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A Study on the Efficiency Effects of Capping Layer on the Top Emission Organic Light Emitting Diode  

Lee, DongWoon (Department of Electronics Engineering, Gachon University)
Cho, Eou Sik (Department of Electronics Engineering, Gachon University)
Jeon, Yongmin (Department of Biomedical Engineering, Gachon University)
Kwon, Sang Jik (Department of Electronics Engineering, Gachon University)
Publication Information
Journal of the Semiconductor & Display Technology / v.21, no.3, 2022 , pp. 119-124 More about this Journal
Abstract
Top emission organic light-emitting diode (TEOLED) is commonly used because of high efficiency and good color purity than bottom - emission organic light-emitting device (BEOLED). Unlike BEOLED, TEOLED contain semitransparent metal cathode and capping layer. Because there are many characteristics to consider just simple thickness change, optimizing organic thickness of TEOLED for microcavity is difficult. So, in this study, we optimized Device capping layer at unoptimized micro-cavity structure TEOLED device. And we compare only capping layer with unoptimized microcavity structure can overcome optimized micro-cavity structure device. We used previous our optimized micro-cavity structure to compare each other. As a result, it has been found that the efficiency can be obtained almost the same or higher only capping layer, which is stacked on top of the device and controls only the thickness and refractive index, without complicated structural calculations. This means that higher efficiencies can be obtained more easily in laboratories with limited organic materials or when optimizing new structures etc.
Keywords
Organic light-emitting diode (OLED); Top emission organic light-emitting diode (TEOLED); Alq3; NPB; Micro-Cavity effect; Hole transport layer (HTL); Emission material layer (EML); Mg : Ag; LiF; Capping layer(CPL);
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Times Cited By KSCI : 1  (Citation Analysis)
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