Site Selective Luminescence and Phase Transition of a PDP Phosphor LT-GdBO_3:Eu

The PDP phosphor, LT-GdBO3:Eu, was prepared by a sol-gel process. Some conventional experiments, such as XRD, Raman spectrum, and photoluminescence spectra, were given to study its crystal structure and optical properties. When a dye laser system was used, emissions from 5Do levels of Eu3+ ions at two different sites were easily distinguished. The site symmetries were analyzed by the emission spectra, and factors that affectted the energy transfer were also investigated. When the sol-gel sample was sintered at 1100℃, a phase transition to the Vateritetype GdBO3 occured, with an absorption of heat which was mainly caused by the realignment of the lattice. The sol-gel samples had quite strong luminescent intensity. And, at the same time, the quenching concentration was as high as 20mol%.