By correlating EPR and Optical absorption data, the evaluated bonding parameter suggested that there exists a covalent bond between the doped Co 2+ ions and its ligands. PL spectrum showed characterist ic ZnO emission bands in UV and blue regions. The evaluated CIE color coordinates indicated that this material can be used for blue light emitting devices. The formation of Zn AO bonds was also confirmed by FT-IR spectral data and showed the vibrational bands in the region of 400–600 cm 1.