Abstract
A novel co-precipitation method for synthesizing (Gd 1− x , Pr x ) 2O 2S nano-phosphors was developed, using the commercially available Gd 2O 3, Pr 6O 11, H 2SO 4 and NaOH as the starting materials. This method has the advantage of controllable phosphor particle size and shape, simplicity in processing, low cost, and not involving toxic carbon disulfide or hydrogen sulfide. It was found that the as-synthesized precursor is mainly composed of (Gd 1− x , Pr x ) 2(OH) 4SO 4· nH 2O. By calcining the (Gd 1− x , Pr x ) 2(OH) 4SO 4· nH 2O precursor at a temperature higher than 700 °C for 1 h in flowing hydrogen, pure quasi-spherical shaped (Gd 1− x , Pr x ) 2O 2S particles can be synthesized. The (Gd 1− x , Pr x ) 2O 2S particles have a narrow size distribution with a mean grain size of about 20–30 nm. UV–vis spectra indicates that the absorption edge of the samples has a blue shift with increasing calcination temperature, while PL spectra of (Gd 1− x , Pr x ) 2O 2S under 301 nm excitation show a green emission at 511 nm as the most prominent peak, which corresponds to the 3P 0 → 3H 4 transition of Pr 3+ ions. The optimal x value is 0.01 for the highest luminescent emission intensity.
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