Luminescence properties and energy-transfer behavior of Y(2-x-y)Bi(x)Eu(y)MgTiO(6) phosphors

In recent years, double perovskite has become a research hotspot of luminescent matrix materials due to its flexible structure, easy doping and good thermal stability. By using a high temperature solid-state technique, Bi(3+) and Eu(3+) co-doped Y(2-x-y)Bi(x)Eu(y)MgTiO(6) (0 ≤ x ≤ 0.1, 0 ≤ y ≤ 0.5) phosphors were made. X-ray diffraction (XRD) analysis shows that the crystal structure of all samples is monoclinic system, P2(1)/n; Bi(3+) and Eu(3+) can be doped into the position of Y(3+) in the substitution system of Y(2)MgTiO(6). Both photoluminescence spectroscopy (PL) and X-ray excitation luminescence spectroscopy (XEL) were used to investigate the link between Bi(3+) and Eu(3+) doping concentrations and luminescence intensity. PL shows that: When 375 nm is used as the excitation wavelength, by varying the doping concentration of Eu(3+) in the Y(1.995-y)Bi(0.005)Eu(y)MgTiO(6) phosphor, it is possible to create the color-tunable emission from blue to red; The introduction of an appropriate amount of Bi(3+) will increase the typical Eu(3+) emission; The way that the system's Bi(3+) and Eu(3+) exchange energy can be observed by combining the fluorescence decay curve and photoluminescence. Fitting by concentration quenching model shows that the resonant dipole-dipole transition is the mechanism of energy transfer between Bi(3+)→Eu(3+); X-rays may successfully stimulate the phosphor, and the spectral distribution of XEL and PL is basically the same; The introduction of an appropriate amount of Bi(3+) is also beneficial to improving the sensitivity of XEL; Changes in temperature affect the sample's emission intensity; In addition, the samples remain stable for an extended period while being continuously exposed to X-rays at various environmental temperatures. The a forementioned findings suggest that the phosphor has potential use value in the lighting industry, X-ray imaging and temperature sensor.