Synthesis of an excellent red phosphor and photo luminescence studies of Eu ³⁺ activated double perovskite phosphors NaSrBi _{1- <i>x</i>} Eu _<i>x</i> WO ₆ ( <i>x</i> = 0.0–0.24)

Abstract The sodium magnesium contains double perovskite structure compound i.e. NaSrBi 1- x Eu x WO 6 is synthesized by using citrate – gel method. This double perovskite structure compound is prepared at different concentrations i.e. ( x = 0.0–0.24) at different temperatures 500, 600, 700 °C for 5 h. Further, the prepared samples are characterized through different tools like XRD (X-ray diffractro meter), UV Visible Diffuse Reflectance Spectra, Photo luminescence spectra, FE SEM and CIE Software and the prepared sample shows different structures in various concentrations by using X-ray diffractrometer. Similarly, lattice parameters, peak positions are explained for all various concentrated samples at 700 °C sintered temperature for 5 h. However, the samples which are sintered at 700 °C for 5 h are excited at different wavelengths i.e. 395, 465, 540 nm, the corresponding emission intensities are also recorded. All the concentrated samples exhibits towards high intensity peaks at 595, 614 nm wavelengths in their emission spectra. The sample x = 0.12 shows highest red emission intensity out of all concentrations in the emission spectra. 5 D 0 - 7 F 1 &amp; 5 D 0 - 7 F 2 are the major transitions formed in the emission spectra for every concentrated sample. In the same way the structural morphology is identified clearly by using FE SSEM. The CIE color coordinators are calculated and identified as very close to NTSC coordinators of red phosphor. Finally, the color purity is also calculated to analyze the quality of red light for the prepared red phosphor which is used in different W-LEDs applications.