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Article

Optoelectronic and Photophysical Properties of Polyfluorene Blends as Side-Chain Length and Shape

Ho Yun Byun,^†^§ In Jae Chung,*^†^§ Hong-Ku Shim,^‡^§ and Chung Yup Kim

Department of Chemical and Biomolecuar Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejon, Korea 305-701; Department of Chemistry, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejon, Korea 305-701; Center for Advanced Functional Polymer, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejon, Korea 305-701; and E-polymer laboratory, Samsung Advanced Institute of Technology, Suwon 449-712, Korea

Macromolecules, 2004, 37 (18), pp 6945–6953

DOI: 10.1021/ma049772w

Publication Date (Web): August 11, 2004

†

Department of Chemical and Biomolecuar Engineering, KAIST.

Center for Advanced Functional Polymer, KAIST.

Corresponding author: Tel +82-42-869-3916; Fax +82-42-869-3910; e-mail chung@kaist.ac.kr.

‡

Department of Chemistry, KAIST.

Samsung Advanced Institute of Technology.

Abstract

The effects of side chain length and shape at the C-9 position of fluorene in poly(9,9‘-dihexylfluorene) (PDHF), poly(9,9‘-dioctylfluorene) (PDOF), and poly(9,9‘-dicyclohexylheptylfluorene) (PDHHF) on optoelectronic and photophysical properties have been investigated in terms of Förster-type energy transfer when they are blended with poly(N-vinylcarbazole) (PVK). PVK/PDHF (w/w, 90/10) shows much more improved photoluminescence and electrololuminescence properties than PVK/PDOF (90/10) and PVK/PDHHF (90/10). The rate (k_T) and the efficiency (E_T) of energy transfer in polymer blends which are obtained from optical properties and fluorescence intensity decay reveal that they depend on the donor−acceptor distance (r), which is altered by the side chain length of fluorene, rather than the spectral overlap integral (J). PVK/PDHHF (90/10) having polyfluorene with the long and bulky cycloheptyl hexyl side chain have a long distance between donor and acceptor with which the rate and the efficiency of energy transfer decrease. However, PVK/PDHF (90/10) shows the best optoelectronic properties due to the short side chain length of PDHF.

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Published In Issue September 07, 2004
Received February 3, 2004
Revised Manuscript Received May 7, 2004

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Article

Optoelectronic and Photophysical Properties of Polyfluorene Blends as Side-Chain Length and Shape

Abstract

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