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High Efficiency Blue Organic Light-Emitting Diode with Three Organic Layer Structure  

Jang, Ji Geun (Department of Electronics Engineering, Dankook University)
Ji, Hyun Jin (Department of Electronics Engineering, Dankook University)
Kim, Hyun (Department of Electronics Engineering, Dankook University)
Kim, Jae Min (Department of Electronics Engineering, Dankook University)
Publication Information
Journal of the Semiconductor & Display Technology / v.11, no.3, 2012 , pp. 33-37 More about this Journal
Abstract
Simple and high efficiency blue organic light-emitting diodes with three organic layers of N, N'-diphenyl-N,N'-bis-[4-(phenyl-m-tolylamino)-phenyl]-biphenyl-4,4'-diamine[DNTPD]/1,1-bis-(di-4-polya-minophenyl)cyclohexane[TAPC]/electron transport material [ET-137] were fabricated and their electroluminescent characteristics were evaluated according to the TAPC thickness variation in a range of $50{\sim}300{\AA}$. Electroluminescence spectra of the devices with structure of DNTPD/TAPC/ET-137 showed all the same central emission wavelengths of 455 nm under an applied voltage of 7V, which were similar with that of the device with ET-137 only. On the other hand, the electroluminescence spectra of the device with structure of DNTPD/ET-137 without TAPC layer showed double emission peaks at the wavelengths of 455 nm and 561 nm under an applied voltage of 7V. In the devices with structure of DNTPD/TAPC/ET-137, single peak blue emission was not maintained in the device with $50{\AA}$-thick TAPC above 8V by the formation of exciplex. In the device with $300{\AA}$-thick TAPC, however, single peak blue emission was maintained until 10 V. According to the thickness increase of TAPC in the fabricated devices, the current density and luminance decreased, but the luminous efficiency and roll-off characteristics were improved.
Keywords
Blue OLED; Exciplex; Luminance; Current efficiency; Efficiency roll-off;
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