2 September 2008 Oligofluorene derivative in a host-guest system with a red-emitter: molecular packing effect on the host bimolecular recombination and guest ASE threshold reduction
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Proceedings Volume 7051, Organic Light Emitting Materials and Devices XII; 70510T (2008); doi: 10.1117/12.795873
Event: Photonic Devices + Applications, 2008, San Diego, California, United States
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.
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Juan Cabanillas-Gonzalez, Stefano Toffanin, Raffaella Capelli, Ken-Tsung Wong, Michele Muccini, "Oligofluorene derivative in a host-guest system with a red-emitter: molecular packing effect on the host bimolecular recombination and guest ASE threshold reduction", Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510T (2 September 2008); doi: 10.1117/12.795873; https://doi.org/10.1117/12.795873
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KEYWORDS
Absorption

Energy transfer

Molecules

Luminescence

Thin films

Organic light emitting diodes

Quantum efficiency

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