화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.147, No.7, 2800-2804, 2000
Luminescent properties of YNbO4 : Bi phosphors
Yttrium niobate doped with Bi was prepared using a solid-state reaction technique and its luminescence behavior was investigated under ultraviolet and low-voltage electron excitations and with the first-principle calculations. The optimization of the photo- and cathodoluminescent properties was studied with control of Bi amounts and Y/Nb ratios. It was found that the luminance of YNbO4:Bi phosphors depends on the calcining conditions, Bi content, and particularly on the Y/Nb ratio. 0.2 wt % Bi3+-doped YNbO4 phosphors with a Y/Nb ratio of 52/48 showed the maximum emission intensity. The luminescent properties of YNbO4 and YNbO4:Bi phosphors were interpreted with the calculated density of states (DOS) using density functional theory. From the calculated DOS, we were able to explain the charge transfer gap in the host and the effect of Bi in the excitation and emission spectra.