In this communication we present recent results of photoluminescence (PL), photo-ESR and optically detected magnetic resonance (ODMR) studies, performed on series of crystals: ZnO, ZnO:Mn, ZnO:Co, ZnO:Fe, ZnO:Ti, ZnO:Cr and ZnO:Cu. All samples were grown by chemical vapor transport technique and were doped with transition metal impurities into the melt.
We focused on the comparison of optical and magnetic properties of various crystals with different composition and doping level. In particular we discuss influence of doping with transition metal impurities on PL and magnetic resonance spectra. We found that two of the TM ions studied (Cr and Co) we found that TM is present in two charge states: 2+ and 3+, respectively.. Both impurities can be recharged with light of appropriate energy and such recharging processes we monitored by observing their in ESR signals.
Moreover, we found that ZnO:Mn crystals with Mn fraction up to 5% exhibit a week ferromagnetic behavior at low temperatures.

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