Electrochemical determination of the ionization potential and electron affinity of poly(9,9-dioctylfluorene)

Autor:	S. Janietz, Martin Grell, Donal D. C. Bradley, E. P. Woo, M. Inbasekaran, Carsten Giebeler
Rok vydání:	1998
Předmět:	Polyfluorene chemistry.chemical_compound Physics and Astronomy (miscellaneous) chemistry Band gap Electron affinity Analytical chemistry Cyclic voltammetry Electroluminescence Ionization energy Electrochemistry Indium tin oxide
Zdroj:	Applied Physics Letters. 73:2453-2455
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.122479
Popis:	We report cyclic voltammetry measurements for the blue electroluminescent conjugated polymer poly(9,9-dioctylfluorene). Both oxidation and reduction potentials are determined and thus estimates of both the ionization potential Ip and electron affinity Ea of the polymer are obtained for the same sample under the same experimental conditions. We estimate Ip=5.80 eV and Ea=2.12 eV. These results disagree with the common assumption that Ea is, to good approximation, given by the difference between Ip and the optical gap. Measurements on indium tin oxide/polyfluorene/calcium light emitting diode structures are consistent with the deductions from the electrochemical data.
Databáze:	OpenAIRE
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