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Singlet and Triplet Energy Transfer in Phosphorescent Dye Doped Polymer Light Emitting Devices

Published online by Cambridge University Press:  15 March 2011

Yong-Young Noh ,
Chang-Lyoul Lee ,
Hae Won Lee ,
Hyun-Nam Cho  and
Jang-Joo Kim
Yong-Young Noh
Affiliation:
Department of Material Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Kwangju 500-712, South Korea
Chang-Lyoul Lee
Affiliation:
Department of Material Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Kwangju 500-712, South Korea
Hae Won Lee
Affiliation:
Department of Material Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Kwangju 500-712, South Korea
Hyun-Nam Cho
Affiliation:
Polymer Materials Laboratory, Korea Institute of Science and Technology, P. O. Box 131, Cheongryang, Seoul 130-650, South Korea
Jang-Joo Kim
Affiliation:
Department of Material Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Kwangju 500-712, South Korea
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Abstract

Effect of host polymers on energy transfer in phosphorescent dye doped polymer light emitting devices has been investigated. Poly (N-vinylcarbazol) [PVK] and poly (9,9'-di-n-hexyl-2,7-fluorene-alt-1,4(2,5dinhexyloxy) phenylene) [PFHP] were examined as the host materials for the phosphorescent dyes fac tris(2-phenypyridine) irdium(III) [Ir(ppy)3] and 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) [PtOEP]. The host and guest materials have the large spectrum overlap between the emission of the hosts and absorption of the guests. When the guests were doped in PVK, the singlet-singlet and triplet-triplet energy transfer took place efficiently. On the contrary, the energy transfer did not take place from φ-conjugated polymer PFHP to the guests, even though common requirements for Förster and Dexter energy transfer were fulfilled. Host aggregation in PFHP based phosphorescent dye doped light emitting devices can play an undesired role obstructing efficient energy transfer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB3.40
Copyright
Copyright © Materials Research Society 2002

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References

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