Effect of horizontal molecular orientation on triplet-exciton diffusion in amorphous organic films

T. Sawabe, I. Takasu, T. Yonehara, T. Ono, J. Yoshida, S. Enomoto, I. Amemiya, Chihaya Adachi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Triplet harvesting is a candidate technology for highly efficient and long-life white OLEDs, where green or red phosphorescent emitters are activated by the triplet-excitons diffused from blue fluorescent emitters. We examined two oxadiazole-based electron transport materials with different horizontal molecular orientation as a triplet-exciton diffusion layer (TDL) in triplet-harvesting OLEDs. The device characteristics and the transient electroluminescent analyses of the red phosphorescent emitter showed that the triplet-exciton diffusion was more effective in the highly oriented TDL. The results are ascribed to the strong orbital overlap between the oriented molecules, which provides rapid electron exchange (Dexter energy transfer) in the TDL.

Original languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XVI
Volume8476
DOIs
Publication statusPublished - 2012
EventOrganic Light Emitting Materials and Devices XVI - San Diego, CA, United States
Duration: Aug 12 2012Aug 15 2012

Other

OtherOrganic Light Emitting Materials and Devices XVI
CountryUnited States
CitySan Diego, CA
Period8/12/128/15/12

All Science Journal Classification (ASJC) codes

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

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    Sawabe, T., Takasu, I., Yonehara, T., Ono, T., Yoshida, J., Enomoto, S., Amemiya, I., & Adachi, C. (2012). Effect of horizontal molecular orientation on triplet-exciton diffusion in amorphous organic films. In Organic Light Emitting Materials and Devices XVI (Vol. 8476). [84760L] https://doi.org/10.1117/12.929121