Codoped Spacer Ratio Effect on Electroluminescence Characteristics of Hybrid White Organic Light-Emitting Diodes for Reduced Efficiency Roll-Off
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概要
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We demonstrated hybrid white organic light-emitting diodes (HWOLEDs) using 1,4-bis{2-[7-N-diphenyamino-2-(9,9-diethyl-9H-fluoren-2-yl)]vinyl} benzene as the fluorescent blue emitter and iridium(III) bis(2-phenylquinoline) acetylacetonate as the phosphorescent red emitter. We also investigated the codoped spacer ratio (CSR) effects of 4,4$'$,4$''$-tris(N-carbazolyl)-triphenylamine (TCTA) and 2,2$'$,2$''$-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBI) on the electroluminescence characteristics of HWOLEDs. The optimized HWOLED with a CSR of $1:3$ (TCTA:TPBI) exhibited a lower efficiency roll-off of 32% than the control device (67%) with a CSR of $1:1$ (TCTA:TPBI). The HWOLED also showed a current efficiency of 12.76 cd/A, an external quantum efficiency of 6.95%, and Commission Internationale de I’Eclairage coordinates of $(0.38,0.39)$ at 1000 cd/m2.
- 2010-09-25
著者
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Yoon Seung
Department Of Chemistry Sung Kyun Kwan University
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Kim Young
Department Of Agricultural Chemistry The University Of Tokyo
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Seo Ji
Department Of Pediatrics School Of Medicine Gyeongsang National University Hospital
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Lee Seok
Department Of Dermatology Yonsei University College Of Medicine
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Park Jung
Department Electrical Engineering Busan National University
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Lee Kum
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea
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Seo Bo
Department of Information Display, Hongik University, Seoul 121-791, Korea
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Yoon Seung
Department of Chemistry, Sungkyunkwan University, Suwon, Kyeonggi-do 440-746, Korea
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YOON Seung
Department of Anaesthesiology and Pain Medicine, College of Medicine, Korea University
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Park Jung
Department of Chemistry, Sungkyunkwan University, Suwon, Kyeonggi-do 440-746, Korea
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Seo Ji
Department of Information Display Engineering, Hong-ik University, Seoul 121-791, Korea
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Kim Young
Department of Information Display, Hongik University, Seoul 121-791, Korea
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Lee Seok
Department of Information Display, Hongik University, Seoul 121-791, Korea
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