| Autor: |
Kononets, V., Dobrovolskas, D., Neicheva, S., Starzhinsky, N., Sidletskiy, O., Lebbou, K., Tamulaitis, G. |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Nuclear Science; Feb2014, Vol. 61 Issue 1, p343-347, 5p |
| Abstrakt: |
Confocal microscopy was exploited to study spatial distribution of luminescence characteristics in Lu_2SiO_5:Ce (LSO:Ce) and mixed Lu2xGd{2\-{2x}}SiO5:Ce (LGSO:Ce) crystals. Spatial distributions of spectrally-integrated photoluminescence (PL) intensity, PL band peak and spectral center of mass positions, and band width were determined. In both crystals, the luminescence spectra at 405 nm excitation are dominated by one broad band peaked at \sim510~\nm, while a long-wavelength shoulder is also observed in LGSO:Ce. Spatial inhomogeneities of the order of 1-3 micron in diameter are observed for the band position in LGSO:Ce. A comparative analysis of the spectra shows that the inhomogeneity is caused by spatial distribution in the spectral component at 500-700 nm, which may be attributed to Ce^3+ located in CeO6 polyhedra (Ce2), or, more probably, to some defects in the crystal. Our results indicate that the changes in luminescence spectrum shape reflect Lu/Gd ratio fluctuations on a micrometer scale in the bulk of the mixed LGSO:Ce crystals. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
