PbMoO₄:Co (0.2 mol. %, 0.5 mol.% and 1 mol.%) single crystals have been prepared by Czochralski method. They were investigated by electron paramagnetic resonance (EPR)and photoluminescence (PL) in a wide temperature range of 3-300 K. EPR investigations of oriented single crystal samples show clear signals with hyperfine structure due to Co²⁺ ions with a spin S=3/2, vanishing over 35 K. Temperature dependence of double integral of EPR signal obeys the Curie-Weiss law. Some discrepancies, however, are observed above5 K, suggesting the presence of internal magnetic fields due to e.g. clusters. It reveals low ferromagnetic interactions with Curie-Weiss temperature estimated as 1.8 and 2.8 K at 0.2 and 0.5 mol % Co up to 10K, respectively. Above 10K the magnetic phase changes to antiferromagnetic phasewith Curie-Weiss temperature of about -12 K.

The PL spectra show a broad band in a range from 400 to 700 nm.

We observed blue PL emission due to electronic transitions within the isolated [MoO₄] tetrahedron groups and green emission due to extrinsic transitions caused by the defects or impurities. Temperature dependence of PL spectrum shows ananomaly in a range of 100-200 K, indicating a structural phase transition at about 175 K.

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