs spanning the pure blue to pure green. This work offers a practical and scalable strategy to realize narrow spectral linewidth, broad spectral tunability and high performance in thin film LEDs.</p><p></p>

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Interface-regulated vapour crystallization for ultrapure perovskite LEDs

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Jian Mao,
  • Qichun Gu,
  • Yunzhou Deng,
  • Milos Dubajic,
  • Thomas A. Selby,
  • Yorrick Boeije,
  • Xinjuan Li,
  • Yang Lu,
  • Zhengkang Qu,
  • Sebastiaan Hoek,
  • Linfeng Pan,
  • Weidong Xu,
  • Tianjun Liu,
  • Yuqi Sun,
  • Yu Zhang,
  • Benedetta Gaggio,
  • Zimu Wei,
  • Zher Ying Ooi,
  • Yutong Han,
  • Alessandro J. Mirabelli,
  • Eunyoung Choi,
  • Shenyu Nie,
  • Yi Shen,
  • Hayley Gilbert,
  • Yuanle Tian,
  • Xian Wei Chua,
  • Joo Sung Kim,
  • Xiaoliang Mo,
  • Fengxian Xie,
  • Jianlu Wang,
  • Judith L. MacManus-Driscoll,
  • Meikang Han,
  • Junhao Chu,
  • Neil C. Greenham,
  • Henning Sirringhaus,
  • Caterina Ducati,
  • Tiarnan A. S. Doherty,
  • Paul A. Midgley,
  • Miguel Anaya,
  • Samuel D. Stranks

摘要

Achieving ultranarrow spectral linewidth and broad spectral tunability in light-emitting diodes (LEDs) remains challenging due to linewidth broadening from compositional and size heterogeneities. Here we report an interface-regulated vapour crystallization strategy that enables precise control over the spectral linewidth of solution-processed halide perovskite thin films. Underlying materials that exhibit minimal molecular interactions with perovskite precursors, exemplified by poly(9-vinylcarbazole), facilitate smooth ion diffusion and crystallization assisted by dimethylformamide vapour. This mechanism leads to perovskite films with both horizontal and vertical homogeneity and low inhomogeneous broadening comparable to that of perovskite single crystals. We demonstrate perovskite films with ultranarrow photoluminescence linewidths of 13.6 nm, 13.7 nm, 13.8 nm and 14.4 nm for emissions at 464 nm, 474 nm, 483 nm and 522 nm, respectively. This enables us to achieve sky-blue perovskite LEDs with narrow electroluminescence linewidths of 14.7 nm and a peak external quantum efficiency of 24.6%, with comparable linewidths and performance in LEDs spanning the pure blue to pure green. This work offers a practical and scalable strategy to realize narrow spectral linewidth, broad spectral tunability and high performance in thin film LEDs.