Enhancement of red emission intensity of Ca2Al2SiO7:Eu3+ phosphor by MoO3 doping or excess SiO2 addition for application to white LEDs

Bi-doped CaO–Al2O3–SiO2 glass microspheres with Ca2Al2SiO7 (gehlenite) composition were prepared by combination of solid-state reaction and flame synthesis. The concentration of Bi was 0.0, 0.5, 1 and 3 mol %. The chemical composition of prepared glass microspheres was determined by X-ray fluorescence (XRF). The structural and magnetic properties of prepared glass microspheres and their polycrystalline analogues were studied by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Raman spectroscopy and SQUID magnetometry. The closer inspection of glass microspheres surface by SEM confirmed smooth surface and revealed no features indicating presence of crystalline phases. All Bi-doped microspheres are X-ray amorphous, however in case of undoped microspheres XRD detected traces of crystalline gehlenite. XRD analysis of samples crystallized at 1273 K for 10 h revealed the presence of gehlenite as the main crystalline phase. The presence of gehlenite in crystallized samples were also confirmed by Raman spectroscopy. All samples (glass microspheres and their crystalline analogues) showed diamagnetic or weak ferromagnetic behavior at room temperature, whereas paramagnetic or weak ferromagnetic behavior was observed at 2 K.

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Enhancement of red emission intensity of Ca₂Al₂SiO₇:Eu³⁺ phosphor by MoO₃ doping or excess SiO₂ addition for application to white LEDs

Abstract: . We confirmed that the photoluminescence intensity of the obtained phosphors is fairly enhanced by excessive SiO 2 . The mechanism of this photoluminescence enhancement is discussed in this paper.

Cited by 2 publications

References 25 publications

Judd–Ofelt Parameters of Eu3+ and Energy Transfer of Ce3+/Eu3+ in Sr2Al2SiO7 Materials

Judd–Ofelt Parameters of Eu3+ and Energy Transfer of Ce3+/Eu3+ in Sr2Al2SiO7 Materials

Structure and magnetic properties of Bi-doped calcium aluminosilicate glass microspheres

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