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.
@article{arxiv.2111.11752,
title = {High-performance green and blue quantum-dot light-emitting diodes with eliminated charge leakage},
author = {Yunzhou Deng and Feng Peng and Yao Lu and Xitong Zhu and Wangxiao Jin and Jing Qiu and Jiawei Dong and Yanlei Hao and Dawei Di and Yuan Gao and Tulai Sun and Linjun Wang and Lei Ying and Fei Huang and Yizheng Jin},
journal= {arXiv preprint arXiv:2111.11752},
year = {2022}
}