Ultra-Low Efficiency Roll-Off High Color Purity Blue Perovskite Quantum Dot LEDs with Exceeding 20% Efficiency

Mingyuan Xie; Chenghao Bi; Shibo Wei; Zhentao Jiang; Guo Li; Hangren Li; Yong Zhang; Feng Zhao; Meng-Jiao Li; Hui Lin; Ya-Kun Wang; Liang-Sheng Liao; Silu Tao

doi:10.1038/s41377-026-02231-7

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Ultra-Low Efficiency Roll-Off High Color Purity Blue Perovskite Quantum Dot LEDs with Exceeding 20% Efficiency

Original Articles

- Ultra-Low Efficiency Roll-Off High Color Purity Blue Perovskite Quantum Dot LEDs with Exceeding 20% Efficiency
- Light: Science & Applications Vol. 15, Issue 6, Pages: 1936-1945(2026)
- Affiliations：
  
  1.School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
  2.College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China
  3.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
  4.Center for Carbon-Based Electronics, Peking University, Beijing 100871, China
  5.Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, State Key Laboratory of Bioinspired Interfacial Materials Science, Soochow University, Suzhou 215031, China
- Author bio：
  
  Chenghao Bi (chenghao.bi@hrbeu.edu.cn)
  Ya-Kun Wang (wangyakun@suda.edu.cn)
  Liang-Sheng Liao (lsliao@suda.edu.cn)
  Silu Tao (silutao@uestc.edu.cn)
- Funds：
- DOI：10.1038/s41377-026-02231-7
  CLC：
- Received：25 September 2025，
  
  Revised：2026-01-13，
  
  Accepted：05 February 2026，
  
  Online First：16 March 2026，
  
  Published：30 June 2026
- Accepted：
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Xie, M. Y. et al. Ultra-Low Efficiency Roll-Off High Color Purity Blue Perovskite Quantum Dot LEDs with Exceeding 20% Efficiency. Light: Science & Applications, 15, 1936-1945 (2026).
DOI：

Xie, M. Y. et al. Ultra-Low Efficiency Roll-Off High Color Purity Blue Perovskite Quantum Dot LEDs with Exceeding 20% Efficiency. Light: Science & Applications, 15, 1936-1945 (2026). DOI： 10.1038/s41377-026-02231-7.

摘要

Abstract

Blue perovskite quantum dot light-emitting diodes (QLEDs) are highly attractive for new generation high-definition displays

but their practical deployment is hindered by severe efficiency roll-off at high brightness (

4000 cd m

−2

) while maintaining high color purity (CIEy

0.1). This roll-off arises mainly from non-radiative losses induced by exposed dangling bonds

strong inter-dot coupling

and low permittivity. To conquer this challenge

we develop a multifunctional molecule passivation strategy utilizing 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIMPF

). The [PF

]

−

anions coordinate with lead dangling bonds

cesium sites

and weaken coupling

while [EMIM

]

cations suppress bromine-related defects and inhibit Auger recombination

collectively reducing exciton quenching pathways. This treatment increases the photoluminescence quantum yield of QD films from 78% to 92% and enables spectrally high color purity blue emission at 472 nm (CIEy = 0.091). Crucially

the resulting devices deliver a record-high external quantum efficiency (EQE) exceeding 20% at 6441 cd m

−2

and maintain 18.47% EQE at 9587 cd m

−2

with nearly eliminated roll-off

representing the best performance to date for blue perovskite QLEDs (CIEy

0.1). Moreover

the operational lifetime improves by an order of magnitude compared with previous reports.

关键词

Keywords

references

Shan, Q. S. et al. Perovskite quantum dots for the next-generation displays: progress and prospect. Adv. Funct. Mater. 34 , 2401284 (2024)..

Akkerman, Q. A. et al. Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals. Nat. Mater. 17 , 394–405 (2018)..

Protesescu, L. et al. Nanocrystals of cesium lead halide perovskites (CsPbX 3 , X = Cl, Br, and I): novel optoelectronic materials showing bright emission with wide color gamut. Nano Lett. 15 , 3692–3696 (2015)..

Li, S. et al. Size matters: quantum confinement-driven dynamics in CsPbI 3 quantum dot light-emitting diodes. J. Semiconduct. 46 , 042103 (2025)..

Gao, Y. et al. Highly efficient blue light-emitting diodes based on mixed-halide perovskites with reduced chlorine defects. Sci. Adv. 10 , eado5645 (2024)..

Nong, Y. Y. et al. Gradient hole injection inducing efficient exciton recombination in blue (475 nm) perovskite QLEDs. Nano Lett. 24 , 14594–14601 (2024)..

Yuan, S. et al. Efficient blue electroluminescence from reduced-dimensional perovskites. Nat. Photonics 18 , 425–431 (2024)..

Nong, Y. Y. et al. Boosting external quantum efficiency of blue perovskite QLEDs exceeding 23% by trifluoroacetate passivation and mixed hole transportation design. Adv. Mater. 36 , 2402325 (2024)..

Zhang, K. et al. Nondestructive halide exchange via S N 2-like mechanism for efficient blue perovskite light-emitting diodes. Nat. Commun. 15 , 10621 (2024)..

Yu, Y. et al. Efficient blue perovskite LEDs via bottom-up charge manipulation for solution-processed active-matrix displays. Adv. Mater. 37 , 2503234 (2025)..

