INVESTIGATION OF LUMINESCENCE PROPERTIES OF PURE AND Ce~(3+) DOPED Y_3Al_5O_(12) CRYSTALS USING VUV RADIATION

摘要

Spectral-kinetic investigation of the excitation of intrinsic and impurity was carried out for Ce~3 doped Y_3Al_5O_(12) and pure Y_3Al_5O_(12) crystals in the temperature range 8 - 300 K using synchrotron radiation of 4-36 eV. The decay kinetics (in nanosecond scale) of intrinsic and impurity emission was studied as well. The spectra of intrinsic emission excitation by 6-36 eV photons in Y_3Al_5O_(12) (emission at 5 eV), YAlO_3 (5.9 eV), Al_2O_3 (7.6 eV) and Y_2O_3 (3.4 eV) are compared. The small value of the relative Stokes shift at the self-trapping of excitons indicates that a hole component of excitons becomes localized at single oxygen ions.