Journal
ORGANIC ELECTRONICS
Volume 9, Issue 5, Pages 805-808Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2008.05.011
Keywords
top-emitting OLEDs; CuI; Ag electrode; Lambertian
Funding
- Information Display RD Center [F0004071-2007-23]
- Ministry of Knowledge Economy (MOKE)
- National Research Foundation of Korea [과C6A2003] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Efficient top-emitting organic light-emitting diodes were fabricated using copper iodide (CuI) doped 1,4-bis[N-(1-naphthyl)-N'-phenylamino]-4,4'-diamine (NPB) as a hole injection layer and Ir(PPY)(3) doped CBP as the emitting layer. CuI doped NPB layer functions as an efficient p-doped hole injection layer and significantly improves hole injection from a silver bottom electrode. The top-emitting device shows high current efficiency of 69 cd/A with Lambertian emission pattern. The enhanced hole injection is originated from the formation of the charge transfer complex between Cut and NPB. (C) 2008 Elsevier B.V. All rights reserved.
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