Title :
Energy Dissipation in Impurity DopedAlkaline-Earth Fluorides
Author :
Radzhabov, Evgeny A. ; Kirm, Marco ; Egranov, Alexandr ; Nepomnyaschikh, Alexandr
Author_Institution :
Vinogradov Inst. of Geochem., Russian Acad. of Sci., Irkutsk
fDate :
6/1/2008 12:00:00 AM
Abstract :
Excitation spectra of CaF2, SrF2 and BaF2 crystals doped by CdF2, LaF3, YF3 in the vacuum ultraviolet region were investigated at liquid-helium temperature and at room temperature. Spectra of doped BaF2 at low temperature and CaF2, SrF2 at room temperature show significant decrease of excitation intensity against those in undoped crystals while the intensities in exciton regions remain nearly the same. The common reason of the suppression of exciton emission by impurity in alkaline-earth fluorides is unradiative electron-hole recombination on impurity sites.
Keywords :
barium compounds; cadmium compounds; calcium compounds; electron-hole recombination; excitons; impurities; lanthanum compounds; strontium compounds; ultraviolet spectra; yttrium compounds; BaF2:CdF2; BaF2:LaF3; BaF2:YF3; CaF2:CdF2; CaF2:LaF3; CaF2:YF3; SrF2:CdF2; SrF2:LaF3; SrF2:YF3; energy dissipation; excitation spectra; exciton emission; impurity doped alkaline-earth fluorides; liquid-helium temperature; temperature 293 K to 298 K; temperature 4.2 K; unradiative electron-hole recombination; vacuum ultraviolet spectra; Cadmium; Charge carrier processes; Crystals; Electromagnetic wave absorption; Electron traps; Energy dissipation; Excitons; Impurities; Luminescence; Temperature; Excitons; impurity; suppression; vacuum ultraviolet;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2008.922823
