BLUE, GREEN AND RED FLUORESCENCE AND ENERGY-TRANSFER OF EU3+ IN FLUORIDE GLASSES

Solid state blue and green light sources are desirable for high densit y optical storage, color displays, optoelectronics, and medical diagno stics. In addition to the well-known red emission of Eu3+, strong gree n, blue, and ultraviolet emissions have been observed in Eu3+ doped ZB LA (57ZrF(4) . 36BaF(2) . 4LaF(3) . 3AIF(3)) and PIGLZ (43PbF(2) . 17I nF(3) . 17GaF(3) . 4LaF(3) . 19ZnF(2)) fluoride glasses. The intense c oncentration dependence of these emissions was examined with fluoresce nce and excitation spectroscopy and found to be caused by nonradiative dipole-quadrupole and dipole-dipole energy transfer between excited a nd ground state Eu3+ ions. Judd-Ofelt analysis, transfer efficiency, a nd phonon side band measurements were used to model the fluorescence, energy transfer, and gain cross section for Eu3+ in a ZBLA host.