Chu, Z. M. et al. Blue perovskite light-emitting diodes using multifunctional small molecule dopants. Adv. Mater. 37 , 2409718 (2025)..

Zhou, Y. T. et al. Use of CsPbCl 3 quantum dots as a chlorine source enables formation of thick quasi-2D perovskite films for high-performance blue light emitting diodes. Adv. Mater. 37 , 2506970 (2025)..

Wang, Y. K. et al. Self-assembled monolayer–based blue perovskite LEDs. Sci. Adv. 9 , eadh2140 (2023)..

Jiang, Y. Z. et al. Synthesis-on-substrate of quantum dot solids. Nature 612 , 679–684 (2022)..

Jang, K. Y. et al. Efficient deep-blue light-emitting diodes through decoupling of colloidal perovskite quantum dots. Adv. Mater. 36 , 2404856 (2024)..

Wei, K. Y. et al. Managing edge states in reduced-dimensional perovskites for highly efficient deep-blue LEDs. Adv. Mater. 37 , 2412041 (2025)..

Dong, J. C. et al. Multivalent-effect immobilization of reduced-dimensional perovskites for efficient and spectrally stable deep-blue light-emitting diodes. Nat. Nanotechnol. 20 , 507–514 (2025)..

Shen, C. et al. Simultaneous interfacial modification a nd crystallization regulation for high-performance pure-blue quasi-2D perovskite light-emitting diodes. ACS Energy Lett. 10 , 3638–3646 (2025)..

Liu, Y. J. et al. A multifunctional additive strategy enables efficient pure-blue perovskite light-emitting diodes. Adv. Mater. 35 , 2302161 (2023)..

Wang, C. H. et al. Dimension control of in situ fabricated CsPbClBr 2 nanocrystal films toward efficient blue light-emitting diodes. Nat. Commun. 11 , 6428 (2020)..

Jiang, Y. Z. et al. Unraveling size-dependent ion-migration for stable mixed-halide perovskite light-emitting diodes. Adv. Mater. 35 , 2304094 (2023)..

Karlsson, M. et al. Mixed halide perovskites for spectrally stable and high-efficiency blue light-emitting diodes. Nat. Commun. 12 , 361 (2021)..

Liu, A. Q. et al. Optimizing perovskite surfaces to enhance post-treatment for efficient blue mixed-halide perovskite light-emitting diodes. Adv. Mater. 37 , 2414788 (2025)..

Bi, C. H. et al. Perovskite quantum dots with ultralow trap density by acid etching-dr iven ligand exchange for high luminance and stable pure-blue light-emitting diodes. Adv. Mater. 33 , 2006722 (2021)..

Yao, Z. W. et al. High brightness and stability pure-blue perovskite light-emitting diodes based on a novel structural quantum-dot film. Nano Energy 95 , 106974 (2022)..

Li, C., Zhang, N. & Gao, P. Lessons learned: how to report XPS data incorrectly about lead-halide perovskites. Mater. Chem. Front. 7 , 3797–3802 (2023)..

Dong, Y. T. et al. Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots. Nat. Nanotechnol. 15 , 668–674 (2020)..

Wang, Y. K. et al. Long-range order enabled stability in quantum dot light-emitting diodes. Nature 629 , 586–591 (2024)..

Lu, P. et al. Multi-species surface reconstruction for high-efficiency perovskite nanocrystal light-emitting diodes. Angew. Chem. Int. Ed. 63 , e202317376 (2024)..

Wei, C. T. et al. Highly ordered inkjet-printed quantum-dot thin films enable efficient and stable QLEDs with EQE exceeding 23%. eScience 4 , 100227 (2024)..

Chen, X. H. et al. Tuning spin-polarized lifetime in two-dimensional metal–halide perovskite through exciton binding energy. J. Am. Chem. Soc. 143 , 19438–19445 (2021)..

Choi, J. H. et al. Linear scaling of the exciton binding energy versus the band gap of two-dimensional materials. Phys. Rev. Lett. 115 , 066403 (2015)..

Satzen, L. et al. Computation of Dielectric constant and loss factor of 1-ethyl-3-methylimidazolium chloride (emim). Int. J. Appl. Phys. 7 , 110–116 (2020)..

Weingärtner, H. The static dielectric permittivity of ionic liquids. J. Mol. Liq. 192 , 185–190 (2014)..

Huang, M. M. et al. Static relative dielectric permittivities of ionic liquids at 25 ℃. J. Chem. Eng. Data 56 , 1494–1499 (2011)..

Cao, L. X. et al. In situ interface reaction enables efficient deep-blue perovskite light-emitting diodes. Angew. Chem. Int. Ed. 64 , e202513617 (2025)..

Yao, Z. W. et al. Decoupling the exciton-carrier interaction for highly efficient pure blue perovskite light-emitting diodes exceeding 20%. Adv. Mater. 37 , e20131 (2025)..

Xie, M. Y. et al. Hard–soft-acid–base management enabled bright and stable pure-blue perovskite quantum dot LEDs. ACS Nano 19 , 28432–28440 (2025)..

Xie, M. Y. et al. Efficient and stable pure-red perovskite LED based on uniform arrangement strongly confined quantum-dot film. ACS Energy Lett. 9 , 4003–4008 (2024)..

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