Improved characteristics of organic light emitting diodes with coevaporated Al-alkaline metal cathode
- Authors
- Lee, YS; Park, JH; Kwak, YH; Kim, YJ; Choi, JS
- Issue Date
- 2003
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- alkaline metal; composite contacts; current-voltage characteristics; organic light emitting diode
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.405, pp.89 - 95
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 405
- Start Page
- 89
- End Page
- 95
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/26651
- DOI
- 10.1080/15421400390264207
- ISSN
- 1542-1406
- Abstract
- The cathodes using co-evaporated Al-CsF Al-YF and Al-NaF composites are adopted to enhance the electrical and the optical properties of organic light emitting diodes (OLEDs). The hole transport layer (HTL), 50 nm thick N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4, 4'-diamine (TPD) and the electron transport layer (ETL), 50 nm thick tris(8-hydroxy-quinoline) aluminum (Alq(3)) were deposited under the base pressure of 1.6x10(-6) Torr. In depositing Al-CsF Al-KF and Al-NaF composite contacts, the mass ratio of alkaline metals is varied 1similar to10wt%. OLEDs with alkaline metal-doped cathode have luminance of about 35,000 cd/m(2) and external quantum efficiency of about 1.35%. Alkaline metal tends to diffuse into organic layer and then form AlF3 with the alkaline metal-doped surface region.
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Collections - College of Engineering > School of Electronic & Electrical Engineering > 1. Journal Articles
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