Preparation and luminescence properties of Gd3Ga5O12 nanocrystalline garnet

 

Chem. Met. Alloys 4 (2011) 77-80

 

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+ (5D47F6,5,4,3 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 850C.

 

Keywords

Nanocrystalline garnet Gd3Ga5O12 / Co-precipitation / Rare-earth ion / X-ray luminescence