8 September 2004 Cavity effect of transparent organic emitting device using metal cathode
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We simulated modification of brightness as electrode, ITO anode and semitransparent cathode in the transparent organic light emitting device (TOLED). Semitransparent cathodes were used thin metal films, Ca-Ag and LiF-Al. Ca-Ag electrode has a higher transmittance 71% and lower reflectance 13% as compared to 32% and 24% of LiF-Al at 530nm. Reflectance of these material affected brightness and spectrum. Ratio of emitted lights intensity through ITO and metal cathode was calculated theoretically to use reflectance and transmittance of each electrode. Calculated ratio of brightness is in agreement with the measured ones to each electrode. Brightness of emitted light through ITO is about 3.2 and 1.5 times higher than through LiF-Al and Ca-Ag cathodes, respectively. In case of LiF-Al, ratio of transmitted light through the electrode was very different and spectra of light through LiF-Al were accompanied with the interference fringes.
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Chan J. Lee, Chan J. Lee, Ramchandea Balaji Pode, Ramchandea Balaji Pode, Dae-Gyu Moon, Dae-Gyu Moon, Jeong-In Han, Jeong-In Han, } "Cavity effect of transparent organic emitting device using metal cathode", Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.545348; https://doi.org/10.1117/12.545348

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