Synthesis and effects of co‐dopants (La³⁺, Sm³⁺, Mn²⁺, Nd³⁺, V⁵⁺, Y³⁺) on photoluminescence of SrAl₂O₄:Dy³⁺ phosphor

Abstract

In this research, the co-dopant effects on photoluminescence (PL) properties of SrAl 2 O 4 :Dy 3+ phosphors were studied. The phosphor powders were prepared with solid state reaction, which is the method that is frequently preferred in SrAl 2 O 4 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 2 O 4 that was synthesized with the addition of boron, and then continued with the doped/and co-doped samples. Except for the Sm 3+ co-doped phosphor, PL data of characteristic Dy 3+ transitions were obtained for other lanthanide and metal ion co-dopants. The strongest PL intensity was demonstrated in the SrAl 2 O 4 :Dy 3+ ,V 5+ . SrAl 2 O 4 :Dy 3+ ,Sm 3+ phosphor shows both the Dy 3+ and Sm 3+ ions transition related peaks appeared in the same spectrum. In the continuation of the studies, SrAl 2 O 4 :Dy 3+ ,Sm 3+ and SrAl 2 O 4 : Dy 3+ ,V 5+ powders were immersed in water for 2 h. Regardless of the presence of Dy 3+ 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 2 O 4 .

Fixed Yellow-to-Blue Intensity Ratio of Dy3+ in KY(CO3)2 Host for Emission Color Tuning

“…The double-exponential fitting curve indicates that two main factors are dominating the radiation process of Dy 3+ . In general, the lifetimes vary with different concentrations due to the energy transfer between the Dy 3+ ions [ 35 ]. Therefore, a constant concentration of Dy 3+ was used to investigate the contribution of Ce 3+ .…”

The Effect of Trivalent Ions on Luminescent Properties of SrAl2O4:Eu2+, Dy3+ Phosphors

“…Since the mechanization of the long afterglow luminescence of SADED is not conclusive, it is difficult to improve luminous performance according to requirements [2][3] , It is generally believed that the long afterglow luminescence mechanism of SADED is related to the defects in the system, and by altering the type and concentration of capture centers through doping with the other ions can reform the long afterglow properties of the materials. Doping ions in the lattice will not only produce traps, but play the roles of the luminescence center and energy transfer center, which could affect the luminescence performance of the system, so the study of SADED system doped with the unlike ions is a meaningful project [4][5][6][7][8] .…”