Suppression of secondary PL emission by indirect photoexcitation

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A blend of a newly synthesized polyfluorene(PDHBF) and polyvinylcarbazole(PVK) exhibits a photoluminescence(PL) emission spectrum of PDHBF without an increase in the PL intensity on photoexcitation at 340 run, the UV-visible absorption maximum of PVK, despite of a substantial spectrum overlap. However, the indirect photoexcitation of the blend suppresses the secondary emission of the PL with the maximum at 520 nm. The chromophores generating the secondary emission are formed when the chromophores are photoexcited above the critical energy level of an excited state. The chromophores formed by the energy transfer have energy lower than the critical energy and fail to form the excimers. A low temperature PL study of the blend in a cryogenic chamber proves that the energy transfer in the system takes place mainly between the excimers of PVK generated by the partially eclipsed dimeric states of two carbazole units and the fluorophores of PDHBF.
Publisher
John Wiley & Sons Ltd.
Issue Date
2003-03
Language
English
Article Type
Article; Proceedings Paper
Keywords

LIGHT-EMITTING DEVICES; POLYMERS; POLYFLUORENES; DIODES

Citation

MACROMOLECULAR SYMPOSIA, v.192, pp.151 - 160

ISSN
1022-1360
URI
http://hdl.handle.net/10203/86017
Appears in Collection
CH-Journal Papers(저널논문)
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