Coated Luminous Powder In Light Glaze

In recent years, with the development of the society, more and more researchers put their energy on the long afterglow luminescence materials. The phosphorescent ceramic glaze, which has an encouraging prospect, is an economical-energy and environmental material. It can be used to decorate all kinds of buildings for it is the most economic lamp-house.ZrSiO₄, which is coat, was prepared from Tetraethyl Silicate (TEOS) and Zirconium Oxychloride (ZrOCl₂ · 8H₂O) by Sol-Gel. By doing so, the powder c ould b e protected from t he b asic-glaze in high t emperature. As a result, the ceramic glaze, which is made up from the coated-powder, would be sintered in 1130℃ while was 1080℃ in the past.By contrasting the conclusion of the hydrolyze, we found the blue super long afterglow luminescent powder (Sr₄Al₁₄O₂₅: Eu²⁺Dy³⁺ )was more suitable than yellow powder (SrAl₂O₄ : Eu²⁺ Dy³⁺) in this Sol-Gel procession, here Eu and Dy are active elements. The preparation processes of the coated-powder, such as the forming condition of the Sol, sinter system of the coated-powder were introduced in detail. And the result showed that Si/Zr= 1.2,pH = 3 were fit for the forming of the Sol. The coated-powder was sintered at the speed 20℃/min, and kept the highest temperature 1100℃ for 10min.The preparation processes of the phosphorescent pottery glaze were introduced too, including the composition of the basic-glaze, sinter system. The result showed that when the basic glaze was the admixture of 2# formula and big-grain glaze, and the prepared phosphorescent ceramic glaze samples were sintered in 1130℃ for 10min at the speed 20℃/min, the samples had the best luminescent performance. After put a dark environment for 6h,the phosphorescent ceramic glaze sample can be seen distinctively yet.By contrasting the emission spectrum of the powder and the coated-powder (the wavelength was 493nm and 495nm), we can found that the character of luminescence was not changed.XRD, SEM, TEM etc. were applied to analyze the microstructure and crystalline phase of the phosphorescent pottery glaze and the coated-powder.By SEM and XRD, we could conclude that the coated-powder and ZrSiC>4 in glaze was in crystal, in other words, their construct was not changed through the sinter. By TEM, it was shown that the powder was coated completely with ZrSiCj. So the luminous mechanism of the phosphorescent ceramic glaze is coincidental with the S^Al^C^s: Eu Dy3t powder.