ИСТИНА

Phosphates doped with rare-earth ions are considered as perspective materials for scintillating detectors, X-ray imaging and as phosphors in plasma display panels. Increase of the light yield is one of the most actual problems for scintillating detectors. Enhancement of the light yield can be expected for scintillators based on the solid solutions of phosphates. In the solid solutions clusters may appear. In this case the distance between the components of generic electron-hole pair is constrained and hence the probability to be captured on the emission center is increased. Actually it was shown that superior light yield is observed just for perovskite solid solutions LuxY1-xAlO3:Ce in comparison with YAP:Ce or LuAP:Ce. Also enhancement of luminescence intensity under X-ray excitation has been already detected for LuxSc1-xBO3:Ce3+ and LuxY1-xBO3:Eu3+. Here the luminescence properties of the set of phosphates solid solutions YxLu1-xPO4 (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) doped with 0,5 mol % Eu3+ or with 0,5 mol % Ce3+ were investigated. Special attention was attended to the energy transfer processes from the host states to the activator luminescence centers. Spectroscopic studies of the samples were carried out using synchrotron radiation in the energy region 3.7-22 eV at the SUPERLUMI station, DESY and using the laboratory set-up in UV spectral region. Synchrotron radiation is an ideal light source for the luminescence spectroscopy in VUV region due to its continuous spectrum, high intensity and temporal structure. Measurements were carried out at temperatures 10 and 300 K. Investigated samples were synthesized by sol-gel method.