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Research Article

Highly efficient quantum dot light-emitting diodes with the utilization of an organic emission layer

Yang Li( ), Dejiang Zhao, Wei Huang, Zhiqiang Jiao, Lu Wang, Qingyu Huang, Peng Wang, Mengna Sun, Guangcai Yuan( )
BOE Technology Group., Ltd., Beijing 100176, China
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Graphical Abstract

Efficient quantum dot light-emitting diodes are demonstrated by the utilization of an organic emitting layer containing host and dopant, which works as an exciton harvester to capture the leaked electrons and affords energy transfer to enhance the emission of quantum dots in the device. As a consequence, a maximum current efficiency of 25.63 cd/A is achieved when using a 10 nm thick, 6% doped organic emitting layer, along with an external quantum efficiency as high as 23.20%.

Abstract

The relative balance of electron and hole injection is crucial for the achievement of highly efficient quantum dot (QD) light-emitting diodes (QLEDs). Here, an inverted red QLED with the utilization of an organic emitting layer (EML) was obtained, exhibiting peak current efficiency (CE) and external quantum efficiency (EQE) of 25.63 cd/A and 23.20%, respectively. In the proposed device, the organic EML, which is a blend of fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) and 4,4’-bis(N-carbazolyl)-1,1’-biphenyl (CBP), works as an exciton harvester to capture the leaked electrons from QD layer and the injected holes from hole transporting layer (HTL), then affording energy transfer from organic EML to the adjacent QD layer so that the emission of QD is enhanced significantly. At the same time, according to the results of hole-only and electron-only devices, the insertion of organic EML promotes the hole injection, and eliminates excess electrons from QD to HTL, thus leading to a better match of hole and electron injection in the device. On the basis of the above benefits, the optimal QLED with a 10 nm organic EML offered ~ 2-fold improvements of CE and EQE, respectively, relative to the control device. Furthermore, a better operational lifetime of QLEDs based on the organic EML was achieved.

Keywords

quantum dotlight emitting diodesorganic emitting layerenergy transfer

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 10545-10551
DOI: 10.1007/s12274-023-5638-6
Cite this article:
Li Y, Zhao D, Huang W, et al. Highly efficient quantum dot light-emitting diodes with the utilization of an organic emission layer. Nano Research, 2023, 16(7): 10545-10551. https://doi.org/10.1007/s12274-023-5638-6
Topics:
Light emitting diodes Semiconductor quantum dots

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Received: 27 October 2022
Revised: 03 March 2023
Accepted: 04 March 2023
Published: 13 April 2023
© Tsinghua University Press 2023
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