Journal
CHINESE PHYSICS B
Volume 30, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1674-1056/ac22a3
Keywords
quantum dot light emitting diodes (QLEDs); chlorine passivation; electron injection
Categories
Funding
- National Key R&D Program of China [2016YFB0401702, 2017YFE0120400]
- National Natural Science Foundation of China [62005114, 62005115, 61875082]
- Key-Area Research and Development Program of Guangdong Province, China [2019B010925001, 2019B010924001]
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting [2017KSYS007]
- Natural Science Foundation of Guangdong Province, China [2017B030306010]
- Guangdong Basic and Applied Basic Research Foundation, China [2019A1515110437]
- Shenzhen Peacock Team Project [KQTD2016030111203005]
- High Level University Fund of Guangdong Province, China [G02236004]
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Insufficient electron injection in blue QLEDs can degrade device efficiency and stability. By using chlorine passivated ZnO nanoparticles as electron transport layer, electron injection into QDs is facilitated and exciton quenching is suppressed, leading to improved efficiency and stability of blue QLEDs.
In blue quantum dot light emitting diodes (QLEDs), electron injection is insufficient, which would degrade device efficiency and stability. Herein, we employ chlorine passivated ZnO nanoparticles as electron transport layer to facilitate electron injection into QDs effectively. Moreover, it suppresses exciton quenching at the QD/ZnO interface by blocking charge transfer channel. As a result, the maximum external quantum efficiency of blue QLED was increased from 2.55% to 4.60%, and the operation lifetime of blue QLED was nearly 4 times longer than that of the control device. Our work indicates that election injection plays an important role in blue QLED efficiency and stability.
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