低温燃烧合成红外响应材料CaS:Eu,Sm及性能表征

Synthesis of IR Sensitive Material CaS:Eu,Sm by Low-Temperature Combustion and Its Characterization

以金属硝酸盐-尿素作为原料体系,引入了升华硫粉,通过低温燃烧法一步合成了硫化物体系红外响应材料。对硝酸盐-尿素体系的低温燃烧过程进行了分析,根据氧化-还原反应的化合价理论计算了尿素燃料的理论用量。燃烧点火温度为600℃,反应时间为2min～3min,产物为红色云层状疏松多孔的纳米粉末,粒径为36nm左右。对样品进行XRD物相分析证明产物为CaS晶相,面心立方结构。光谱分析表明:自然光可以有效激发样品使之储能;样品在800nm～1600nm之间具有宽光谱红外响应效应;红外转换发光峰值波长位于655nm,对应于Eu2+离子的4f65d→4f7(8S7/2)跃迁。

Infrared sensitive material CaS：Eu,Sm was synthesized by adding sublimate sulphur and using nitrate-urea as raw material system in a low-temperature combustion synthesis （LCS） method. The combustion process was discussed and the theoretical amount of urea adding was calculated according to the oxidation-reduction theory. It is found that the ignited temperature is 600℃, the reaction duration is 2 min-3 min and the product is red loose nano-powders with the size of 36 nm or so. XRD pattern shows that the product has a CaS crystal structure. Spectra analysis indicates that the sample can be excited effectively by natural light to store energy. The sample is sensitive to the infrared light of 800 nm-1600 nm and then emit a red light due to the transition 4f^65d→4f^7（^8S7/2） of Eu^2＋ ion.