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Optical Gain in Foerster Energy Transfer Based Organic Guest-Host-Systems

Published online by Cambridge University Press:  31 January 2011

Torsten Rabe
Affiliation:
torsten.rabe@iap.fraunhofer.de, Fraunhofer IAP, NanoPolyPhotonics, Potsdam-Golm, Germany
Sebastian Döring
Affiliation:
sebastian.doering@iap.fraunhofer.de, Fraunhofer IAP, NanoPolyPhotonics, Potsdam-Golm, Germany
Niko Hildebrandt
Affiliation:
niko.hildebrandt@iap.fraunhofer.de, Fraunhofer IAP, NanoPolyPhotonics, Potsdam-Golm, Germany
Thomas Riedl
Affiliation:
t.riedl@tu-bs.de, Technical University of Braunschweig, Institute of High Frequency Technology, Braunschweig, Germany
Wolfgang Kowalsky
Affiliation:
w.kowalsky@tu-bs.de, Technical University of Braunschweig, Institute of High Frequency Technology, Braunschweig, Germany
Ullrich Scherf
Affiliation:
scherf@uni-wuppertal.de, Universität Wuppertal, Makromolekulare Chemie, Wuppertal, Germany
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Abstract

We study the optical gain for various doping concentrations in a dye doped polymer (poly-[9,9-dioctylfluorene] with 6,6'-[2,2'-octyloxy-1,1'-binaphthyl] spacer groups (BN-PFO) doped by the stilbene dye 1,4-bis[2-[4-[N,N-di[p-tolyl]amino]phenyl]vinyl-benzene] (DPAVB)). In such a guest-host-system (GHS) the occupation of the upper laser level (dopant site) is due to Förster energy transfer (FET), which strongly depends on the donor acceptor distance and hence on the concentration of the laser dye. Therefore, the doping concentration is varied over a wide range and the gain coefficients are measured at various excitation densities to analyze the stimulated emission cross section.

For the investigated GHS maximum gain coefficients up to ∼340 1/cm were found at absorbed pump energy densities of around 50 μJ/cm2. It will be shown that the stimulated emission cross section (σ = 1.8 × 10−16 cm2) is concentration independent which is quite different to a recently investigated small molecule based GHS. These effects will be discussed considering the rate and exciton diffusion constants.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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