Function of spinel related phosphors and its application

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The purpose of this project is to examine the material design of novel phosphors for VFD (Vacuum Fluorescence Display) with high fluorescence intensity from a viewpoint of structural low-dimensionality such as magnetoplumbite structure etc. Generally, a luminous phosphor for VFD should be requested to keep some electric conductivity owing to the prevention of some space charges. In this context, we also investigated the fabrication of novel pyrochlore type oxides which consisted of rare earth metals as luminous centers and host lattice with Ti^<4+> and Sn^<4+> ions being semiconductive.As a result, we succeeded to make novel phosphors in the solid solution of Eu^<3+> and Pr^<3+> pyrochlores for VFD. The resulting compounds were identified as single phase of pyrochlore and observed the intense emission by a cathodeluminescence technique after adjusting the suitable concentration of luminous center ions.On the other hand, CaAl_2B_2O_7;Eu^<2+> phosphor was newly synthesized as PDP's (Plasma Display Panel's) use. According to the XRD data, the structure was precisely determined to a layered spinel structure with BO_3 and AlO_4 blocks which were more available for the 147nm-excitation(i.e., Xe gas excitation).