Abstract
Mg2+-Ge4+ ions substituted YAG: Ce3+ phosphors (Y3Al5-2xMgxGexO12: Ce3+) were prepared by high temperature solid state reaction method. X-ray diffraction (XRD), Scanning election microscope (SEM), Photoluminescence (PL) spectra and so on were used to characterize the samples. The effects of Mg2+-Ge4+ concentrations on the morphology, structure, luminescence properties, fluorescence lifetime and white LED performance of YAG: Ce3+ phosphors were studied in detail. The results indicate that Mg2+-Ge4+ ion pairs can partially substitute the Al3+ ions of YAG successfully. With the substitution, the garnet crystal structure remains unchanged. However the emission spectra show a progressive red-shift, from 528 to 552nm (about 24nm). The lifetime decreased rapidly from 84 to 26ns. In particular, the correlated color temperature (CCT) decreases gradually from 6798 to 3261K and the color rendering index (CRI) increases from 76.5 to 89.3 with the increasing of the incorporation content of Mg2+-Ge4+ ion pairs.
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