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Proceedings Paper

Oligofluorene derivative in a host-guest system with a red-emitter: molecular packing effect on the host bimolecular recombination and guest ASE threshold reduction
Author(s): Juan Cabanillas-Gonzalez; Stefano Toffanin; Raffaella Capelli; Ken-Tsung Wong; Michele Muccini
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Paper Abstract

The dynamics of triplet recombination in fluorene trimers have been studied using steady state photoinduced absorption (PA) spectroscopy. We investigated two type of oligomeric films, deposited by different techniques: thermal evaporation and spincoating. The different molecular arrangement in both films is manifested in a red-shift of the absorption, PL and T1-Tn triplet PA spectra of the sublimated film relative to the spincoated one. Triplet recombination dynamics follow a dispersive bimolecular recombination model away from the trap filling regime. Moreover we report on the characteristics of a host-guest lasing system obtained by co-evaporation of the most promising oligofluorene derivative (T3) with the red-emitter 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran dye (DCM). The blend satisfies the necessary condition for an efficient Förster energy transfer to take place from T3 matrix to DCM molecules.

Paper Details

Date Published: 2 September 2008
PDF: 5 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510T (2 September 2008); doi: 10.1117/12.795873
Show Author Affiliations
Juan Cabanillas-Gonzalez, IFN-CNR, ULTRAS-INFM, Politecnico di Milano (Italy)
Stefano Toffanin, Istituto per lo Studio dei Materiali Nanostrutturati, CNR (Italy)
Raffaella Capelli, Istituto per lo Studio dei Materiali Nanostrutturati, CNR (Italy)
Ken-Tsung Wong, National Taiwan Univ. (Taiwan)
Michele Muccini, Istituto per lo Studio dei Materiali Nanostrutturati, CNR (Italy)

Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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