Color-tunable polymer light-emitting diodes with conjugated polymer homojunctions

Chun Yuan Huang, Yan Kuin Su, Chiao Yang Cheng, M. V.Madhava Rao, Ying Chih Chen, Tsung Syun Huang, Ten Chin Wen, Tzung Fang Guo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Color-tunable light-emitting diodes with a polymer homojunction structure have been demonstrated. The homojunction structure consisted of two emissive layers, and poly(9,9-dioctylfluorene) (PFO) was used as the host material in both emissive layers. One emissive layer was composed of a blend of blue-emitting PFO and its green-emitting copolymer, and the other one was composed of a blend of green-emitting PFO copolymer and red-emitting poly[2-methoxy-5(20-ethylhexyloxy)-1,4-phenylene vinylene] (MEHPPV). In device characterization, when the injection current was increased, partial electrons could easily pass through the second emissive layer and flow into the first emissive layer near the anode, because there was no potential barrier existing in the homojunction. Therefore, the emission color of our devices could be tuned as orange, yellow, white, and cyan by adjusting the injection current or bias voltage.

Original languageEnglish
Article number04DK10
JournalJapanese journal of applied physics
Issue number4 PART 2
Publication statusPublished - 2010 Apr

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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