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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Updated: Jul 10, 2026

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Cuprous-Hybrid Metal Halides with Multimode Self-Trapped Excitons Enable Full-Spectrum White-Light Emission with

Bing Wang1, Yuxin Zhan1, Shen Yan2

  • 1College of Optical and Electronic Technology, China Jiliang University, Hangzhou, Zhejiang 310018, China.

Inorganic Chemistry
|July 9, 2026
PubMed
Summary

Researchers developed a novel zero-dimensional cuprous halide, ETPA2Cu2Br2I2, for efficient white light emission. This material achieves high photoluminescence quantum yield and color rendering index, showing promise for solid-state lighting.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Photophysics

Background:

  • Zero-dimensional (0D) cuprous-based metal halides are emerging luminescent materials.
  • Their tunable structures and self-trapped exciton (STE) emission are key features.
  • Developing efficient white light emitters is crucial for advanced lighting technologies.

Purpose of the Study:

  • To synthesize and characterize a new 0D cuprous halide crystal for white light emission.
  • To investigate the mechanisms behind its broadband STE emission.
  • To evaluate its potential for solid-state lighting applications.

Main Methods:

  • Solution growth method for synthesizing ETPA2Cu2Br2I2 crystals.
  • Temperature-dependent photoluminescence and Raman spectroscopy.
  • Fabrication of a prototype white LED for performance evaluation.

Main Results:

  • Successful synthesis of ETPA2Cu2Br2I2 with a rigid [Cu2Br2I2]2- dimer structure.
  • Observation of dual STE emission channels driven by multimode vibronic coupling.
  • Achieved full-visible-spectrum white light emission with CIE coordinates (0.3337, 0.3449) and 95.94% photoluminescence quantum yield.
  • Prototype white LED demonstrated a high color rendering index (CRI = 88.4).

Conclusions:

  • The synthesized 0D cuprous halide exhibits efficient broadband white light emission.
  • The material's unique structure suppresses nonradiative recombination, enhancing luminescence.
  • ETPA2Cu2Br2I2 shows significant potential for next-generation solid-state lighting and visible light communication.