Preparation, structure analysis and photoluminescence properties of MgGa2O4:Mn2+

Spectroscopic and crystal field studies of LiAlO2:Mn2+ single crystals

“…Such a value agrees with recently reported values for Mn 2+ in tetrahedral positions in MgGa 2 O 4 (784-798 cm −1 [37]). As it can be anticipated, 10Dq for Mn 2+ in a tetrahedral complex is smaller than in an octahedral complex (933-968 cm −1 [37]).…”

“…The Racah parameters B and C were estimated from the barycenters of the energy levels arising from the 4 G term (four states: 4 T 1 , 4 T 2 , 4 E, 4 A 1 ) and 4 D term (two states: 4 E, 4 T 2 ). They turned out to be (in cm −1 ) B = 702 and C = 2941; the Trees' correction constant˛= 85 cm −1 is within the typical range of this constant for Mn 2+ reported in the literature (from 76 cm −1 [36] to 181 cm −1 [37]). The calculated energy levels are shown in Fig.…”

Synthesis and luminescent properties of magnesium gallate spinel doped with Mn2+ and Eu3+ ions

“…The band at 505 nm, as it is shown in [7], corresponds to 4 T 1 → 6 A 1 transitions of Mn 2+ ions. However, it is more possible that this emission band has complex Absence of symmetry center of Eu 3+ ions 4f orbitals leads to transfusion with opposite orbitals, which results in the appearance of electric dipoles and transitions between them.…”

“…CTB corresponds to charge transfer from O 2-to Eu 3+ ions [13,14]. An inflection around 318 nm appropriate to 7 [4,14].…”

“…Much attention has been given to AB 2 O 4 (A = Mg, Zn; B = Ga, Al) doped with transition metals, for example, manganese ions. Manganese is a well known activator with a bright emission in "green" (oxidation state 2+, a band with maximum at 505 nm) and "red" (oxidation state 4+, a band with a maximum around 640 nm) spectral regions [2,7].…”