Photoluminescence characteristics of Y3Al5O12:Tb3+ phosphors synthesized using the combustion method

Abstract

For this study, terbium-doped yttrium aluminum garnet (YAG:Tb) phosphor powders were prepared via the combustion process using the 1:1 ratio of metal ions to reagents. The characteristics of the synthesized nano powder were investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence. Single-phase cubic YAG:Tb crystalline powder was obtained at 800°C by directly crystallizing it from amorphous materials, as determined by XRD techniques. There were no intermediate phases such as yttrium aluminum perovskite (YAlO 3 ) and yttrium aluminum monoclinic (Y 4 Al 2 O 9 ) observed in the sintering process. The SEM image showed that the resulting YAG:Tb powders had uniform sizes and good homogeneity. With the increase in the sintering temperature, the grain size increased. The photoluminescence spectra of the YAG:Tb nanoparticles were investigated to determine the energy level of electron transition related to luminescence processes. There were three peaks in the excited spectrum, and the major one was a broad band of around 274 nm. Also, the YAG:Tb nanoparticles showed two emission peaks in the range of 450×500 and 525×560 nm, respectively, and had maximum intensity at 545 nm.

Influence of Flux on Morphological and Luminescent Properties of Y₃Al₅O₁₂:Tb³⁺ Phosphor

“…YAG: Tb 3+ phosphors with appropriate size and particle match, uniform and good surface morphology, excellent luminescent characteristics are desirable in numerous of these applications [1,2,4,5]. Several soft chemical processes have been developed for such purpose, including co-precipitation, spray pyrolysis, hydrothermal synthesis, sol-gel or citrate-nitrate gel combustion [6][7][8][9][10][11]. Those soft chemical processes have been successfully used to obtain desirable size and shape phosphors.…”