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Transparent organic light emitting diodes using a multilayer oxide as a low resistance transparent cathode

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4 Author(s)
Yook, Kyoung Soo ; Department of Polymer Science and Engineering, Dankook University, Jukjeon-dong, Suji-gu, Yongin-si, Kyeonggi-do 448-701, Republic of Korea ; Jeon, Soon Ok ; Woong Joo, Chul ; Lee, Jun Yeob

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Transparent organic light emitting diodes were developed by using a thermally evaporable WO3/Ag/WO3 (WAW) as a transparent cathode. A thin Ag layer was introduced as an interlayer between the Li doped electron transport layer and the WAW electrode. A high transparency over 80% was obtained and electron injection was greatly improved by using the thin Ag interlayer between the Li doped layer and the WAW electrode. The driving voltage at 1000 cd/m2 was only 4.5 V and the sheet resistance of the WAW electrode was as low as 12 Ω/◻.

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Applied Physics Letters  (Volume:93 ,  Issue: 1 )