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

doi:10.1117/12.929121

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

Applied Chemistry

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	Organic Light Emitting Materials and Devices XVI
Volume	8476
DOIs	https://doi.org/10.1117/12.929121
Publication status	Published - 2012
Event	Organic Light Emitting Materials and Devices XVI - San Diego, CA, United States Duration: Aug 12 2012 → Aug 15 2012

Other

Other	Organic Light Emitting Materials and Devices XVI
Country/Territory	United States
City	San Diego, CA
Period	8/12/12 → 8/15/12

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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10.1117/12.929121

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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, Organic Light Emitting Materials and Devices XVI, San Diego, CA, United States, 8/12/12. https://doi.org/10.1117/12.929121

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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.",

author = "T. Sawabe and I. Takasu and T. Yonehara and T. Ono and J. Yoshida and S. Enomoto and I. Amemiya and Chihaya Adachi",

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T1 - Effect of horizontal molecular orientation on triplet-exciton diffusion in amorphous organic films

AU - Sawabe, T.

AU - Takasu, I.

AU - Yonehara, T.

AU - Ono, T.

AU - Yoshida, J.

AU - Enomoto, S.

AU - Amemiya, I.

AU - Adachi, Chihaya

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

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

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