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; C. Adachi

doi:10.1117/12.929121

13 September 2012 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, C. Adachi

Proceedings Volume 8476, Organic Light Emitting Materials and Devices XVI; 84760L (2012) https://doi.org/10.1117/12.929121
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

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.

Citation Download Citation

T. Sawabe, I. Takasu, T. Yonehara, T. Ono, J. Yoshida, S. Enomoto, I. Amemiya, and C. Adachi "Effect of horizontal molecular orientation on triplet-exciton diffusion in amorphous organic films", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84760L (13 September 2012); https://doi.org/10.1117/12.929121

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