Luminescence centers and spectrum characteristics of a novel Eu2+-activated hexa-aluminate CaZrBAl9O18



A new blue-emitting phosphor of Eu2+-activated hexa-aluminate CaZrBAl9O18 was synthesized by a conventional solid-state reaction method. The crystalline phase formation was confirmed by X-ray powder diffraction (XRD) measurements. The photoluminescence excitation and emission spectra, the luminescence decay curves and the time-resolved spectra of CaZrBAl9O18:Eu2+ were taken to investigate the luminescence characteristics. The dependence of CaZrBAl9O18:Eu2+ luminescence intensity on the Eu2+ doping concentrations was investigated. This phosphor can be efficiently excited by UV light and presents blue luminescence. There is one kind of Eu2+ luminescence center in the lattices, which was confirmed by the time-resolved luminescence spectra. The temperature-dependent luminescence intensity was measured and the activation energy (ΔE) for thermal quenching was reported. The phosphor shows high luminescence intensity and an excellent thermal stability on temperature quenching. pssa201330321-gra-0001

Eu2+-doped hexa-aluminate CaZrBAl9O18 presents bright blue-emitting luminescence with high thermal quenching; only one Eu2+ center was confirmed in this hexa-aluminate lattices.