Low Efficiency Roll‐Off and High Current Efficiency Light‐Emitting Diode Enabled by Graded CdSe/ZnSe/ZnS Colloidal Quantum Wells
Colloidal quantum well light-emitting diodes (CQW-LEDs) hold tremendous potential for next-generation display and lighting applications, owing to their high color purity, excellent efficiency, and low fabrication cost. However, efficiency roll-off at high current density makes it challenging to achieve high brightness and long lifetime. Here, we designed CdSe/ZnSe/ZnS core/shell/shell CQWs with near-unity photoluminescence quantum yield. The graded heterostructure promotes carrier injection, and the bottom-emission device based on CdSe/ZnSe/ZnS CQWs exhibits remarkably suppressed efficiency roll-off with a record-high J<sub>90</sub> (current density for EQE to decrease to 90%) of 485 mA/cm<sup>2</sup> and a long operational lifetime (T<sub>95</sub> @ 100 cd/m<sup>2</sup>) over 47000 h. In addition, the top-emission device also shows low efficiency roll-off and high current efficiency of 36.5 cd/A. This study provides a compositionally graded approach to suppress efficiency roll-off in CQW-LEDs, demonstrating the strong potential of the newly developed CQWs for next-generation ultrabright and highly efficient optoelectronic devices.
Authors
- Yunan Gao
- Peng Bai (ORCID: https://orcid.org/0000-0002-0210-0684)
- Qinyun Liu
- Jingjing Qiu (ORCID: https://orcid.org/0000-0003-0660-203X)
- Yunwei Xiao
- Yunke Zhu
- Yang Li
Institutions
- Shanxi University (CN)
- Peking University (CN)
- Beijing Jiaotong University (CN)
- Beijing Institute of Optoelectronic Technology (CN)
- BOE Technology Group (China) (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2026-01-28
- DOI
- https://doi.org/10.1002/adma.202521504
- Citations
- 1
- Primary Topic
- Quantum Dots Synthesis And Properties
- Type
- article
- Field-Weighted Citation Impact
- 16.08
Funders
- National Natural Science Foundation of China
- Peking University
- Fundamental Research Funds for the Central Universities