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Efficient Deep-Blue Organic Light-emitting Diodes with Double-Emission Layers  

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)
Lee, Kum-Hee (Department of Chemistry, Sungkyunkwan University)
Park, Jung-Keun (Department of Chemistry, Sungkyunkwan University)
Yoon, Seung-Soo (Department of Chemistry, Sungkyunkwan University)
Kim, Young-Kwan (Department of Information Display, Hongik University)
Publication Information
Journal of Information Display / v.10, no.3, 2009 , pp. 107-110 More about this Journal
Abstract
Efficient deep-blue organic light-emitting diodes were demonstrated using 4,4'-bis(9-ethyl-3-carbazovinylene)-1,1'-biphenyl doped in double-emission layers (D-EMLs). The D-EML system, which consists of 2-methyl-9,10-di(2-naphthyl)anthracene and 1,4-(dinaphthalen-2-yl)-naphthalene as blue hosts, was employed to broaden the recombination zone and to ensure the good confinement of the holes and electrons. The optimized device showed a peak current efficiency of 4.47 cd/A, a peak external quantum efficiency of 4.09%, and Commission Internationale de L'Eclairage coordinates of (0.16, 0.10).
Keywords
Deep-blue organic light-emitting diodes; double-emission layer;
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