A novel method of loading phosphor materials in plastic scintillators (here on PS) is demonstrated in this work. ZnS(Ag) and ZnO phosphor materials are integrated into thin PS medium to exploit high Z and phosphor characteristics of these materials in radiation detection. These PS are prepared using polystyrene as base, xylene as solvent, PPO and POPOP as primary and secondary flours and phosphor as an additional luminescent material to 250±30µm thickness. The synthesized composite PS are studied for characterization of photoluminescence, radioluminescence, energy transfer phenomenon in composite PS and their detection efficiencies for common alpha, beta, gamma and neutron sources. The results obtained showed there is a notable increase in the performance of the phosphor loaded PS compared to that of bare PS. The performance for gamma radiation detection in these PS has been enhanced without degrading actual light yield. The results obtained are also compared with that of commercially available PS.