物质比及掺杂浓度对燃烧合成制备Eu掺杂Ca-α-SiAlON荧光粉的影响

Effect of the Proportion of Comburents and Eu^(2+) on Combustion Synthesis of Eu-Doped Ca-α-SiAlON Phosphors

采用高效、便捷的燃烧合成工艺,通过调整多项工艺参数,制备出了高性能Eu^(2+)掺杂的Ca-α-Sialon体系荧光粉。对原始反应物中燃烧物质的比重进行了步长为1%(质量分数)的精细调控,探索了硅粉原料比例对产物性能的影响规律,确定了最佳原料配比;通过精细调控体系中作为发光中心的Eu2+掺杂量,探究了产物发光性能随铕离子掺杂浓度的变化规律;最终确定了最为适宜的燃烧合成反应参数。通过使用XRD、SEM、等测试手段对产物进行分析,发现其α-Sialon相纯度高,残余硅少,颗粒结晶良好,粒度分布均匀,PL谱测试表明其在250~350 nm和350~450 nm区间内存在2个较宽的吸收带,在580 nm附近处有较强的黄光发射,半峰宽约为94 nm。

Eu-doped Ca-α-SiAlON phosphors with the compositions Ca_(0.72)Eu_(0.08)Si_(9.56)Al_(2.44)O_(0.84)N_(15.16) were prepared by a facile yet efficient combustion synthesis method. Effects of the mass ratio of comburents(Si & Al) and Eu^(2+) in the starting reactants were investigated by adjusting the starting compositions of reactants accurately. The as-produced Ca-α-sialon:Eu2+ phosphors are of high purity, uniform and discrete particle morphology and good luminescence properties with a yellow emission that peaks at 580 nm under a UV or blue light excitation within 250~350 nm or 350~450 nm.