Optoelectronic and photophysical properties of polyfluorene blends as side-chain length and shape

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The effects of side chain length and shape at the C-9 position of fluorene in poly(9,9'dihexylfluorene) (PDHF), poly(9,9'-dioetylfluorene) (PDOF), and poly(9,9'-dicyclohexylheptylfluorene) (PDHHF) on optoelectronic and photophysical properties have been investigated in terms of Forster-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 PVL/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.
Publisher
Amer Chemical Soc
Issue Date
2004-09
Language
English
Article Type
Article
Keywords

ELECTROLUMINESCENT CONJUGATED POLYMERS; ENERGY-TRANSFER DYNAMICS; MONTE-CARLO SIMULATIONS; LIGHT-EMITTING-DIODES; RELAXATION DYNAMICS; EMISSION PROPERTIES; FLUORESCENCE; FILMS; POLY(N-VINYLCARBAZOLE); PHOTOLUMINESCENCE

Citation

MACROMOLECULES, v.37, no.18, pp.6945 - 6953

ISSN
0024-9297
DOI
10.1021/ma049772w
URI
http://hdl.handle.net/10203/85938
Appears in Collection
CH-Journal Papers(저널논문)
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