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Proceedings Paper

Enhancement of white light OLED efficiency by combining both internal and external light extraction structures
Author(s): I-Ling Kao; Chun-Neng Ku; Yi-Ping Chen; Ding-Zheng Lin
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Paper 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.

Paper Details

Date Published: 13 September 2012
PDF: 6 pages
Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761U (13 September 2012); doi: 10.1117/12.929461
Show Author Affiliations
I-Ling Kao, Industrial Technology Research Institute (Taiwan)
Chun-Neng Ku, Industrial Technology Research Institute (Taiwan)
Yi-Ping Chen, Industrial Technology Research Institute (Taiwan)
Ding-Zheng Lin, Industrial Technology Research Institute (Taiwan)


Published in SPIE Proceedings Vol. 8476:
Organic Light Emitting Materials and Devices XVI
Franky So; Chihaya Adachi, Editor(s)

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