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arXiv · 2111.11752

High-performance green and blue quantum-dot light-emitting diodes with eliminated charge leakage

Yunzhou Deng·Feng Peng·Yao Lu·Xitong Zhu·Wangxiao Jin·Jing Qiu·Jiawei Dong·Yanlei Hao·Dawei Di·Yuan Gao·Tulai Sun·Linjun Wang·Lei Ying·Fei Huang·Yizheng Jin
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Abstract

Quantum-dot light-emitting diodes (QD-LEDs) promise a new generation of efficient, low-cost, large-area, and flexible electroluminescent devices. However, the inferior performance of green and blue QD-LEDs is hindering the commercialization of QD-LEDs in display and solid-state lighting. Here, we demonstrate best-performing green and blue QD-LEDs with ~100% conversion of the injected charge carriers into emissive excitons. Key to this success is eliminating electron leakage at the organic/inorganic interface by using hole-transport polymers with low electron affinity and reduced energetic disorder. Our devices exhibit record-high peak external quantum efficiencies (28.7% for green, 21.9% for blue), exceptionally high efficiencies in wide ranges of luminance, and unprecedented stability (T95 lifetime: 580,000 h for green, 4,400 h for blue). The overall performance surpasses previously reported solution-processed green and blue LEDs.

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Yunzhou Deng, Feng Peng, Yao Lu, Xitong Zhu, Wangxiao Jin, Jing Qiu, Jiawei Dong, Yanlei Hao, Dawei Di, Yuan Gao, Tulai Sun, Linjun Wang, Lei Ying, Fei Huang, Yizheng Jin. 2021-11-23. High-performance green and blue quantum-dot light-emitting diodes with eliminated charge leakage. https://doi.org/10.1038/s41566-022-00999-9

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