Inhomogeneous broadening of the luminescence in

Abstract

Five absorption bands with peaks at , 246 nm, 284 nm, 296 nm, and 368 nm were observed at room temperature for Ce-doped (CYA) crystals grown in a reducing atmosphere. Excitation at wavelengths below of Ce:CYA crystals produces a broad luminescence band with a peak at . The excitation spectrum of the luminescence detected at a fixed wavelength of 485 nm is very similar to the absorption spectrum. The ultraviolet absorption and visible luminescence are due to the transitions of ions in CYA. The linear dependence of the luminescence peak energy on the excitation energy shows that the luminescence is inhomogeneously broadened by a random distribution of and ions in the disordered CYA lattice.