Selective laser excitation of the luminescence of a thin film of the r
r-conjugated polymer poly(p-phenylene) at room temperature is achieved
. Monochromatic excitation is selective only for excitation in the lon
g-wavelength wing of the absorption spectrum. This is manifested as a
shift of the luminescence spectrum with excitation frequency. The expe
rimental results are interpreted on the basis of model calculations. (
C) 1995 American Institute of Physics.