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Luminescence of heavily Ce-doped alkaline-earth fluorides |
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| Authors: | A Gektin N Shiran Y Boyarintseva G Stryganyuk E Villora |
| Institution: | a Institute for Scintillation Materials, 60 Lenin Avenue, 61001 Kharkov, Ukraine b Ivan Franko National University of Lviv, 8 Kyryla i Mefodiya Street, 79005 Lviv, Ukraine c National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan |
| Abstract: | The spectral and kinetic parameters of M1−xCexF2+x (x=0.35, M=Ca, Sr, Ba) crystals luminescence have been studied. These characteristics are compared to the luminescence of solution base hosts: MF2:Ce and CeF3. The emission bands of heavily Ce-doped alkali earth fluorides are closed to the spectrum of perturbed Ce-center in CeF3 at T=9 K. Luminescence of M0.65Ce0.35F2.35 crystals reveals the efficient excitation in the UV and VUV ranges. The main feature of the emission and excitation spectra of Ce3+ luminescence is the displacement to the low-energy range according to the bandgap decrease in the Ca-, Sr- and Ba-based fluorides, respectively. Small Stokes shift leads to the reabsorption and light yield decrease. Luminescence peculiarities of M1−xCexF2+x solid solution and the role of Ce-enriched inclusions are discussed. |
| Keywords: | M1&minus xCexF2+x Cluster Luminescence Excitation Decay time |
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