Modern Luminescence Spectroscopy of Minerals and Materials

Comparative study of radiation-induced damage in magnesium aluminate spinel by means of IL, CL and RBS/C techniques

“…2b), although the relative intensities of the bands are different from the CL spectra. The emission of ~700 nm band present on both, CL and IL spectra, is assigned to the Cr 3+ luminescent centers in spinel, where Cr 3+ appears as a trace constituent substituting Al 3+ (Gaft et al 2005). The values of the intensity of luminescence bands defined as the band area (integrated intensities) were extracted from each spectrum recorded using CL and IL techniques.…”

STRUCTURAL AND PHOTOLUMINESCENCE CHARACTERIZATION OF MgAl2O4:Eu PHOSPHOR SYNTHESIZED BY COMBUSTION METHOD.

“…In most Eu 2+ activated phosphors, the lowest level of the 4f 6 5d configuration lies below the 6 P J state, leading to broadband luminescence due to the inter-configurational electronic 4f 6 5d -4f 7 ( 8 S 7/2 ) transition [12]. On excitation with UV, two types of lowest excited states are possible, namely 6 P j (f-f) or 4f 6 5d (f-f), depending on the host matrix [13]. In case of Eu 2+ ion in MgAl 2 O 4 the possible lowest excited states is 4f 6 5d (f-f) [5].…”

Time-resolved optically stimulated luminescence and spectral emission features of α-Al2O3:C

“…However, since the size of Cr, at 0.63 Å, is much larger than that of Al, at 0.51 Å, the substitution distorts the structure of the host. The emission can be discussed with reference to a configurational coordinate diagram of a Cr 3+ cation in a site of high crystal strength, relevant in this discussion [1,51]. The emission spectrum of Cr 3+…”

“…A detailed explanation of non-radiative transitions in terms of such diagrams is given elsewhere e.g. [1,2,[51][52][53] hence only a brief qualitative account of specific results in this work is given here.…”