制备了铕离子掺杂氧氮玻璃陶瓷,研究了该玻璃陶瓷的发光性能.X射线衍射结果表明玻璃基质中析出了CaAl2Si2O8,Ca2Al2SiO7和Y20Si12O48N4等晶体.随着SiaN4成分的增加或热处理的进行,玻璃陶瓷中一些Eu3+离子被还原成Eu2+离子.我们认为Eu3+被还原为Eu2+主要源自于6Eu3++2N3-→6Eu2+ +N2↑氧化还原反应,或者源自于析出的CaAl2Si2O8和Ca2Al2SiO7晶相中Eu3+对Ca2+的取代.玻璃陶瓷除了产生类似于玻璃中三价Eu3+离子f-f跃迁的橘红色发光外,还出现了源自于d-f跃迁的Eu2+离子超宽带蓝绿色发光.因此,玻璃陶瓷中Eu3+离子的橘红色发光和Eu2+离子的蓝绿色发光混合产生了白色发光,具有更高的发光强度和白光显色指数,在LED照明领域展示出很好的潜在应用前景.
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