Electroluminescence of poly(vinylcarbazole) doubly doped with two phosphorescence dyes: investigation of spectral change as a function of driving voltage
Article Abstract:
The spectral characteristics of PVK film doubly doped with two phosphorescent dyes ca. green Ir(ppy)(sub 3) and red [Ru(4,7-Ph2-phen)(sub 3)](super 2+) (or PtOEP) in photoexcitation and EL devices is presented. The relationship between R(sub i) and R(sub c) is found to depened on the driving voltage, which reflects that the various mechanisms (singlet energy transfer and charge trapping) may contribute to the emission process of phosphorescence polymer LEDs.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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Electron-transfer oxidation properties of substituted Bi-, Ter-, and quaterpyrroles
Article Abstract:
A set of open-chain fully substituted bi-, ter-, and quaterpyrroles bearing analogous substituents in the [alpha]- and [beta]-pyrrolic positions are evaluated as a function of their chain length, subunit number and size of potential conjugation pathway. The results have indicated that the unpaired electron is more delocalized on the pyrroles with a longer conjugation and that the more the unpaired is delocalized, the faster is the electron exchange rate.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
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