Abstract
A series of novel garnet Y2-xLaCaGa3ZrO12:xLn3+ (0 ≤ x ≤ 0.12; Ln = Eu and Tb) phosphors was prepared by a solid-state reaction. Their structural and photoluminescence properties were characterized by X-ray diffraction, Rietveld refinement, and photoluminescence spectroscopy. The studied Y2-xLaCaGa3ZrO12:xLn3+ phosphors crystallized in a cubic garnet crystal structure and Ia3¯d space group. The Eu3+- and Tb3+-doped Y2-xLaCaGa3ZrO12 phosphors exhibited strong red and green light emissions, respectively, and high emission color purity. With increasing Tb3+ content, the emitting color of the Y2-xLaCaGa3ZrO12:xTb3+ phosphors shifted to the green spectral region because of cross-relaxation among Tb3+ ions. The Y2-xLaCaGa3ZrO12:xLn phosphors are suitable for applications in white light-emitting diode and other optoelectronic devices.
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