1 December 1997 Photopumped gain narrowing experiments in oriented films of semiconducting polymers
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Abstract
We present experimental evidence that orientation of the polymer chains in semiconducting polymer films leads to lower thresholds for gain narrowing. Two different materials have been investigated: neat films of poly(p-phenylene vinylene) (PPV) and blends of poly(2-methoxy-5-(2'- ethyl-hexyloxy)-1-4-phenylenevinylene) (MEH-PPV) in polyethylene (PE). Gain narrowing is not observed in non- oriented films in either of the two materials. However, free-standing films of PPV drawn to a ratio of (7:1) showed gain narrowing at threshold one order of magnitude lower than typically found for non-oriented films of soluble PPV derivatives. For the MEH-PPV blends, gain narrowing is observed in diluted films with concentrations of the active polymer of approximately 1 percent. The thresholds for these dilute, but chain extended and highly oriented free standing films are comparable to those obtained in neat thin film waveguides of the same material. These result are correlated with the microstructure of the films, as investigated by x- ray diffraction.
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Maria Angeles Diaz-Garcia, Cuiying Yang, Edward Kirk Miller, Kwanghee Lee, Alan J. Heeger, "Photopumped gain narrowing experiments in oriented films of semiconducting polymers", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.284179; https://doi.org/10.1117/12.284179
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