유기발광다이오드의 외부 광추출층을 위한 롤투롤마이크로컨택 방식으로 인쇄된 마이크로렌즈 어레이
Roll-to-roll microcontact-printed microlens array for light extraction film of organic light-emitting diodes
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본 연구에서는 유기 발광 다이오드(OLED)의 광추출 향상을 위한 롤투롤 마이크로컨택(mCP)방식으로 인쇄된 마이크로렌즈 어레이(MLA)를 제시하였다. 상업적으로 사용되는 마이크로렌즈 어레이를 템플레이트로 사용하여서 polydimethylpolysiloxane(PDMS)를 롤스탬프로 제작하였다. 낮은 끓는 점을 가지는 불소화 잉크로부터 PDMS 롤스탬프에 고분자 박막을 형성하고 이를 OLED의 하부면에 고압ㆍ고온 처리 없이 인쇄하였다. 최적화된 농도를 찾아서 템플레이트로 사용된 MLA와 거의 동일한 모양의 패턴을 성공적으로 인쇄하였다. 마이크로컨택 방식으로 인쇄된 MLA의 구조와 소재의 낮은 흡수도로 인해서 OLED의 외부양자효율이 18% 향상되었다.
Abstract
We demonstrated roll-to-roll microcontact printed (mCP) microlens array (MLA) to enhance the light extractionof organic light emitting diodes (OLEDs). The commercially provided microlens array is used as a template forpolydimethylsiloxane (PDMS) roll stamp. The fluorinated film is formed on the PDMS roll stamp from fluorinatedink with low boiling point and printed onto the bottom side of the organic light emitting diode without highpressure and high thermal treatment. With optimized concentration of ink, the pattern which is almost identicalto that of the template MLA was successfully printed. Due to the structure and low optical absorbance ofmicrocontact printed MLA, the external quantum efficiency of OLED was improved by about 18%.
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