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CHEN Ye, YANG Zunxian, GUO Tailiang. Efficient and Stable Quantum Dot Light-emitting Diodes via Carrier Injection Rate Regulation[J]. CHINESE JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY. DOI: 10.13922/j.cnki.cjvst.202412017
Citation: CHEN Ye, YANG Zunxian, GUO Tailiang. Efficient and Stable Quantum Dot Light-emitting Diodes via Carrier Injection Rate Regulation[J]. CHINESE JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY. DOI: 10.13922/j.cnki.cjvst.202412017

Efficient and Stable Quantum Dot Light-emitting Diodes via Carrier Injection Rate Regulation

  • Quantum dot (QDs) based light-emitting diode devices (QLEDs) attracted significant academic interest due to their outstanding color saturation and convenient solution-based manufacturing processes. At present, the external quantum efficiency (EQE) of cadmium-based red, green and blue QLEDs has reached the theoretical limit, but there is still severe carrier injection imbalance, which will lead to a significant reduction in the stability and lifetime of the device. In this work, the electron transport layer (ETL) is doped by a simple method to reduce the electron mobility and achieve a more balanced carrier injection. When an appropriate amount of ethanolamine (EA) solution is added to the ethanol solution of ZnMgO, the amine ion (NH2) can fill the oxygen vacancy in ZnMgO, thereby regulating the electron mobility of ZnMgO. Compared with the control device, the EQE of the optimized device increased to 14.6%, the current efficiency (CE) increased to 60.7 cd/A, increased by 1.87 times and 1.94 times respectively, and the peak brightness reached 252402 cd/m2.
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