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Black Photoresist for Patterning Pixel Define Layer of Organic Light Emitting Diode with Polyimide as Thermal Stabilizer
CC Tech, Cheonan, South Korea
Samsung Display Co., Ltd., Yongin, South Korea
School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
- 1 CC Tech, Cheonan, South Korea
- 2 Samsung Display Co., Ltd., Yongin, South Korea
- 3 School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
Materials Sciences and Applications·Volume 09 (2018)·Pages 554–564·Published 25 May 2018·DOI10.4236/msa.2018.96040
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Abstract
In order to improve the visibility for outside use of organic light emitting diodes (OLEDs), the polarized film and black matrix pattern have been used in the small and medium sized OLEDs; however, these cause problem of reducing the emission efficiency of OLED. Changing the color of pixel define layer (PDL) from brown to black is an important point for improving the efficiency and visibility of OLEDs. In this work we studied the photoresist material containing black pigment and the photolithographic process for patterning of black PDL on OLEDs. The black PDL patterns made with our synthesized polyimides as thermal stabilizer were found to give high thermal stability over 300 ° C.
KeywordsOrganic Light Emitting DiodePixel Define LayerBlack Pixel Define LayerPhotolithography
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