Low-temperature luminescent properties of Mn-activated layered cadmium and calcium halides

Abstract

The luminescent properties of Mn-activated CdCl 2 , CdBr 2 , CdI 2 , and CaI 2 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 1 g ( 4 G ) 6 A 1 g ( 6 S ) electron-phonon transitions of Mn 2+ . The Racah parameters B and C are determined. The origin of the 600-nm luminescence in CdBr 2 :Mn 2+ under excitation with a nitrogen laser and xenon lamp at 320-360 nm in the range 4.2-90 K is discussed.

One-step synthesis of nail-like Mn-doped CdS/CdBr2 hetero-nanostructures for potential lasing application

“…A strong and broad near IR emission peak centered at 766 nm can be observed. The luminescence of Mn activated cadmium halide crystals, peaked in the IR spectral region, is commonly attributed to electron-phonon transitions in Mn 2+ -related centers [48]. This is similar to the fluorescence energy transfer from free exciton to the Mn(II) dopants as that in Mn-doped CdS/ZnS nanocrystals [49,50].…”

Investigations of the electron paramagnetic resonance parameters and defect structures for Ni2+ ions in CdX2 (X=Cl, Br) crystals

“…Due to the relative ease of growth of large single crystals as well as the good dielectric and transparency properties, they are often used as host lattices in various studies such as optical and electron paramagnetic resonance (EPR) spectra of transition-metal ions [2][3][4][5][6][7][8]. The EPR spectra of Ni 2+ ions in CdX 2 crystals were measured [7,8] and their EPR parameters (g factors g J , g ?…”