In this work, light-induced interactions among commercially available green and yellow garnets and wide range opto-emitters of ZnO and CuO have been investigated in terms of excitation, emission and decay kinetics. When the lutetium aluminum garnet (LuAG: Ce3+) is encapsulated along with the nanocrystalline metal oxides in a polymethylmethacrylate (PMMA) matrix, the absorption and emission efficiency of the phosphor enhanced 59-fold compared to its additive-free form. Similarly, when yttrium aluminum garnet (YAG: Ce3+) was incorporated with ZnO and ZnO-CuO nanoparticles, the composites exhibited 6- and 4-fold enhancement in the emission intensities, when excited by the blue light. In parallel to the emission intensities, the external quantum yield (EQY) of LuAG:Ce3+-ZnO-CuO enhanced from 88.4 to 116.4%, with respect to the additive-free-LuAG:Ce3+. Similarly, in YAG:Ce3+ based samples, the presence of the ZnO in the composite resulted in the enhancement of the EQE from 80.6 to 98.1.