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Morphology and chain aggregation dependence of optical gain in thermally annealed films of the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene]
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10.1063/1.4811532
/content/aip/journal/jap/113/23/10.1063/1.4811532
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/23/10.1063/1.4811532

Figures

Image of FIG. 1.
FIG. 1.

Absorption spectra of MEH-PPV films cast from THF-solution on glass as a function of thermal annealing temperature. Inset shows chemical structure of MEH-PPV. The spectra have been normalized to the maximum absorption wavelength and vertically offset for clarity. Vertical broken line is a guide to the eye. The bulk glass transition temperature,  = 70 °C.

Image of FIG. 2.
FIG. 2.

Atomic force micrographs of MEH-PPV films that were as-cast (a) and thermally annealed at 60 °C (b), 80 °C (c), and 200 °C (d) taken over a 30 m × 30 m scan area. Average surface roughness R values are provided. The bulk glass transition temperature,  = 70 °C.

Image of FIG. 3.
FIG. 3.

Low pump energy PL spectra collected from the edge of waveguides formed with THF-cast films of MEH-PPV as-cast and annealed at 60 and 80 °C with a constant pump energy density of 3 J/cm and pump stripe length of 0.1 cm. The bulk glass transition temperature,  = 70 °C.

Image of FIG. 4.
FIG. 4.

Pump energy dependence of emission spectra for MEH-PPV films that were as-cast (a) and thermally annealed at 60 °C (b) and 80 °C (c). The spectra have been normalized to facilitate comparison. PL/ASE spectra were collected from the edge of the waveguides and recorded using a constant excitation pump stripe length of 0.1 cm. The inset plots show the dependence of the PL linewidth for the 0-1 transition on the pump energy density. The bulk glass transition temperature,  = 70 °C.

Image of FIG. 5.
FIG. 5.

Dependence of the spectrally integrated, edge emitted PL intensity on pump energy density for waveguides formed with THF-cast films of MEH-PPV as-cast (squares) and annealed at 60 °C (triangles), 80 °C (circles), and 200 °C (stars). The pump stripe length is 0.1 cm. The bulk glass transition temperature,  = 70 °C. Inset plot (linear-linear scale) shows change in slope with annealing temperature at low pump energy density, prior to the ASE threshold. Solid lines are guides to the eye.

Image of FIG. 6.
FIG. 6.

Waveguide loss (a) and AFM average surface roughness (b) of MEH-PPV films showing the same functional dependence with anneal temperature. Error bars represent 2× the standard error.

Image of FIG. 7.
FIG. 7.

Excitation stripe length dependence of the edge emitted peak intensity at for waveguides formed with THF-cast films of MEH-PPV as-cast (squares) and thermally annealed at 60 (triangles) and 80 °C (circles). The pump energy density is 30 J/cm. The fitting to Eq. (3) is given by the solid lines. The data are plotted on a logarithmic-linear (a) and linear-linear (b) scale to clearly make visible the saturation and threshold stripe length regimes, respectively. The inset shows the normalized PL spectra for the as-cast film collected at three different stripe lengths with a pump energy density of 30 J/cm. The threshold excitation length is indicated for the as-cast film. The bulk glass transition temperature,  = 70 °C.

Image of FIG. 8.
FIG. 8.

Net gain coefficient as a function of pump energy density for waveguides formed with as-cast and thermally annealed MEH-PPV films. The bulk glass transition temperature,  = 70 °C. Error bars represent 2× the standard error.

Tables

Generic image for table
Table I.

Optical parameters of MEH-PPV waveguides; is the thermal annealing temperature, the threshold pump energy density, the maximum excitation density at threshold, g the maximum measured net gain coefficient, and the PL slope efficiency at low pump energy density which is proportional to , the PL yield.

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/content/aip/journal/jap/113/23/10.1063/1.4811532
2013-06-19
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Morphology and chain aggregation dependence of optical gain in thermally annealed films of the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene]
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/23/10.1063/1.4811532
10.1063/1.4811532
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