Abstract
Green and red emissions were observed by pumping Mn-doped MgGa 2 O 4 crystals, respectively, at the band edge below 300 nm and between 300 and 500 nm. These responses are in contrast to those in the case of Mn-doped MgAl 2 O 4 . We propose a model of these luminescence channels by taking account of the smaller band gap of MgGa 2 O 4 than that of MgAl 2 O 4 , and the ESR spectrum showing Mn 2+ located at Ga-sites.
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