Polymeric tandem organic light-emitting diodes using a self-organized interfacial layer

The authors have demonstrated efficient polymeric tandem organic light-emitting diodes (OLEDs) with a self-organized interfacial layer, which was formed by differences in chemical surface energy. Hydrophilic poly(styrene sulfonate)-doped poly(3,4-ethylene dioxythiophene) (PEDOT:PSS) was spin coated...

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Published in:Applied physics letters 2008-03, Vol.92 (10), p.103301-103301-3
Main Authors: Ryu, Seung Yoon, Kim, Jong Tae, Noh, Joo Hyon, Hwang, Byoung Har, Kim, Chang Su, Jo, Sung Jin, Hwang, Hyeon Seok, Kang, Seok Ju, Baik, Hong Koo, Lee, Chang Ho, Song, Seung Yong, Lee, Se Jong
Format: Article
Language:English
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Summary:The authors have demonstrated efficient polymeric tandem organic light-emitting diodes (OLEDs) with a self-organized interfacial layer, which was formed by differences in chemical surface energy. Hydrophilic poly(styrene sulfonate)-doped poly(3,4-ethylene dioxythiophene) (PEDOT:PSS) was spin coated onto the hydrophobic poly(9,9-dyoctilfluorene) (PFO) surface and a PEDOT:PSS bubble or dome was built as an interfacial layer. The barrier heights of PEDOT:PSS and PFO in the two-unit tandem OLED induced a charge accumulation at the interface in the heterojunction and thereby created exciton recombination at a much higher level than in the one-unit reference. This effect was confirmed in both the hole only and the electron only devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2894072