Date

Place

[P1-99]
14:00 ~ 15:30
Title:Slot Die Coating for Multilayer Organic Light-Emitting Diodes
Kwang-Jun Choi, Jin-Young Lee, Jin-Hwan Lee, Dongkyun Shin, Su-Ho Yoo, Kyung-Jun Jeon, and Jongwoon Park (Korea Univ. of Tech. and Education, Korea)
Abstract: We investigate three technical issues related with large-area slot-die coating for OLED lightings. One issue is the flow down problem of an aqueous polymer solution, which occurs at the perimeter of an insulator bank. Another issue is that pinhole-like surface appears in solution-processed small-molecule films. The other issue is the dissolution problem that occurs between two stacked layers with different solvents during slot-die coating. By optimizing the slot-die coating process, we have suppressed those phenomena to a great extent. To demonstrate it, we have fabricated large-area green phosphorescent OLED devices. For the hole injection layer (HIL), we used aqueous PEDOT:PSS solution. For the hole transport layer (HTL), we have coated the small-molecule KHT-001 solution (Duksan Neolux Co., Ltd.). It is demonstrated that OLEDs with slot-die coated multiple layers show almost the same device performance as a reference OLED device with the spin-coated HIL and vacuum-evaporated HTL.
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