Interface-regulated vapour crystallization for ultrapure perovskite LEDs.
5 affiliations
- 1State Key Laboratory of Photovoltaic Science and Technology, Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, College of Future Information Technology, Institute of Optoelectronics, Fudan University, Shanghai, China.
- 2Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK.
- 3Cavendish Laboratory, University of Cambridge, Cambridge, UK.
- 4Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK.
- 5Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, UK.
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. 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.
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BibTeX
@article{mao2026interfaceregulated,
title = {{Interface-regulated vapour crystallization for ultrapure perovskite LEDs.}},
author = {Jian Mao and Qichun Gu and Yunzhou Deng and Milos Dubajic and Thomas A Selby and Yorrick Boeije and Xinjuan Li and Yang Lu and Zhengkang Qu and Sebastiaan Hoek and Linfeng Pan and Weidong Xu and Tianjun Liu and Yuqi Sun and Yu Zhang and Benedetta Gaggio and Zimu Wei and Zher Ying Ooi and Yutong Han and Alessandro J Mirabelli and Eunyoung Choi and Shenyu Nie and Yi Shen and Hayley Gilbert and Yuanle Tian and Xian Wei Chua and Joo Sung Kim and Xiaoliang Mo and Fengxian Xie and Jianlu Wang and Judith L MacManus-Driscoll and Meikang Han and Junhao Chu and Neil C Greenham and Henning Sirringhaus and Caterina Ducati and Tiarnan A S Doherty and Paul A Midgley and Miguel Anaya and Samuel D Stranks},
journal = {Nature synthesis},
year = {2026},
month = jun,
doi = {10.1038/s44160-026-01100-w},
url = {https://europepmc.org/article/MED/42996298},
note = {CC BY},
}
RIS
TY - JOUR
TI - Interface-regulated vapour crystallization for ultrapure perovskite LEDs.
AU - Jian Mao
AU - Qichun Gu
AU - Yunzhou Deng
AU - Milos Dubajic
AU - Thomas A Selby
AU - Yorrick Boeije
AU - Xinjuan Li
AU - Yang Lu
AU - Zhengkang Qu
AU - Sebastiaan Hoek
AU - Linfeng Pan
AU - Weidong Xu
AU - Tianjun Liu
AU - Yuqi Sun
AU - Yu Zhang
AU - Benedetta Gaggio
AU - Zimu Wei
AU - Zher Ying Ooi
AU - Yutong Han
AU - Alessandro J Mirabelli
AU - Eunyoung Choi
AU - Shenyu Nie
AU - Yi Shen
AU - Hayley Gilbert
AU - Yuanle Tian
AU - Xian Wei Chua
AU - Joo Sung Kim
AU - Xiaoliang Mo
AU - Fengxian Xie
AU - Jianlu Wang
AU - Judith L MacManus-Driscoll
AU - Meikang Han
AU - Junhao Chu
AU - Neil C Greenham
AU - Henning Sirringhaus
AU - Caterina Ducati
AU - Tiarnan A S Doherty
AU - Paul A Midgley
AU - Miguel Anaya
AU - Samuel D Stranks
PY - 2026
DA - 2026/06/22
JO - Nature synthesis
DO - 10.1038/s44160-026-01100-w
UR - https://europepmc.org/article/MED/42996298
AB - 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.
SN - 2731-0582
ER -