Organic light-emitting diodes using spherical aggregates

Chihaya Adachi, Seiji Hibino, Asuka Yamamori, Masahiro Uchida, Toshiki Koyama, Yoshio Taniguchi

Research output: Contribution to journalConference articlepeer-review


We have succeeded in fabricating submicrometer-sized organic light emitting diodes (OLED) with bright emission using a polymer blend. The cell structure was composed of ITO (indium-tin oxide)/hole transport layer (polymer blend layer)/emitter layer/MgAg. We used poly (methyl methacrylate) (PMMA) as an inert host material and N,N′-diphenyl-N,N′-bis(3-methylphenyl)-[1,1′-biphenyl]-4,4 ′-diamine-polycarbonate (PC-TPD) as a guest material. The polymer blend layers showed various morphology depending on the concentration of PC-TPD. With 2wt% of PC-TPD, the PC-TPD formed submicrometer-sized spherical domains, actually prolate spheroids, in the PMMA host layer. The domain diameters were around 200 nm according to AFM and SEM observations. The OLED including such a blend structure showed aggregation of bright submicrometer-sized electroluminescence spots. The number of working diodes exceeded four million per square centimeter.

Original languageEnglish
Pages (from-to)62-69
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1997
Externally publishedYes
EventOrganic Light-Emitting Materials and Devices - San Diego, CA, United States
Duration: Jul 30 1997Aug 1 1997

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Computer Science Applications


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