Hydrothermal synthesis, structures and luminescent properties of nanocrystaline Ca8Gd2(PO4)_6O2:Eu~(2+), Eu~(3+) phosphors

摘要

Oxyapatite CasGd2(PO4)_6O2 (CGP):Eu~(2+), Eu~(3+) ultrafine nanorods were synthesized by a facile hydrothermal method. The effect of experimental conditions such as reaction time and concentration of ethylene-diaminetetraacetic acid (EDTA) on the morphology of the nanomaterials was investigated. The structural properties were analyzed using the X-ray diffraction patterns, which confirm the hexagonal phase with space group P63/m. The pure hexagonal phase of CGP appeared without calcining in both non-EDTA and EDTA cases. The photoluminescence emission spectra of Eu ions activated CGP nanorods showed a broad bluish-green emitting band centered at 488 nm when doped in the Ca~(2+) sites while they showed a dominant red emission at 618 nm when doped in the Gd~(3+) site. These phosphors can be excited by near ultraviolet and visible light sources, which might be a promising material for the development of bioma-terials due to its hydrophilic nature and white light-emitting diodes because of their rich emission properties.