Interface-regulated Vapor Crystallization for Ultrapure Perovskite LEDs

Achieving ultranarrow spectral linewidth and broad spectral tunability in light-emitting diodes (LEDs) remains challenging due to linewidth broadening from compositional and size heterogeneities. Herein, we report an interface-regulated vapor 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 vapor. 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 realise narrow spectral linewidth, broad spectral tunability, and high performance in thin film LEDs.

Authors

Publication Details

Journal
Apollo
Published
2026-05-29
DOI
https://doi.org/10.17863/cam.130528
Primary Topic
Perovskite Materials and Applications
Type
article
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article

Interface-regulated Vapor Crystallization for Ultrapure Perovskite LEDs

Caterina Ducati, Xian Wei Chua, Zher Ying Ooi, Benedetta Gaggio et al.
Apollo
Perovskite Materials and Applications
article

Interface-regulated Vapor Crystallization for Ultrapure Perovskite LEDs

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

Abstract

Achieving ultranarrow spectral linewidth and broad spectral tunability in light-emitting diodes (LEDs) remains challenging due to linewidth broadening from compositional and size heterogeneities. Herein, we report an interface-regulated vapor 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 vapor. 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 realise narrow spectral linewidth, broad spectral tunability, and high performance in thin film LEDs.

Apollo
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Perovskite Materials and Applications
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