Abstract
The possibility of obtaining scintillators with a high effective atomic number of the element Z ef based on Lu3Al5O12:Ce3+ single‐crystal films (SCF) on doping with La3+ and Sc3+ ions on Y3Al5O12 substrates has been investigated. It is established that the SCF of (LuLaY)3Al5O12:Ce3+ (Z ef = 58.9 and ρ = 6.67 g/cm2) does not rank below those of Y3Al5O12:Ce3+ (Z ef = 29 and ρ = 4.52 g/cm2) in the conversion efficiency of radiation at the band with λmax = 515 nm. This allows their use as screens of x‐ray images with a space resolution of 0.75–1.00 μm. It is suggested that in the SCF of Lu3Al5O12 the isoelectronic impurities of lanthanum and scandium form radiative recombination centers of the type LaLu, ScLu, and ScAl as well as the centers Lu as a consequence of the effect of replacement of some Lu3+ ions by the La3+ ions to octanodes of the garnet lattice. The low efficiency of Ce3+ radiation in the SCF of (LuSc)3(AlSc)5O12:Ce is explained by substantial losses due to excitation of the recombination luminescence in the UV region of the centers formed by the isoelectronic impurities of scandium and to the possible existence of the channel of energy excitation dissipation related to the transitions between extrema of the allowed energy bands and activator levels.
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Zorenko, Y.V., Konstankevich, I.V., Gorbenko, V.I. et al. Preparation, Luminescence Properties, and Application of Scintillators Based on Lu3Al5O12:Ce Single‐Crystal Films. Journal of Applied Spectroscopy 69, 769–776 (2002). https://doi.org/10.1023/A:1021521416098
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DOI: https://doi.org/10.1023/A:1021521416098