论文部分内容阅读
Tetragonal phase Na Y(WO4)2:Eu3+ phosphors were synthesized through a molten salt method. The X-ray powder diffraction(XRD) and field emission scanning electron microscopy(FE-SEM) were utilized to characterize the crystal structure and morphology. The emission and excited spectra were used to study the photoluminescence properties. The results of XRD and FE-SEM indicated that the samples prepared by this method were pure phase and the particle size was about 50 nm. The PL results showed that Eu3+5D0→7F2 red luminescence at 616.5 nm could be excited by 394.5 nm near-UV light and 465 nm blue light in Na Y(WO4)2 host effectively, and the quenching concentration was 30 mol.%. The critical energy transfer distance and J-O parameters were calculated. The energy transfer type between Eu3+ was proved. What’s more, the quantum efficiencies of the 5D0 level of Eu3+ were calculated as well.
Tetragonal phase Na Y (WO4) 2: Eu3 + phosphors were synthesized through a molten salt method. The X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) were utilized to characterize the crystal structure and morphology. The emission and excited spectra were used to study the photoluminescence properties. The results of XRD and FE-SEM indicated that the samples prepared by this method were pure phase and the particle size was about 50 nm. The PL results showed that Eu3 + 5D0 → 7F2 Red luminescence at 616.5 nm could be excited by 394.5 nm near-UV light and 465 nm blue light in Na Y (WO4) 2 host effectively, and the quenching concentration was 30 mol.%. The critical energy transfer distance and JO parameters were calculated . The energy transfer type between Eu3 + was proved. What’s more, the quantum efficiencies of the 5D0 level of Eu3 + were calculated as well.