A study of the effect of dopant incorporation on the growth of InGaP by low pressure metalorganic chemical vapor deposition has been performed, in which diethylzinc (DEZn) and H2Se are used as p and n-type doping sources, respectively. The enhancement of interdiffusion, i.e., the disordering of a InGaP layer has been observed due to the introduction of Zn into the growth layer, as indicated by the decrease of intensity of the extra spots on TEM diffraction results. In addition, streaky and wavy diffraction pattern for Se-doped layer reveals the formation of anti-phase domains on a growth layer. According to PL measurement, the emission energy of the grown layer is a function of doping concentration, for which the energy shift as high as 141 meV has been obtained at heavily zinc doping concentration. Therefore, by varying the doping concentration, energy shift can be controlled, providing a potential for its application in optical devices.