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http://dx.doi.org/10.4313/JKEM.2007.20.3.257

Improved Efficiency and Lifetime for Organic Light-emitting Devices based on Mixed-hole Transporting Layer  

Seo, Jl-Hyun (홍익대학교 정보디스플레이학과)
Park, Jung-Hyun (홍익대학교 정보디스플레이학과)
Park, Il-Hong (홍익대학교 정보디스플레이학과)
Kim, Jun-Ho (홍익대학교 전자공학과)
Kim, Young-Kwan (홍익대학교 정보디스플레이학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.20, no.3, 2007 , pp. 257-262 More about this Journal
Abstract
Organic light-emitting diodes (OLEDs) with the high efficieney and long lifetime are of growing interest in next-generation displays. Among the factors influencing OLEDs properties, one of unstable factor is $Alq_3$ cationic species caused by the excess holes resided in $Alq_3$ layer. Therefore, we suppressed the accumulation of excess holes by using the mixed-hole transporting layer (MHTL) of NPB and CBP in multilayer green OLEDs. The devices with MHTL showed improved characteristics in the luminous efficiency and lifetime. More characteristics and the carrier transport mechanism will be discussed.
Keywords
Organic light-emitting diode; Mixed-hole transporting layer; Excess holes; $Alq_3$ cation;
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