It is known that nickel ions doped magnesium oxide MgO:Ni²⁺ is the excellent potential as tunable infrared laser in the 1300-1500 nm. However in order to optimize MgO:Ni for the best operation and evaluate its potential, it is necessary to have data on the luminescence as a function of temperature and concentration of nickel ions.

We present results of luminescence spectra of Ni²⁺ ions for single crystals MgO and ceramics preparation from nanosized MgO:Ni. The single crystals MgO:Ni²⁺ in this investigation were grown by the chemical transport reaction methods and by melting. The ceramics MgO:Ni fabricated from nanopowders which received by evaporation of raw power in a radio-frequency plasma. The luminescence spectra with concentration of Ni c_Ni= 0,5%; 1% and 5 % single-crystals was studied in the range 460-1500 nm which includes all d-d electronic transition in ions Ni²⁺ at the temperatures from 10 to 300K. Luminescence spectra of MgO:Ni consist of three broad band. The band at 12500 cm^-1 is related to the ¹E₂(D)→³A_2g(F) electrical dipole transition, the band at 18000 cm^-1 is related to the ¹T_2g(D)→³A_2g(F) electrical dipole transition whereas the band at 8000 cm^-1 is related to the ³T_2g(D)→³A_2g(F) magnetically dipole transition. The intensity of luminescence of green and red band decreases when the temperature increases. Besides, the integral intensity of band in infrared luminescence depends strongly on the c_Ni and excitation wavelength. In the region of the concentration where we do not observe infrared luminescence of exchange-coupled of Ni²⁺ pairs, the infrared luminescence intensity does not depend on measurement temperature. At higher c_Ni can see luminescence of Ni²⁺ pairs, but where the number of the exchange-coupled pairs is relatively small, the infrared luminescence intensity of the zero-phone line for the single Ni ions remains constant below 70K and decrease exponentially above 100 K.

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