Regensburg 2002 – scientific programme
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SYOH: Organische Halbleiter
SYOH 5: Organic Light-Emitting Devices
SYOH 5.1: Talk
Monday, March 11, 2002, 16:15–16:30, H37
Fluorescence, Delayed Fluorescence and Phosphorescence of π-conjugated Polymers — •Anja Gerhard1, Heinz Bässler1, Heinrich Becker2, and Hubert Spreitzer2 — 1Institut für Physikalische Chemie, Fachbereich Chemie, Philipps Universität Marburg, 35032 Marburg — 2Covion Organic Semiconductors GmbH, Frankfurt
The spectroscopic properties of a soluble phenyl-alkoxyphenyl PPV Copolymer (Ph-PPV) and a Copolymer containing a Spiro unit (Spiro) have been studied. The studies were performed on films and in glassy matrix at low temperature (80 K). Not only prompt emission as fluorescence but also delayed emissions have been studied with the help of a gateable OMA system.
The delayed fluorescence (DF) was investigated with respect to its kinetics and intensity dependence in order to decide upon the nature of the emitting species. As geminate pairs and triplets can recombine in a delayed fashion yielding DF.
They can also be distinguished with respect to its behaviour in an electric field. An electric field was applied in the typical sandwich type structure on Ph-PPV and the quenching of the luminescences was monitored. In this case DF stems from geminate pairs. In the Spiropolymer the situation is more complex: the morphology of the film determines the origin of DF. Here we observe both types of DF.
Special attention was paid to the direct detection of the phosphorescence of Ph-PPV and the Spiropolymer. The phosphorescence of the Spiropolymer depends again on the morphology of the film.