Photoluminescence of the Cr3+ ions in α-ZnAl2S4:Cr single crystals

Broussell, I.; Fortin, E.; Kulyuk, L.; Попов, С. М.

doi:10.1016/0038-1098(96)00314-6

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The Cr-doped ZnAl 2 S 4 single crystals were grown by a closed tube vapour transport with iodine agent method [16]. The Cr content was estimated from the magnetic susceptibility measurements [14] to be about 0.1 at.%.…”

Section: Experimental Techniquementioning

confidence: 99%

“…It is expected that a relatively small lattice constant should result in a strong crystal field for the Cr 3+ ions in the octahedral sulfur environment of the ZnAl 2 S 4 compound [14]. ZnAl 2 S 4 has an indirect band gap E g = 3.42 eV at room temperature, and the optical properties of ZnAl 2 S 4 crystal have been investigated by various techniques (luminescence, photoluminescence, infrared reflectivity, Raman scattering) to explore prospects for possible solid-state laser applications [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Electron paramagnetic resonance study of ZnAl₂S₄spinel

Güner

Yıldız

Rameev

et al. 2005

J. Phys.: Condens. Matter

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Single crystals of ZnAl(2)S(4) spinel doped by paramagnetic Cr(3+) and Mn(2+) ions have been studied by the electron paramagnetic resonance (EPR) technique. The crystal field symmetry around the impurity ions has been determined from the angular behaviour of X-band EPR spectra. The anisotropic EPR signal of the Cr(3+) ions shows splitting into 31 narrow lines due to the super-hyperfine interaction between unpaired electron spins of the chromium centres and nuclear spins of six neighbouring Al(27) (I = 5/2) ions. It has been established that the Cr(3+) ions are located at the octahedral sites in the spinel structure, and the super-hyperfine interaction results from a weak covalent bounding with the Al atoms. The EPR signals of the Cr(3+) paramagnetic centres show no fine-structure splitting due to a perfectly cubic symmetry of the local crystal field in the octahedral sites of the ZnAl(2)S(4) spinel structure. A weak EPR signal consisting of six components has been ascribed to the transitions between hyperfine levels of the Mn(2+) (I = 5/2,S = 5/2) ions located at tetrahedral sites, while the fine-structure splitting of each component could be resolved only for special orientations of the sample in the external magnetic field. The parameters of the EPR signal of both chromium and manganese centres indicate that there is an essential covalence in the ZnAl(2)S(4) spinel crystal. Very narrow linewidths (∼2 Oe) of the Cr(3+) EPR signal components point to very high homogeneity and quality of the ZnAl(2)S(4) crystals.

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Section: Experimental Techniquementioning

confidence: 99%