Abstract
Binary alkali-earth silicate glasses doped with Ce3+, Tb3+, and Dy3+ were obtained by melt-quenching technique and their photo- and radio-luminescence properties were investigated. The disordered structure of the glass is responsible for an inhomogeneous broadening of the electronic radiative 5d1 energy level of Ce3+ due to their localization in several positions with different surroundings, possessing a slightly different local ligand field. The influence of glass matrix composition on the Stokes shift as a function of ionic radius of the cation was shown. The radio-luminescence spectral shapes were related to the simultaneous occurrence of emissions from all Ce3+ configurations with relative weights proportional to their abundance in the glasses. The possibility of excitation of Ce3+ in different localizations was demonstrated and confirmed by the systematic shift of emission from excitation. On the contrary, no shift was observed in the Tb3+ and Dy3+ doped glasses, thanks to the lower effect of ligand field on their radiative electronic levels.
Highlights
Nowadays, single crystals are the most widely used materials in scintillation detectors [1,2]
We previously demonstrated that 3CaO-2SiO2 glasses, doped with Ce3+ ions, may be useful as wavelength shifters for UV emitting CeF3 single crystalline scintillator [27]
The differences of the alkali-earth metals ionic radii lead to the formation of polyhedrons with different sizes giving rise to different local fields experienced by the RE ions
Summary
Single crystals are the most widely used materials in scintillation detectors [1,2]. Active research is conducted on other material forms like glasses, ceramics, or glass ceramics [3,4,5]. These allow realization of specific compositions and shapes that would be hardly reachable by single crystal growth. In past years the possibility to obtain SiO2–based fibers [6,7], BaO-2SiO2:Ce (DSB:Ce) [8,9], Li2O-2SiO2:Ce (DSL:Ce) [10,11] and Li2O-2SiO2:Tb (DSL:Tb) [12] glasses with high scintillation efficiency was demonstrated. A number of problems are limiting the progress especially in the area of silicates [12]
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