1. High-performance green and blue quantum-dot light-emitting diodes with eliminated charge leakage
- Author
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Deng, Yunzhou, Peng, Feng, Lu, Yao, Zhu, Xitong, Jin, Wangxiao, Qiu, Jing, Dong, Jiawei, Hao, Yanlei, Di, Dawei, Gao, Yuan, Sun, Tulai, Wang, Linjun, Ying, Lei, Huang, Fei, and Jin, Yizheng
- Subjects
FOS: Physical sciences ,Applied Physics (physics.app-ph) ,Physics - Applied Physics ,Optics (physics.optics) ,Physics - Optics - 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.
- Published
- 2021