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학술지 Transparent Organic Light-Emitting Diodes with Different Bi-Directional Emission Colors Using Color-Conversion Capping Layers
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저자
이종희, Tae-Wook Koh, 조현수, Tobias Schwab, Jae-Hyun Lee, Simone Hofmann, 이정익, Seunghyup Yoo, Karl Leo, Malte C. Gather
발행일
201506
출처
Journal of Luminescence, v.162, pp.180-184
ISSN
0022-2313
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.jlumin.2015.02.032
협약과제
14PB2200, AMOLED TV용 soluble TFT 및 화소 형성 소재/공정 기술 개발, 이종희
초록
We report a study on transparent organic light-emitting diodes (OLEDs) with different bi-directional emission colors, enabled by color-conversion organic capping layers. Starting from a transparent blue OLED with an uncapped Ag top electrode exhibiting an average transmittance of 33.9%, a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM)-doped tris-(8-hydroxy-quinolinato)-aluminum (Alq3) capping layer is applied to achieve color-conversion from blue to orange-red on the top side while maintaining almost unchanged device transmittance. This color-conversion capping layer does not only change the color of the top side emission, but also enhances the overall device efficiency due to the optical interaction of the capping layer with the primary blue transparent OLED. Top white emission from the transparent bi-directional OLED exhibits a correlated color temperature around 6000-7000 K, with excellent color stability as evidenced by an extremely small variation in color coordinate of ??(x,y)=(0.002, 0.002) in the forward luminance range of 100-1000 cd m-2. At the same time, the blue emission color of bottom side is not influenced by the color conversion capping layer, which finally results in different emission colors of the two opposite sides of our transparent OLEDs.
키워드
Bi-directional OLED, Color conversion capping layer, Down-conversion white OLED, Transparent OLED
KSP 제안 키워드
Bi-directional, Blue OLEDs, Blue emission, Capping layer, Color stability, Device efficiency, Directional emission, Emission color, Methyl-, Optical interaction, Organic capping