Affiliation:
1. College of Physics and Optoelectronic Engineering Zhongyuan University of Technology Zhengzhou 450007 China
2. Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 China
3. College of Materials Engineering Henan University of Engineering Zhengzhou 450007 China
Abstract
Highly efficient blue quantum‐dot light‐emitting diodes (QLEDs) are still a challenge for displays and solid‐state lighting due to light trapping in a device. Herein, an internal diffraction wrinkle pattern is used to demonstrate a spectrum‐independent enhancement strategy for light out‐coupling. The optimized device with wrinkle pattern shows a peak external quantum efficiency of 15.25% and a maximum luminance of 13 134 cd m−2, and the enhancement of those is 23% and 28%, respectively. The improvement of device performance can be attributed to the extraction of waveguide light by the internal wrinkle pattern used as a diffraction grating. Moreover, simulation also shows that wrinkle pattern is an attractive option to improve the performances of blue QLEDs.
Funder
Key Scientific Research Project of Colleges and Universities in Henan Province
National Natural Science Foundation of China
Natural Science Foundation of Henan Province
Natural Science Foundation Project of Chongqing, Chongqing Science and Technology Commission
Subject
Condensed Matter Physics,General Materials Science