No abstract

In this study, gehlenite: Eu glassy powders were synthesized from two common Si sources, silicon tetraethyl orthosilicate (TEOS) and silicon acetate (SiA), using spray pyrolysis. Its morphology and chemical composition were studied. The morphological results suggested that the SiA‐derived powder contained more porous particles than the TEOS‐derived powder. The two gehlenite powders thus formed were found to have similar chemical compositions. Accordingly, porous gehlenite: Eu glassy phosphor seems to exhibit superior PL properties, which have the potential to be exploited in novel phosphor materials.

Eu-doped amorphous gehlenite phosphors with various morphologies were synthesized using spray pyrolysis. Along with un-treated precursor, two commonly used pore-forming agents, polyethylene glycol and hydrogen peroxide, were applied to achieve porous and hollow particle structures. The phase compositions, surface morphologies, inner structures and photoluminescence properties of the resulting phosphors were examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and fluorescence spectrometry. The results showed that the morphologies of the particles were well-controlled, and a correlation between morphology and photoluminescence properties was established.