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August 22, 2026Advanced Optical Materials

Solvothermal‐Assisted Synthesis of Cs 3 Cu 2 I 5 Crystals With Near‐Unity PLQY: Excellent Stability and Dual Applications in White Light Emitting and Anti‐Counterfeiting

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Authors

YFYu FuQGQidi GuoRRRenjie Ru

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Overview

Experimental study demonstrates solvothermal synthesis of lead-free Cs3Cu2I5 crystals with near-unity photoluminescence quantum yield, highlighting uses in white lighting and anti-counterfeiting.

Key Points

  • Develop a cost-effective, sustainable solvothermal-assisted method to synthesize highly stable, lead-free Cs3Cu2I5 perovskite crystals with high luminescence efficiency.
  • Synthesized lead-free Cs3Cu2I5 crystalline powders via a solvothermal-assisted anti-solvent crystallization process.
  • Characterized emission wavelengths, photoluminescence quantum yields (PLQY), fluorescence lifetimes, and reversible phase transformations.
  • Fabricated a white light-emitting diode prototype by blending blue-emitting Cs3Cu2I5 and yellow-emitting CsCu2I3 powders.
  • Produced Cs3Cu2I5 crystals showing intense blue emission at approximately 445 nm with near-unity PLQY, long fluorescence lifetime, and enhanced stability.
  • Established controllable and reversible phase switching between Cs3Cu2I5 and CsCu2I3 for anti-counterfeiting applications.
  • Constructed a standard white light-emitting diode exhibiting balanced color coordinates of (0.33, 0.33).

Cite This Study

Fu et al. (2026) studied this question.

synapsesocial.com/papers/6a895effca7ade938187d483https://doi.org/10.1002/adom.71627
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