HOMOGENEOUS AND INHOMOGENEOUS LINEWIDTHS OF EU3+ IN DISORDERED CRYSTALLINE SYSTEMS

The role of disorder on the inhomogeneous and homogeneous linewidths o f Eu3+ in, single crystals with various degrees of disorder is describ ed for samples grown by LHPG (laser-heated pedestal growth). Emission spectra, hole-burning spectra, and results of the two-pulse photon ech o are reported for Y2-xScxO3 (x=0.04,0.3,1) and YSZ (yttria-stabilized zirconia). For the Y2-xScxO3 system, the inhomogeneous liinewidths in crease with x while the homogeneous linewidths are nearly independent of x. Dynamics associated with low-frequency excitations observed prev iously in x=0 LHPG samples are nearly absent for x>0. However, both th e static and dynamic properties of YSZ show behavior which is characte ristic of amorphous systems like silicate glass.