Eliminating Positive Aging in Quantum Dot Light-Emitting Diodes by H2O-Treatment
1State Key Laboratory of Quantum Functional Materials, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|May 24, 2025
Summary
Water (H2O) treatment of Quantum Dot Light-Emitting Diodes (QLEDs) passivates defects, enhancing initial efficiency. This controlled method eliminates unpredictable positive aging, paving the way for QLED industrialization.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Quantum dot light-emitting diodes (QLEDs) often show positive aging, where efficiency and brightness increase over time.
- This uncontrolled performance enhancement hinders QLED commercialization despite improving device metrics.
Purpose of the Study:
- To identify the cause of positive aging in QLEDs and develop a method for its control.
- To enhance the initial performance and stability of QLEDs.
Main Methods:
- Investigated the role of water (H2O) generated from the reaction between acidic resin and ZnMgO in defect passivation.
- Developed an in situ H2O treatment strategy for ZnMgO layers and post-annealing of QLED devices.
Main Results:
- Identified H2O as the cause of ZnMgO defect passivation, leading to positive aging.
- Achieved high initial efficiency of 55.2 lm W−1 (26%) in treated QLEDs, significantly outperforming untreated devices.
- Demonstrated complete elimination of positive aging, with stable performance over extended storage periods.
Conclusions:
- The controlled introduction of H2O effectively passivates ZnMgO defects, enabling high initial QLED performance.
- This strategy eliminates uncontrollable positive aging, promoting the industrialization of QLED technology.
