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

Seung Yoon Ryu, Jong Tae Kim, Joo Hyon Noh, Byoung Har Hwang, Chang Su Kim, Sung Jin Jo, Hyeon Seok Hwang, Seok Ju Kang, Hong Koo Baik, Chang Ho Lee, Seung Yong Song, Se Jong Lee

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11 Citations (Scopus)


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.

Original languageEnglish
Article number103301
JournalApplied Physics Letters
Issue number10
Publication statusPublished - 2008

Bibliographical note

Funding Information:
The authors especially thank Professor Jun Yeob Lee from Dankook University for his outstanding advice. This work was supported by the Brain Korea 21(BK21) fellowship program at Korea’s Ministry of Education.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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