Abstract
The luminescent properties of Mn-activated CdCl2, CdBr2, CdI2, and CaI2 crystals are studied in the range 4.2-200 K. The photo- and roentgenoluminescence spectra of the crystals show red emission bands due to the Mn activator. The excitation spectra and Mn luminescence kinetics are interpreted in terms of the crystal-field theory with consideration for electron paramagnetic resonance data. The red luminescence of the crystals at 4.2 K is attributed to the 4 T 1g(4 G) → 6 A 1g(6 S) electron-phonon transitions of Mn2+. The Racah parameters B and C are determined. The origin of the 600-nm luminescence in CdBr2:Mn2+ under excitation with a nitrogen laser and xenon lamp at 320-360 nm in the range 4.2–90 K is discussed.
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