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A Study on the Effects of Micro Cavity on the HTL Thicknesses 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)
Seong, Jin-Wook (Department of Electronics Engineering, Gachon University)
Kwon, Sang Jik (Department of Electronics Engineering, Gachon University)
Publication Information
Journal of the Semiconductor & Display Technology / v.21, no.1, 2022 , pp. 91-94 More about this Journal
Abstract
Top emission organic light-emitting diode is commonly used because of high efficiency and good color purity than bottom - emission organic light-emitting device. Unlike BEOLED, TEOLED contain semi-transparent metal cathode. Because of semi-transparent cathode, micro cavity effect occurs in TEOLED. We optimized this effect by changing the thickness of hole injection layer. Device consists of is indium-tin-oxide / N,N'-Di-[(1-naphthyl)-N,N'-diphenyl]-1,1'-biphenyl-4,4'-diamine (x nm) / tris-(8-hydroxyquinoline) aluminum (50nm) / LiF(0.5nm) / Mg:Ag (1:9), and we changed NPB thickness which is used as HTL in our device in order to study how micro cavity effects are changed by optical path. As the results, NPB thickness at 35nm showed the current efficiency of 8.55Cd/A.
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; Indium-tin-oxide (ITO);
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