Calcination of a scandiutn-O-phenylene-O-yttrium-O-phenylene hybrid copolymer under an argon atmosphere at 400-800 degrees C was performed. The calcined materials were found to be composed of nano-sized Sc2O3 and Y2O3 particles in the matrix of carbon clusters. ESR spectral examinations of the calcined materials suggest that a two-step electron transfer of Y2O3 -> carbon clusters -> Sc2O3 -> carbon clusters took place to provide a photo-responsive oxidation-reduction function with an oxidation site at Y2O3 particles and a reduction site at carbon clusters.