Photoluminescence behavior of Eu doped XAlO(X = Mg, Ca, Sr and Ba) phosphors: a comparative study.

In this work, the Eudoped stuffed tridymite type structure of alkaline earths aluminate i.e. XAlO(X = Mg, Ca, Sr and Ba) phosphor materials have been synthesized by conventional high temperature solid state reaction method at 1623 K. The Samples were structurally and morphologically characterized by x-ray diffraction (XRD) and Scanning electron microscope (SEM) measurements. The vibrational behavior of the phosphor samples were investigated by Fourier transform infrared (FTIR) measurements. The phosphor samples emit intense red emission in 610-615 nm range due toD → Ftransition of Euion on excitation with charge transfer band (CTB) wavelength arising due to Eu-Oand also by the discrete bands of Euions .The decay time ofDlevel of Euion were recorded on excitation with 393 nm and by the CTB wavelength for all the four samples. The optimized 1 mol% Eudoped CaAlOphosphor exhibits optimum emission intensity and color purity under the excitation with 393 nm than others. The decay time is also found to be larger in the case of Eudoped CaAlOphosphor sample. Therefore, Eudoped CaAlOphosphor may be promising material for red color light emitting applications and white light generation.