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

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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.

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Acknowledgements

This research was funded by R&D center of BOE Technology Group Co., Ltd. (No. 40009862).

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Authors and Affiliations

  1. BOE Technology Group., Ltd., Beijing, 100176, China

    Yang Li, Dejiang Zhao, Wei Huang, Zhiqiang Jiao, Lu Wang, Qingyu Huang, Peng Wang, Mengna Sun & Guangcai Yuan

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  1. Yang Li
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  2. Dejiang Zhao
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  3. Wei Huang
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  4. Zhiqiang Jiao
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  5. Lu Wang
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  6. Qingyu Huang
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  8. Mengna Sun
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  9. Guangcai Yuan
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Correspondence to Yang Li or Guangcai Yuan.

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12274_2023_5638_MOESM1_ESM.pdf

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

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Li, Y., Zhao, D., Huang, W. et al. Highly efficient quantum dot light-emitting diodes with the utilization of an organic emission layer. Nano Res. 16, 10545–10551 (2023). https://doi.org/10.1007/s12274-023-5638-6

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  • DOI: https://doi.org/10.1007/s12274-023-5638-6

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