Author(s)

Minsung Kim, Makoto Kobayashi, Hideki Kato, Masato Kakihana

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.

A LiCaPO₄:Eu²⁺ phosphor with high photoluminescence was synthesized using a polymerizable complex (PC) method employing a water-soluble polyethylene glycol-conjugated phosphate ester (PEG-P). PEG-P could be obtained from a reaction among polyethylene glycol 300, phosphorus pentoxide, and pyrophosphoric acid. The PEG-P prepared was stable in an aqueous condition. A transparent solution and gel were obtained when the PEG-P was used as a source of P during the PC method, whereas the use of H₃PO₄ caused an undesirable precipitate. The LiCaPO₄:Eu²⁺ obtained via the PC method employing the PEG-P showed higher emission intensity than those synthesized by a solid state reaction method and the PC method employing H₃PO₄. The high luminescence properties of the sample synthesized using the PEG-P may be attributed to high homogeneity of constituents in the sample.

Solution Method; Stable Phosphate Ester; Homogeneity; LiCaPO₄:Eu²⁺

M. Kim, M. Kobayashi, H. Kato and M. Kakihana, "A Highly Luminous LiCaPO₄:Eu²⁺ Phosphor Synthesized by a Solution Method Employing a Water-Soluble Phosphate Ester," Optics and Photonics Journal, Vol. 3 No. 6A, 2013, pp. 13-18. doi: 10.4236/opj.2013.36A003.