Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Microcavity Effect of Top-emission Organic Light-emitting Diodes Using Aluminum Cathode and Anode

  • Lee, Chang-Jun (Department of Chemistry/Display Research Center, The Catholic University of Korea) ;
  • Park, Young-Il (Department of Chemistry/Display Research Center, The Catholic University of Korea) ;
  • Kwon, Jang-Hyuk (Department of Information Display, Kyung Hee University) ;
  • Park, Jong-Wook (Department of Chemistry/Display Research Center, The Catholic University of Korea)
  • Published : 2005.09.20
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Abstract

We report microcavity effect of top emission organic light-emitting diodes (OLEDs) by using Al cathode and anode, which are feasible for not only top emission EL and angle dependant effects but facile evaporation process without ion sputtering. The device in case of $Alq_3$ green emission showed largely shifted EL maximum wavelength as 650 nm maximum emission. It was also observed that detection angle causes different EL maximum wavelength and different CIE values in R, G, B color emission. As a result, the green device using $Alq_3$ emission showed 650 nm emission ($0^{\circ}$) to 576 nm emission ($90^{\circ}$) as detection angle changed. We believe that these phenomena can be also explained with microcavity effect which depends on the different length of light path caused by detection angle.

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References

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