Synthesis and effects of co-dopants (La3+ , Sm3+ , Mn2+ , Nd3+ , V5+ , Y3+ ) on photoluminescence of SrAl2 O4 :Dy3+ phosphor.

Abstract

In this research, the co-dopant effects on photoluminescence (PL) properties of SrAl2 O4 :Dy3+ phosphors were studied. The phosphor powders were prepared with solid state reaction, which is the method that is frequently preferred in SrAl2 O4 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 SrAl2 O4 that was synthesized with the addition of boron, and then continued with the doped/and co-doped samples. Except for the Sm3+ co-doped phosphor, PL data of characteristic Dy3+ transitions were obtained for other lanthanide and metal ion co-dopants. The strongest PL intensity was demonstrated in the SrAl2 O4 :Dy3+ ,V5+ . SrAl2 O4 :Dy3+ ,Sm3+ phosphor shows both the Dy3+ and Sm3+ ions transition related peaks appeared in the same spectrum. In the continuation of the studies, SrAl2 O4 :Dy3+ ,Sm3+ and SrAl2 O4 :Dy3+ ,V5+ powders were immersed in water for 2 h. Regardless of the presence of Dy3+ 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 SrAl2 O4 .