Quest and investigation of long wavelength scintillators

The response of several luminescent materials to keV and MeV ions

“…Nonetheless, the light yield of this sample must be )11.6 · 10 3 photons MeV À1 (estimated using a/c = 1), which is considerably higher than that published for a sample with a 0.07% Ti concentration, i.e. 14% that of CsI:Tl (or $8 · 10 3 photons MeV À1 ) [34]. Other authors have shown, using relative photoluminescence measurements, that the light output increases as Ti concentration is increased before rolling-off above concentrations of $0.3% Ti [35].…”

Low-temperature spectroscopic and scintillation characterisation of Ti-doped Al2O3

“…It has been demonstrated that this material is an appealing scintillation detector for applications where operation with silicon photodiodes is required [7,8]. Furthermore there are other areas of scientific research where the implication of such findings may be of profound importance.…”

“…However, the overwhelming majority of all optical studies of Ti-doped Al 2 O 3 that focused on the use of near IR emission of Ti 3+ ions have been carried out using mainly visible and UV light [14][15][16][17][18][19][20][21]. Apart from the above-mentioned examinations of the scintillation properties of Al 2 O 3 -Ti [7,8] to the best of our knowledge there is a lack of studies analysing the luminescence properties of this material under VUV and X-ray excitation. Furthermore, since low-temperature characterisation has not been a mainstream of the scintillation studies hitherto, the emission properties of Ti-doped aluminium oxide need to be examined over a wide temperature interval.…”

Red luminescence of Lu2O2S:Ce and Y2O2S:Ce at room temperature

“…The precursor (R 1−x ,Ce x ) 2 O 3 (R = Lu or Y) was obtained by sintering the oxalate co-precipitate (R 1−x ,Ce x ) 2 and Na 3 PO 4 at a weight ratio of 100:30:30:5 was fully milled together, it was filled into a small ceramic crucible and pressed tightly, with 2-3 mm sublimed sulfur on the surface. The small crucible (50 ml) was then put into a bigger one (100 ml) with a certain amount of active carbon in it to create a reducing atmosphere when sintering.…”

“…Commonly used silicon photodiodes exhibit an efficient sensitivity in the range from 500 to 1000 nm, which generates a need for long wavelength scintillators (LWS) [1]. All Eu-and Tb-doped compounds show long decay time constants (τ) in the range of 10 2 -10 4 s [2]. So the problem is to find materials with a short decay time among the long wavelength phosphors.…”