Efficient deep-blue LEDs based on colloidal CsPbBr<sub>3</sub> nanoplatelets meeting the Rec.2020 standard

Yusheng Song; Sheng Cao; Yijie Wang; Mingyan Chen; Yu Zhang; Qiuyan Li; Shulin Han; Yi Liang; Lei Cai; Jialong Zhao; Bingsuo Zou

doi:10.1038/s41377-025-02019-1

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Efficient deep-blue LEDs based on colloidal CsPbBr₃ nanoplatelets meeting the Rec.2020 standard

Original Articles

- Efficient deep-blue LEDs based on colloidal CsPbBr₃ nanoplatelets meeting the Rec.2020 standard
- Light: Science & Applications Vol. 14, Issue 11, Pages: 3602-3611(2025)
- Affiliations：
  
  1.School of Physical Science and Technology, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China
  2.Hubei Key Laboratory of Energy Storage and Power Battery, School of Optoelectronic Engineering, School of New Energy, Hubei University of Automotive Technology, Shiyan 442002, China
  3.Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250014, China
  4.School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
- Author bio：
  
  Sheng Cao (caosheng@gxu.edu.cn)
  Jialong Zhao (zhaojl@gxu.edu.cn)
  Bingsuo Zou (zoubs@gxu.edu.cn)
- Funds：
- DOI：10.1038/s41377-025-02019-1
  CLC：
- Received：12 May 2025，
  
  Revised：2025-08-17，
  
  Accepted：18 August 2025，
  
  Published Online：22 September 2025，
  
  Published：30 November 2025
- Accepted：
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Song, Y. S. et al. Efficient deep-blue LEDs based on colloidal CsPbBr₃ nanoplatelets meeting the Rec.2020 standard. Light: Science & Applications, 14, 3602-3611 (2025).
DOI：

Song, Y. S. et al. Efficient deep-blue LEDs based on colloidal CsPbBr₃ nanoplatelets meeting the Rec.2020 standard. Light: Science & Applications, 14, 3602-3611 (2025). DOI： 10.1038/s41377-025-02019-1.

摘要

Abstract

Colloidally quantum-confined CsPbBr

nanoplatelets (NPLs) exhibit narrow emission linewidths and thickness-tunable photoluminescence

making them ideal candidates for deep-blue perovskite light-emitting diodes (PeLEDs). However

the weak surface coordination of conventional long-chain ligands (

e.g

oleylamine and oleic acid) leads to face-to-face stacking of the NPLs

resulting in undesirable emission redshifts in their PeLEDs. Herein

we report an efficient deep-blue PeLED based on colloidal CsPbBr

NPLs that meet the Rec.2020 color standard

enabled by an acid-assisted ligand passivation strategy. Surface chemical analysis reveals that hydrobromic acid facilitates proton-assisted stripping of the long-chain ligands

followed by the formation of stable Pb-S-P coordination bonds with thio-tributylphosphine

which exhibits a high adsorption energy (E

ads

= -1.13 eV). This approach significantly improves surface defect passivation

yielding a photoluminescence quantum yield of 96% and a narrow 13 nm full-width-at-half-maximum deep-blue emission. Enhanced exciton recombination and reduced defect state density are evidenced by a prolonged photoluminescence lifetime and slower absorption bleach recovery kinetics. The resulting PeLEDs achieve rec

ord-breaking performance among CsPbBr

NPL-based systems

with a maximum external quantum efficiency of 6.81% at 461 nm

a peak luminance of 143 cd m

-2

and the CIE color coordinates (CIE-y = 0.046) that comply with Rec.2020 standards. This work presents an effective strategy for developing efficient and stable deep-blue perovskite emitters

demonstrating significant potential for the commercialization of perovskite nanomaterials in next-generation ultra-high-definition displays.

关键词

Keywords

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Efficient deep-blue LEDs based on colloidal CsPbBr3 nanoplatelets meeting the Rec.2020 standard

DOI：10.1038/s41377-025-02019-1

摘要

Abstract

关键词

Keywords

references

Efficient deep-blue LEDs based on colloidal CsPbBr₃ nanoplatelets meeting the Rec.2020 standard