Introduction to Quantum Dot Technology
Soochow University has made significant progress in the research of quantum dot light-emitting materials. Novel display technologies based on quantum dots are one of the nation’s strategic emerging industries and represent a competitive frontier among countries like China, Japan, South Korea, and those in Europe and North America. To promote the practical application of high-performance quantum dot light-emitting devices, multiple research institutions and manufacturers worldwide are striving to achieve significant theoretical and technological breakthroughs from various perspectives.
Breakthrough in Perovskite Quantum Dot Films
Recently, Professor Liang-Sheng Liao and Associate Professor Ya-Kun Wang from the Institute of Functional Nanomaterials and Soft Matter at Soochow University have focused on developing perovskite quantum dot films that are both long-range ordered and highly conductive. Through rigorous experimental exploration, they proposed a novel surface manipulation strategy for quantum dots, achieving important breakthroughs in enhancing the light-emitting efficiency and stability of quantum dot devices.
The fabricated perovskite quantum dot light-emitting devices maintained over 20% external quantum efficiency under operational conditions of 1000 nits brightness, and their operational lifespan has increased by more than 100 times, setting a new record for similar devices.
Importance of Long-Range Order in Quantum Dots
The research team emphasizes that the fabrication of long-range ordered quantum dot light-emitting films is crucial for improving exciton utilization efficiency and device stability. Preliminary explorations revealed that while light-emitting devices based on disordered perovskite quantum dots could achieve high efficiency, the large specific surface area of smaller quantum dots would limit charge carrier transport between the quantum dots, leading to poor efficiency and stability under high brightness conditions.
To address this issue, Professor Liao’s research group proposed a dual-ligand synergistic strategy that combines defect state passivation with in-situ removal of smaller quantum dots. This approach successfully produced dense, uniform, defect-free films with long-range order, and their excellent performance has been validated in light-emitting devices.
Conclusion and Future Implications
This work not only offers a new method for the controllable preparation of long-range ordered quantum dot films but also achieves an effective unification of high brightness, high efficiency, and high stability within the perovskite quantum dot system for the first time. These research findings provide a new strategy for the practical application of high-performance quantum dot display devices.
The related results were published online in Nature on May 8, 2024 (DOI: 10.1038/s41586-024-07363-7). Soochow University’s Institute of Functional Nanomaterials and Soft Matter is the sole corresponding unit for the paper, with Associate Professor Ya-Kun Wang as the first author, alongside Haoyue Wan from the University of Toronto as a co-first author; Professor Liang-Sheng Liao serves as the corresponding author. Additionally, Professor Shui-Dong Wang’s research group provided assistance in characterizing film mobility.
Article Title:
Long-range order enabled stability in quantum dot light-emitting diodes
Author Information:
Ya-Kun Wang, Haoyue Wan, Sam Teale, Luke Grater, Feng Zhao, Zhongda Zhang, Hongwei Duan, Muhammad Imran, Shui-Dong Wang, Sjoerd Hoogland, Liang-Sheng Liao
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