Oxygen vacancy formation in ZnSeTe blue quantum dot light-emitting diodes
Published: Sep 16, 2025
Last Updated: Sep 16, 2025
Authors:Shaun Tan, Sujin Park, Seung-Gu Choi, Oliver J. Tye, Ruiqi Zhang, Jonah R. Horowitz, Heejae Chung, Vladimir Bulović, Jeonghun Kwak, Jin-Wook Lee, Taehyung Kim, Moungi G. Bawendi
Abstract
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.