Abstract
MgO single crystals, doped with Ge2+ ‘mercury-like’ ions, were grown. The emission of Ge2+ centres (∼3.2 eV) can be efficiently excited at 4s2→4s4p electron transitions in Ge2+ ions (4.8–6.4 eV) as well as at the formation of electron–hole (e–h) pairs by 8–36 eV photons. The absorption of one photon of 25 or 30 eV leads to the creation of two or three e–h pairs, respectively. The thermal quenching of the emission begins at ∼500 K and follows the Mott law with an activation energy E=0.52 eV. Taking advantage of the relatively high thermal stability of Ge2+ luminescence, high temperature thermostimulated luminescence (up to 775 K) of MgO:Ge crystals has been investigated.
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