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1 December 1997 Raman scattering gain in DOO-PPV films
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We have investigated the optical emission characteristics of poly(2,5-dioctyloxy-p-phenylenevinylene) (DOO-PPV) thin films under high intensity ps pulsed laser excitation (Ipump > 1 MW/cm2). We observed that the emission spectrum consist of a spectrally narrowed emission (SNE) band (FWHM approximately 10 nm) and superimposed sharp spectral lines. High resolution spectral measurements conducted at room and liquid nitrogen temperatures show that the spectral width of these lines is less than 1 nm. The lines peak positions are independent of film thickness, however, they shift upon changing the excitation wavelength. Also, the excitation intensity dependence of these narrow lines is found to be different from that of the SNE band. We argue that the narrow lines are due to Raman scattering gain of the 1st, 2nd and 3d order Raman active modes of DOO-PPV.
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Maxim N. Shkunov, Werner Gellermann, Akihiko Fujii, Katsumi Yoshino, and Z. Valy Vardeny "Raman scattering gain in DOO-PPV films", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997);

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