Synthesis and effects of co-dopants (La , Sm , Mn , Nd , V , Y ) on photoluminescence of SrAl O :Dy phosphor.

In this research, the co-dopant effects on photoluminescence (PL) properties of SrAl O :Dy phosphors were studied. The phosphor powders were prepared with solid state reaction, which is the method that is frequently preferred in SrAl O phosphors and efficient results are obtained in terms of PL properties. X-ray diffraction (XRD) patterns of all co-doped samples were fitted with pdf card#01-034-0379. Fourier-transform infrared (FTIR) analysis supports the phase evolution determined in the XRD results. PL examinations started with the SrAl O that was synthesized with the addition of boron, and then continued with the doped/and co-doped samples. Except for the Sm co-doped phosphor, PL data of characteristic Dy transitions were obtained for other lanthanide and metal ion co-dopants. The strongest PL intensity was demonstrated in the SrAl O :Dy ,V . SrAl O :Dy ,Sm phosphor shows both the Dy and Sm ions transition related peaks appeared in the same spectrum. In the continuation of the studies, SrAl O :Dy ,Sm and SrAl O :Dy ,V powders were immersed in water for 2 h. Regardless of the presence of Dy luminescent centers and other co-dopants, broadband and intense blue emission peak at 445 nm was recorded which is directly related to newly formed phases by the decomposition of SrAl O .