Highly Efficient Red, Green, and Blue Inverted Top‐Emitting Organic Light‐Emitting Diodes with Microstructured TiN Substrate

Author:

Shi Wei12ORCID,Zheng Haixia12,Zhao Yunping12,Pu Xianyong3,Shui Xinfeng4,Lin Yang12,Chen Guo12,Yang Xuyong12,Zhang Guoqi3,Wei Bin12ORCID

Affiliation:

1. Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 P. R. China

2. School of Mechatronic Engineering and Automation Shanghai University Shanghai 200444 P. R. China

3. Academy for Engineering and Technology Fudan University Shanghai 200433 P. R. China

4. Anhui Sholon New Material Technology Co., Ltd. Chuzhou Anhui Province 239500 P. R. China

Abstract

The morphological and optical properties of microstructured silicon substrates (M–Si) and inverted top‐emitting organic light‐emitting diodes (ITOLEDs) based on the M–Si/Ti/TiN/Al composite electrodes are studied. The developed M–Si/Ti/TiN/Al composite electrodes function well in improving the performance of red, green, and blue ITOLED. The Al thin film deposited on TiN silicon substrate could significantly improve the reflectivity of the electrode, and the microstructured substrate could further increase the reflective path for lights inside OLEDs. Meanwhile, by adopting a light output‐coupling layer on top of the device and using the localized surface plasmon resonance effect of the top‐emitting structure, the angle‐dependent effect of ITOLEDs based on the composite electrodes is reduced. Through employing the M–Si/Ti/TiN/Al composite electrodes, all the red, green, and blue OLEDs achieve an improved performance, and the red OLED shows the best performance enhancement, with the luminance of 26 247 cd m−2, maximum current efficient of 30.7 cd A−1, and maximum external quantum efficiency of 17.4%. This provides a new strategy to achieve highly efficient ITOLEDs.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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