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The ab initio generalized gradient approximation (GGA)+U study of multiferroic (La0.5Bi0.5)2FeCrO6 in pnma structure and ferri-magnetic order,including Hubbard corrections (U =4.1 eV) for transition metal/rare earth d-electrons with 20 atoms cell,shows optimum local magnetic moments of (Cr3+,Re3+) equal to (-2.56,4.14)μB and an ideal spin-down band gap of 1.54eV.Tuned-band gap La-substituted double oxide perovskites BFCO should exhibit enhanced visible-light absorption and carrier mobility,thus could be convenient light absorbers and then efficient alteatives to wide-gap chalcopyrite absorber-based solar cells failing to achieve highest power conversion efficiencies,and even compete with their metal-organic halide perovskites counterparts.