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http://dx.doi.org/10.4313/JKEM.2007.20.8.711

Efficient Organic Light-emitting Diodes with Aluminum-doped Zinc Oxide Anodes  

Lee, Ho-Nyeon (순천향대학교 전자정보공학과)
Lee, Young-Gu (삼성종합기술원 디스플레이 디바이스&프로세싱 랩)
Jung, Jong-Guk (한국산업기술대학교 신소재공학과)
Lee, Seung-Eui (한국산업기술대학교 신소재공학과)
Oh, Tae-Sik (선문대학교 전자공학부)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.20, no.8, 2007 , pp. 711-715 More about this Journal
Abstract
Properties of organic light-emitting diodes (OLEDs) with aluminum-doped zinc oxide (ZnO:Al) anodes showed different behaviors from OLEDs with indium tin oxide (ITO) anodes according to driving conditions. OLEDs with ITO anodes gave higher current density and luminance in lower voltage region and better EL and power efficiency under lower current density conditions, However, OLEDs with ZnO:Al anodes gave higher current density and luminance in higher voltage region over about 8V and better EL and power efficiency under higher current density over $200mA/cm^2$. These seemed to be due to the differences in conduction properties of semiconducting ZnO:Al and metallic ITO. OLEDs with ZnO:Al anodes showed nearly saturated efficiency under high current driving conditions compared with those of OLEDs with ITO anodes. This meant better charge balance in OLEDs with ZnO:Al anodes. These properties of OLEDs with ZnO:Al anodes are useful in making bright display devices with efficiency.
Keywords
Aluminum-doped zinc oxide (ZnO:Al); Organic light-emitting diode (OLEO); Anode; Efficiency;
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