Anion-cation radical formation in a new solid film M3EH-PPV:C₁₂₀-O-PCBM blend under Xe-lamp light excitation studied by means of X-band (ν = 9.5 GHz) and K-band (ν = 24 GHz) ESR at temperatures of 77K and 120K, respectively, was reported [Konkin A., et al. Synth. Met, 160 (2010) 485]. Subsequent high frequency W-band (ν = 94 GHz) ESR data (77K) demonstrate the reproducible effect of significant dispersion contribution (D) in ESR signals for all anion radicals of studied di-fullerenes derivatives blended with M3EH-PPV and P3AT at 77 K. It is suggested that D increases in relation to the absorption (A) part due to the increasing intrinsic conductivity of the di-fullerene bulk (in S₂ sp-m D>>A) relative to the mono-fullerene ones (in S₁ sp-m D ≈ 0 ) in blends with the above listed conjugated polymers under light excitation. The obtained data are displayed by the D/A ~ F(d/δ) functional dependence, where d is the film thickness, δ ~ (σν)^-1/2 is the skin-depth and σ is the fullerene conductivity.