Preparation and Optical Properties of Ce3+ Doped Gdalo3 Nano-Particles by Co-Precipitation Method

Abstract

The nanoparticles of GdAlO3:Ce were synthesized with sodium dodecylbenzene sulfonate (SDBS) as dispersant and ammonia as precipitant by co-precipitation reaction to prepare precursors under different conditions. The phase composition of the precursors and the particle morphology were characterized by thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction (XRD) and scanning electron microscope (SEM). The excitation and emission spectra of the resultant samples were analyzed by the photoluminescence spectroscope (PL). The results showed that the as-prepared well-dispersed nano-sized GdAlO3:Ce powder appeared spherical morphology at the initial concentration of metallic salt in liquor of 0.3 mol/L, the synthesized temperature at 0 ℃, calcined at 1300 ℃ for 2 h. The relative intensity of photoluminescence peak has the maximum value when the Ce3+ dopant content is 0.9 mol% (mole fraction). The concentration quench occurs when the Ce3+ dopant content exceeds 0.9 mol% and the peak of the excitation spectrum appears at the wavelength of 381 nm.

Keywords: GdAlO3:Ce, nanoparticles, co-precipitation method, optical spectrum characteristics