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Proceedings Paper

Effect of horizontal molecular orientation on triplet-exciton diffusion in amorphous organic films
Author(s): T. Sawabe; I. Takasu; T. Yonehara; T. Ono; J. Yoshida; S. Enomoto; I. Amemiya; C. Adachi
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Paper 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.

Paper Details

Date Published: 13 September 2012
PDF: 6 pages
Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84760L (13 September 2012); doi: 10.1117/12.929121
Show Author Affiliations
T. Sawabe, Toshiba Corp. (Japan)
I. Takasu, Toshiba Corp. (Japan)
T. Yonehara, Toshiba Corp. (Japan)
T. Ono, Toshiba Corp. (Japan)
J. Yoshida, Toshiba Corp. (Japan)
S. Enomoto, Toshiba Corp. (Japan)
I. Amemiya, Toshiba Corp. (Japan)
C. Adachi, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 8476:
Organic Light Emitting Materials and Devices XVI
Franky So; Chihaya Adachi, Editor(s)

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