Electron traps and transfer efficiency of cerium-doped aluminate scintillators

Thermoluminescence and Scintillation Time Profiles of BaF2:Ce

“…Kn, 78.60.Ya, 78.55.Hx, 29.40.Mc Thermoluminescence provides a useful tool for studying host-to-ion energy transfer and the role of traps in scintillator materials. While it is generally accepted that deep traps, revealed by high-temperature thermoluminescence (htTL, 300 K and higher) can reduce the scintillation light yield of any scintillator material [1,2], the importance of shallower traps has only recently been recognized [3][4][5]. Although their glow peaks fall at temperatures well below ambient, such shallower traps can introduce slow components in both the rising and decaying parts of the scintillation time profiles and reduce the scintillation light yield at room temperature (RT).…”

Charge Traps in Ce-Doped CaF2and BaF2

“…The additional presence of Ce 3 + d -f luminescence in TL emission spectra has been explained by radiative energy transfer from the e-+ VK recombination to Ce 3 + ions. In disagreement with Ratnam and Banerjee [6], tetragonal Ce 3 + ions have been excluded from contributors to TL of CaF2:Ce. Shi et al [14] have studied the temperature dependence (in the range from 10 to 350 K) of the excitonic luminescence decay time in BaF2.…”

“…With the papers of Bartram et al [6] and Wojtowicz et al [7,8] (251) the properties of scintillators has appeared. One of the important conclusions of these papers is the responsibility of electron traps for the 35% light loss in LuAl03:Ce, comparing to its analogue YAl03:Ce.…”

Final Report: Scintillator Materials for Medical Applications, December 1, 1997 - November 30, 1999

“…In the past year, we have investigated the relationship between scintillation and thermoluminescence over a considerably broader range of conditions, finding dramatic connections heretofore unknown [5,6]. The first new development was revealed by greatly expanding the temperature range.…”

“…With the advice and participation of our consultant, Prof. R. H. Bartram, an ingenious experiment was set up at the University of Connecticut in Storrs [5]. In this experiment a steady-state gamma beam derived from a van de Graaff generator was directed at a scintillator sample, whose emission intensity was measured.…”