Preparation and luminescence
properties of Gd3Ga5O12 nanocrystalline
garnet
Chem.
Met. Alloys 4 (2011) 77-80
https://doi.org/10.30970/cma4.0162
L. KOSTYK, A. LUCHECHKO, S. VARVARENKO,
O. TSVETKOVA
Nanocrystalline Gd3Ga5O12
and Gd3Ga5O12:Tb3+
phosphors were obtained by sintering precursors, which had been prepared by the
co-precipitation method. X‑ray diffraction (XRD),
atomic force microscopy (AFM), and X‑ray
luminescence spectra were used to characterize the synthesized nanocrystalline garnet. The XRD
results revealed that the samples begin to crystallize at 750 °C and a
fully crystallized pure Gd3Ga5O12 phase could
be obtained at 850 °C. The AFM images indicate
that the phosphor powders contain aggregates of grain-like particles. Under
X-ray excitation the Gd3Ga5O12:Tb3+
phosphor showed the characteristic green emissions of Tb3+ (5D4®7F6,5,4,3 transitions). A comparison between X-ray
luminescence spectra of pure and Tb3+-doped Gd3Ga5O12
samples prepared by solid-state reaction and by the co-precipitation method was
made.
2D AFM image of Gd3Ga5O12 nanopowder
calcined at 850°C.
Keywords
Nanocrystalline garnet Gd3Ga5O12
/ Co-precipitation / Rare-earth ion / X-ray luminescence