Near-Unity Quantum Yield Conductive Inks of Lead-Free Double Perovskite Quantum Dots for White LEDs
Shikai Chen1, Dandan Wang1, Yuyao Wei1
1Faculty of Informatics and Engineering, The University of Electro-Communications, 1-5-1, Chofugaoka, Chofu, Tokyo, 182-8585, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|September 26, 2025
Summary
Sb3+/Mn2+ co-doped double perovskite quantum dots offer eco-friendly white light. Optimized films show improved conductivity and reduced charge barriers, achieving record electroluminescence efficiency for advanced solid-state lighting.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Double perovskite quantum dots (QDs) offer eco-friendly white light but suffer from charge losses.
- Trap-mediated recombination and poor carrier transport hinder their use in electroluminescent devices.
Purpose of the Study:
- To develop defect-suppressed, conductive double perovskite QD films for efficient light-emitting diodes (LEDs).
- To overcome charge loss limitations in double perovskite QDs for improved electroluminescence.
Main Methods:
- Co-doping Cs2NaInCl6 QDs with Sb3+ and Mn2+ to induce white emission and suppress defects.
- Replacing long-chain ligands with short-chain alternatives to enhance film conductivity and reduce charge injection barriers.
- Fabricating QD inks for defect-suppressed, conductive QD films.
Main Results:
- Sb3+/Mn2+ co-doping yielded near-unity photoluminescence quantum yield and suppressed cation disorder.
- Short-chain ligands increased film conductivity 20-fold and reduced hole injection barrier by 0.4 eV.
- Achieved a record external quantum efficiency of 0.91% for double perovskite QDs in LEDs.
Conclusions:
- This work presents a viable strategy to overcome key limitations in double perovskite electroluminescence.
- The developed QD films pave the way for efficient and eco-friendly solid-state lighting applications.
- Optimized double perovskite QDs demonstrate potential for next-generation display and lighting technologies.
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