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We study the effect of spatially dependent mass functions over the solutionof the Klein-Gordon equation in the (3+1)-dimensions for spinless bosonicparticles where the mixed scalar-vector Coulomb-like field potentials andmasses are directly proportional and inversely proportional to the distancefrom force center. The exact bound state energy eigenvalues and thecorresponding wave functions of the Klein-Gordon equation for mixedscalar-vector and pure scalar Coulomb-like field potentials are obtained bymeans of the Nikiforov-Uvarov (NU) method. The energy spectrum is discussed fordifferent scalar-vector potential mixing cases and also for constant mass case.

Exact Klein-Gordon equation with spatially-dependent masses for unequal scalar-vector Coulomb-like potentials