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Concentration dependence of amplified spontaneous emission in two oligo-(-phenylenevinylene) derivatives
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10.1063/1.1863426
/content/aip/journal/jap/97/6/10.1063/1.1863426
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/6/10.1063/1.1863426

Figures

Image of FIG. 1.
FIG. 1.

Chemical structure of two oligo-(-phenylenevinylene) derivatives with 3 (3-OPV) and 5 (5-OPV) monomer units.

Image of FIG. 2.
FIG. 2.

Experimental setup to investigate the presence of stimulated emission in the films: (1) laser; (2) inverted telescope; (3) neutral density filters; (4) cylindrical lens; (5) rectangular aperture with variable width; (6) sample; (7) optical fiber; (8) spectrometer; (9) computer. Full and dashed lines correspond to rays that are in perpendicular planes and limit, respectively, the width and length of the pump stripe over the sample.

Image of FIG. 3.
FIG. 3.

Photoluminescence spectra of a PS film doped with 3-OPV (emission at ) and a PS film doped with 5-OPV (emission at ) for various pump intensities, both above ( and , respectively) and below ( and , respectively) the pump intensity threshold for the observation of spectral narrowing.

Image of FIG. 4.
FIG. 4.

Evolution of the full width at half maximum (FWHM) of the emission spectra as a function of pump intensity for PS films doped with various concentrations (wt. %) of (a) 3-OPV and (b) 5-OPV.

Image of FIG. 5.
FIG. 5.

Pump intensity threshold for the observation of spectral narrowing versus the concentration of oligomer with respect to PS (in wt. %). Thresholds are obtained from Fig. 4 as the intensities at which the FWHM decays to half of its maximum value.

Image of FIG. 6.
FIG. 6.

Optical absorption spectra for solutions and films with a varying concentration of oligomer for: (a) 3-OPV and (b) 5-OPV.

Image of FIG. 7.
FIG. 7.

The dependence of the full width at half maximum (FWHM) of the emission spectra on excitation length at the indicated pump intensities for a PS film doped with: (a) of 3-OPV; (b) of 5-OPV.

Image of FIG. 8.
FIG. 8.

The dependence of emission intensity at (for 3-OPV) and at (for 5-OPV) on the excitation length at the indicated pump intensities for a PS film doped with: (a) of 3-OPV and (b) of 5-OPV. The solid lines are fits to the data using Eq. (1) with the parameters listed in Table I. The net gains of the waveguides are determined from the fits.

Tables

Generic image for table
Table I.

Parameters obtained from fits of Eq. (1) to the data in Fig. 8.

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/content/aip/journal/jap/97/6/10.1063/1.1863426
2005-03-15
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Concentration dependence of amplified spontaneous emission in two oligo-(p-phenylenevinylene) derivatives
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/6/10.1063/1.1863426
10.1063/1.1863426
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