Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Spacer Thickness Effects on the Electroluminescent Characteristics of Hybrid White Organic Light-emitting Diodes

  • Seo, Ji-Hoon (Department of Information Display, Hongik University) ;
  • Park, Jung-Sun (Department of Information Display, Hongik University) ;
  • Seo, Bo-Min (Department of Information Display, Hongik University) ;
  • Kim, Young-Kwan (Department of Information Display, Hongik University) ;
  • Lee, Kum-Hee (Department of Chemistry, Sungkyunkwan University) ;
  • Yoon, Seung-Soo (Department of Chemistry, Sungkyunkwan University)
  • Published : 2009.12.31
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Abstract

The authors have demonstrated the various characteristics of hybrid white organic light-emitting diodes (HWOLED) using fluorescent blue and phosphorescent red emitters. We also demonstrated that two devices showed different characteristics in accordance with thickness of the 4,4′-N,N′-dicarbazole-biphenyl (CBP) spacer (CS) inserted between the blue and the red emitting layer. It was found that the device with a CS thickness of 70 $\AA$ showed a current efficiency 2.5 times higher than that of the control device with a CS thickness of 30 $\AA$ by preventing the triplet Dexter energy transfer from the red to the blue emitting layer. The HWOLED with the CS thickness of 70 $\AA$ exhibited a maximum luminance of 24500 cd/$m^2$, a maximum current efficiency of 42.9 cd/A, a power efficiency of 37.5 lm/W, and Commission Internationale de I'Eclairage coordinates of (0.37, 0.42).

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