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Related Experiment Video

Updated: Feb 11, 2026

Label-Retention Expansion Microscopy LR-ExM Enables Super-Resolution Imaging and High-Efficiency Labeling
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Structural Modulation Enables Bright and Efficient Cs-Cu-Cl Electroluminescence.

Yongqiang Ji1,2, Yuquan Wang1, Zexing Yuan2

  • 1Institute of Physics, Henan Academy of Sciences, Zhengzhou, China.

Advanced Materials (Deerfield Beach, Fla.)
|February 10, 2026
PubMed
Summary

Researchers demonstrated electroluminescence (EL) in cesium-copper-chloride (Cs-Cu-Cl) nanocrystals for the first time. This breakthrough offers a non-toxic alternative for white light-emitting diodes (LEDs), achieving high efficiency and luminance.

Keywords:
Cesium‐copper‐halide perovskitesbluish‐white electroluminescenceholistic structual modulationlight‐emitting diodesphotophysical process

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Cesium-copper-halide (Cs-Cu-X) perovskites are explored as non-toxic alternatives to lead-halide perovskites for white light-emitting diodes (LEDs).
  • These materials exhibit unique self-trapped exciton (STE) properties beneficial for broadband electroluminescence (EL).
  • Previous research focused on Cs-Cu-I systems, with no reported EL from Cs-Cu-Cl counterparts.

Purpose of the Study:

  • To demonstrate electroluminescence (EL) in cesium-copper-chloride (Cs-Cu-Cl) nanocrystals (NCs).
  • To investigate the factors contributing to efficient bluish-white EL in Cs-Cu-Cl NCs.
  • To expand the family of copper-based perovskite light-emitting devices for display and lighting applications.

Main Methods:

  • Holistic structural modulation of Cs-Cu-Cl nanocrystals.
  • Fabrication and characterization of Cs-Cu-Cl nanocrystal-based LEDs.
  • Analysis of film morphology, exciton inter-band transitions, triplet STE behavior, and electron transport properties.

Main Results:

  • Successful demonstration of electroluminescence (EL) in Cs-Cu-Cl nanocrystals for the first time.
  • The champion device achieved an external quantum efficiency (EQE) of 2.02% and a luminance of 3345 cd m⁻².
  • Efficient bluish-white EL was attributed to smooth film morphology, exciton inter-band transition, triplet STE behavior, and good electron transport.

Conclusions:

  • Cs-Cu-Cl nanocrystals are a viable material for efficient broadband electroluminescence.
  • The study provides insights into the photophysical processes governing the emission in Cs-Cu-Cl NCs.
  • This work broadens the scope of copper-based perovskites for next-generation lighting and display technologies.