Abstract
Blue and green light emissive nanocrystalline Ca2Gd 8Si6O26 (CGS):Tm3+ and CGS:Er 3+ phosphors with high color purity were prepared by solvothermal reaction method. The structural and morphological properties of these phosphors were evaluated by the powder X-ray diffraction (XRD) and scanning electron microscopy, respectively. From the XRD results, Tm3+:CGS and Er 3+:CGS phosphors had the characteristic peaks of oxyapatite in the hexagonal lattice structure. The visible luminescence properties of phosphors were obtained by ultraviolet (UV) or near-UV light and low voltage electron beam (0.5-5 kV) excitation. The photoluminescence and cathodoluminescence properties were investigated by changing the variation of Tm3+ or Er 3+ concentrations and the acceleration voltage, respectively. The CGS:Tm3+ phosphors exhibited the blue emission due to 1D2→3F4 transition, while the CGS:Er3+ phosphors showed the green emission due to 4S3/2→4I15/2 transition. The color purity and chromaticity coordinates of the fabricated phosphors are comparable to or better than those of standard phosphors for lighting or imaging devices.
Original language | English |
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Pages (from-to) | 7537-7542 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 509 |
Issue number | 27 |
DOIs | |
State | Published - 7 Jul 2011 |
Keywords
- Cathodoluminescence
- High color purity blue and green emissions
- Nanocrystalline CaGdSiO
- Photoluminescence
- Solvothermal synthesis