The inserted dipole layer enables highly powerful blue perovskite quantum dot-based light-emitting diodes

2026-04-29

PRE

Yingyi Nong

Shalong Wang

Jisong Yao *

Yuzhu Xu

Jindi Wang

Weichuang Guo

Yuting Liu

Leimeng Xu

Zhi Yang

Jizhong Song *

DOI：10.1016/j.scib.2026.04.061

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Persistent efforts have pushed the external quantum efficiencies (EQEs) of blue perovskite light-emitting diodes (LEDs) beyond 25%. However, the power efficiency (PE) of these devices remains limited—a key performance indicator quantifying electricity consumption in LEDs. Here, we incorporate polymer dipoles formed by the ordered dipolar structure of poly(1,1-difluoroethylene) (PVDF) into the CsPbCl3−xBrx quantum dot (QD) layer to regulate the injected electrons and holes. Meanwhile, the polar F and H atoms on PVDF molecules can interact with the Pb and Br/Cl ions on QD surface, respectively, thereby suppressing trap-assisted nonradiative losses. These combined features have enabled blue perovskite LED with a higher luminance at a lower driving voltage, resulting in a record PE of 43.9 lm W−1. Moreover, the device presents a record EQE of 28.7%, a low turn-on voltage of 2.2 V, as well as a maximum luminance of 5474 cd m−2. These findings provide valuable guidance for developing the energy-conserving perovskite lighting sources.

Keywords:

blue perovskite LEDs

power efficiency

quantum dot layer

dipole layer

nonradiative losses

The inserted dipole layer enables highly powerful blue perovskite quantum dot-based light-emitting diodes

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