Transparent organic light-emitting diodes with different bi-directional emission colors using color-conversion capping layers

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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 Delta(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.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-06
Language
English
Article Type
Article
Keywords

WHITE-LIGHT; DEVICES; EFFICIENCY

Citation

JOURNAL OF LUMINESCENCE, v.162, pp.180 - 184

ISSN
0022-2313
DOI
10.1016/j.jlumin.2015.02.032
URI
http://hdl.handle.net/10203/199050
Appears in Collection
EE-Journal Papers(저널논문)
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