Preparation of Cerium-Activated GAG Phosphor Powders Influence of Co-doping on Crystallinity and Luminescent Properties

An impure-phase GdA1O 3 usually remains in the product of gadolinium aluminum garnet (GAG) powder as synthesized. In this study, an attempt to prepare a stable GAG pure-phase powder by substituting small cations (Tb 3+ , Y 3+ , or Lu 3+ ) at the dodecahedral sites or the substituting the large cation (Ga 3+ ) for the Al 3+ sites of the garnet structure was made. Pure garnet-phase GAG powder was formed by calcining at 1500°C for 2 h. It was found that increasing the Lu 3+ content in the Gd 3+ lattice site of the dodecahedral or increasing the Ga 3+ content in the Al 3+ site induces a blue shift in the emission wavelength. The color temperature of the pure GAG:Ce (YAG:Ce) phosphor powder (∼2900 K) formed was lower than that of yttrium aluminum garnet and terbium aluminum garnet (TAG:Ce) phosphors.

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