Issue 41, 2023

Positive aging in InP-based QD-LEDs encapsulated with epoxy: the role of thiol molecules and post-annealing treatment

Abstract

In this study, we uncover remarkable aging behavior in InP-based quantum dot light-emitting diodes (QD-LEDs) encapsulated with epoxy, where the current efficiency increases over time. Our investigation reveals that positive aging is driven by the diffusion of thiol molecules among the components of epoxy resin. As the aging process progresses, the epoxy components not only mitigate the photoluminescence loss in the QDs caused by the presence of ZnMgO nanoparticles and the Al electrode on top of the QD layer but also reduce the electron injection into the QD layer, leading to improved efficiency. Moreover, we found that the post-annealing treatment has a significant impact on the performance of the device. By carefully modulating the diffusive behavior, the optimal aging process results in significant enhancement in the overall performance of the green InP-based QD-LED. With a maximum luminance of 15 340 cd m−2 and a maximum external quantum efficiency of 5.13%, the improvement is approximately 30-fold. This study sheds light on the intricate interplay between the aging process, thiol molecules, and post-annealing treatment in QD-LEDs and opens avenues for further optimization and improvement.

Graphical abstract: Positive aging in InP-based QD-LEDs encapsulated with epoxy: the role of thiol molecules and post-annealing treatment

  • This article is part of the themed collection: #MyFirstJMCC

Supplementary files

Article information

Article type
Paper
Submitted
16 Kho 2023
Accepted
13 Ndz 2023
First published
14 Ndz 2023

J. Mater. Chem. C, 2023,11, 14292-14298

Positive aging in InP-based QD-LEDs encapsulated with epoxy: the role of thiol molecules and post-annealing treatment

H. Jang, S. Shin, M. Lee, N. Gwak, S. Kim, Y. Lee and N. Oh, J. Mater. Chem. C, 2023, 11, 14292 DOI: 10.1039/D3TC02098C

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