Recent advancements have led to the development of bright and heavy metal-free blue-emitting quantum dot light-emitting diodes (QLEDs). However, consensus understanding of their distinct photophysical and electroluminescent dynamics remains elusive. This work correlates the chemical and electronic changes occurring in a QLED during operation using depth-resolved and operando techniques. The results indicate that oxygen vacancy forms in the ZnMgO layer during operation, with important implications on the charge injection and electrochemical dynamics. Taken together, the results suggest a causal relationship between oxygen vacancy formation and operational degradation of the blue-emitting ZnSeTe-based QLEDs.
Cite
@article{arxiv.2509.12598,
title = {Oxygen vacancy formation in ZnSeTe blue quantum dot light-emitting diodes},
author = {Shaun Tan and Sujin Park and Seung-Gu Choi and Oliver J. Tye and Ruiqi Zhang and Jonah R. Horowitz and Heejae Chung and Vladimir Bulović and Jeonghun Kwak and Jin-Wook Lee and Taehyung Kim and Moungi G. Bawendi},
journal= {arXiv preprint arXiv:2509.12598},
year = {2025}
}