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Breakthrough in Quantum Dot Technology: Dual Synergistic Passivation Strategy Yields Record Efficiency

Strategic Insights

— 2 min read

Researchers at the Nanjing University of Science and Technology have made a significant advancement in quantum dot technology, achieving a record maximum external quantum efficiency (EQE) of 24.35% in inverted perovskite quantum dot light-emitting diodes (Pe-QLEDs). This breakthrough is attributed to a dual synergistic interfacial passivation strategy employing pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) as a multifunctional buffer layer. The innovative approach not only enhances luminescence efficiency but also suppresses non-radiative recombination, significantly improving the operational stability of the devices.

Key Takeaways:

  • The dual synergistic passivation strategy employing PETMP as a buffer layer has been shown to improve the performance of inverted Pe-QLEDs by 100% compared to conventional devices using polyvinyl pyrrolidone (PVP) buffers.
  • The PETMP layer addresses interfacial incompatibility through two synergistic mechanisms: (I) Thiol groups in PETMP form robust S-Zn bonds with the ZnO electron transport layer, passivating surface oxygen vacancies, improving film morphology, and reducing the electron injection barrier. (II) Concurrently, these thiols coordinate with undercoordinated Pb ions on the Pe-QD surface, enhancing luminescence efficiency and suppressing non-radiative recombination.
  • The optimized interface resulting from this strategy significantly enhances the operational stability of the devices.
  • This research has been peer-reviewed and was published in Angewandte Chemie International Edition.
  • The European Chiropractors' Union, Advanced Centre of Research in High Energy Materials, University of Hyderabad, Svenska Forskningsradet Formas, National Natural Science Foundation of China, and Natural Science Foundation of Jiangsu Province supported this research, which has been reported as a significant advancement in the field of quantum dots and nanotechnology.

Statistics:

  • Record maximum external quantum efficiency (EQE) of 24.35% achieved in inverted green Pe-QLEDs using the dual synergistic passivation strategy.
  • Performance improvement of 100% compared to conventional devices using polyvinyl pyrrolidone (PVP) buffers.
  • Maximum EQE of 12.61% achieved in conventional devices using PVP buffers.
  • 90.7% reduction in electron injection barrier attributed to the PETMP layer.
  • Luminescence efficiency enhancement of 102.5% attributed to the PETMP layer.

Sources:

  • Angewandte Chemie International Edition, 2025.
  • Angewandte Chemie International Edition can be contacted at: Wiley-v C H Verlag Gmbh, Postfach 101161, 69451 Weinheim, Germany.
  • Xiansheng Li, Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
  • Researchers at the Nanjing University of Science and Technology Report New Data on Quantum Dots (High-Performance Inverted Perovskite Quantum Dot Light-Emitting Diodes Enabled by Dual Synergistic Interfacial Passivation). Electronics Newsweekly. October 21, 2025; p 1676.

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