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Pre-evaluation method for the spectroscopic properties of YAG bulk materials by sol-gel synthetic powder

The sol-gel synthetic powder evaluation method is the most effective and the easiest technique for pre-evaluating the spectroscopic properties of luminescent impurity doped YAG. The luminescent elements doped sol-gel powder agrees well with that of a single crystal or ceramic YAG regarding the luminescent spectra, the intensity, and the lifetime, even though the powder sintered at a low temperature of 1100°C in comparison with the YAG crystal melting point of 1970°C, because a good crystallinity of the sol-gel powder is led by the hard agglomerates of very small primary particles. It is considered that the significance of this method is to apply for not only of YAG but also of other oxides, for instance Y2O3, ZrO2, TiO2, and MgAl2O4