【摘要】 在溶胶-凝胶法制备CaSiO3∶Pb2+,Mn2+荧光粉的过程中,通过加入一定质量分数的助熔剂Li2CO3,研究了Li+对荧光粉晶体结构及荧光性能的影响,并运用荧光光谱、DTA-TG、XRD、SEM等测试技术进行了表征。研究结果表明,在900℃焙烧下,当加入Li+质量分数≤0.25%时,荧光发射峰基本不位移,加入Li+质量分数为0.15%时的荧光强度最大,XRD分析结果表明为β-CaSiO3晶形;当质量分数>0.25%时,荧光发射峰发生缓慢蓝移,其中加入Li+质量分数为0.65%时荧光最强,发光强度为不加Li+时的3.5倍左右,发射主峰由650 nm蓝移至615 nm附近,并有微量Li2Ca3Si6O16新物质生成。研究结果还表明,Li+的加入降低了样品的合成温度。当不加Li+时,最佳焙烧温度为1 200℃;加入Li+质量分数为0.15%时,最佳焙烧温度为1 100℃;当Li+质量分数增加到0.65%时,最佳焙烧温度降至900℃。SEM分析表明,随着Li+的加入,样品逐渐由三维网络块状结构变为不规则形状,且荧光粉颗粒粒径逐渐减小。更多还原

【Abstract】 Li2CO3 was added while a series of CaSiO3∶Pb2+,Mn2+ phosphor were synthesized by Sol-Gel method,and the influence of Li+ doped on the crystal structure and luminescent properties of CaSiO3∶Pb2+,Mn2+ were investigated via PL,DTA-TG,XRD and SEM.The results show that when the sample was calcinated at 900 ℃ and the mass fraction of Li+ was no more than 0.25%,no shift in the emission band was found.When the mass fraction of Li+ was 0.15%,the emission intensity of the sample was most prominent,and the β-CaSiO3 crystalline phase was observed.When the mass fraction of Li+ was more than 0.25%,blue shift in the emission band was observed.When the mass fraction of Li+ was 0.65%,the emission intensity of the sample was enhanced 3.5 times compared to that of the sample without Li+ doped,and the emission band shifted from 650 nm to around 615 nm,and a new sort of material,Li2Ca3Si6O16 was observed.It was also found that the synthesis temperature was decreased as Li+ was added.The best calcination temperature for the sample without Li+ doped was 1 200 ℃;when the mass fractions of Li+ were 0.15% and 0.65%,the best calcination temperatures were 1 100 ℃ and 900 ℃ respectively.SEM also showed that with Li+ added,the shape of the products gradually turned irregular from 3-dimensional network structure,and the size of the phosphor particles became smaller.更多还原