Light Out‐Coupling Enhancement of Blue Quantum‐Dot Light‐Emitting Diodes with Internal Diffraction Wrinkle Pattern

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. Th...

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Bibliographic Details
Published in:Physica status solidi. PSS-RRL. Rapid research letters 2023-10, Vol.17 (10)
Main Authors: Qi, Hui, Guo, Peng, Yuan, Peiling, Zang, Shuaipu, Ding, Xingxing, Zhang, Ying, Jin, Wentao, Zhang, Kun, Chen, Ling
Format: Article
Language:English
Subjects:
Coupling
Diffraction patterns
Gratings (spectra)
Light emitting diodes
Quantum efficiency
Waveguides
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Summary: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.
ISSN:1862-6254
1862-6270
DOI:10.1002/pssr.202300173