Enhancement of white light OLED efficiency by combining both internal and external light extraction structures

I-Ling Kao; Chun-Neng Ku; Yi-Ping Chen; Ding-Zheng Lin

doi:10.1117/12.929461

13 September 2012 Enhancement of white light OLED efficiency by combining both internal and external light extraction structures

I-Ling Kao, Chun-Neng Ku, Yi-Ping Chen, Ding-Zheng Lin

Author Affiliations +

Proceedings Volume 8476, Organic Light Emitting Materials and Devices XVI; 84761U (2012) https://doi.org/10.1117/12.929461
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

We proposed an internal nanostructure with a high reflective index planarization layer to solve the optical loss due to the reflective index mismatch between ITO and glass substrate. In our experiments, we found the electrical property of OLED device was significantly influenced by the internal nanostructures without planarization layer. Moreover, the internal extraction structure (IES) is not necessarily beneficial for light extraction. Therefore, we proposed a new substrate combine both internal and external extraction structure (EES) to extract trapping light. We successfully developed a high refractive index (N~1.7) planarization material with flat surface (RMS roughness < 2 nm), and improved about 70% device efficiency compared to traditional glass substrate.

Citation Download Citation

I-Ling Kao, Chun-Neng Ku, Yi-Ping Chen, and Ding-Zheng Lin "Enhancement of white light OLED efficiency by combining both internal and external light extraction structures", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761U (13 September 2012); https://doi.org/10.1117/12.929461

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