EFFECTS OF 60Co GAMMA IRRADIATION UPON YVO4, YVO4:Eu(3+), AND YVO4:No(3+).
NORTH CAROLINA STATE UNIV RALEIGH PHYSICAL SCIENCE RESEARCH
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The absorption and fluorescent spectra of single crystals of YVO4, YVO4Eu3 are discussed and illustrated, and the effects of 60Co gamma irradiation upon the spectra are presented. Irradiation produced similar changes in the absorption coefficient of these crystals. Small center bands were formed in the ultraviolet and visible regions. The intensity of the fluorescent emission form both YVO4 and YVO4Eu3 was decreased by irradiation, while the emission intensity of YVO4Nd3 was not affected. Speculations about the nature of the mechanisms producing the irradiation effects discussed. Gamma irradiation produces ionization in crystals, and some of the free electrons and holes created become trapped at lattice defects. The changes in emission and absorption in the YVO4 crystals are interpreted as due to the trapped holes and electrons. Author
- Radiation and Nuclear Chemistry
- Solid State Physics