Co_xR_(1-x)Al_2O_4(R=Zn,Mg)钴蓝颜料反射性能的研究

Reflectivity Properties of Co_xR_(1-x)Al_2O_4(R=Zn, Mg) Cobalt Blue Pigment

采用化学共沉淀法成功地制备出适用于彩电显象管内荧光体着色的Ｃｏ_ｘＲ_（１－ｘ）Ａｌ_２Ｏ_４（Ｒ＝Ｚｎ、 Ｍｇ， ｘ＝０．８～１．０）钴蓝颜料： ４５０ｎｍ波长处反射率最大提高１８．２％， ６００ｎｍ处反射率最大降低５％。通过对该颜料反射率的影响因素，如掺杂离子类型、掺杂浓度和Ｃｏ^（２＋）离子浓度的探讨，结论如下：Ｚｎ^（２＋）、Ｍｇ^（２＋）改变钴蓝颜料反射性能的作用机理为晶格畸变引起Ｃｏ^（２＋）３ｄ轨道电子能级分裂程度的变化；对于掺杂离子Ｚｎ^（２＋）、Ｍｇ^（２＋），ｘ下限值分别约为０．８５和０．８．

A kind of Co_xR_(1-x).Al_2O_4(R=Zn. Mg, x=0.8～1.0)cobalt blue pigment suitable for luminophor of color televisions was synthesized successfully by using the chemical coprecipitation method. Compared with CoAl_2O_4 reflectivity, the increase of reflectivity of Co_xR_(1-x)Al_2O_4 is 18.2% at 450nm and-5% at 600nm respectively. Through discussing some affecting factors on this kind of pigment such as doping canon type, doping content and Co^(2+) content, a conclusion can be drawn that the mechanism of reflectivity properties alteration of complex cobalt blue pigments caused by doping cations Zn^(2+), Mg^(2+) is Co^(2+)3d electronic energy level cleavage due to lattice distortion. The lower limit value of x of Zn^(2+), Mg^(2+) is 0.85 and 0.8 respectively.