Li^+掺杂对CaSiO_3:Pb^(2+),Mn^(2+)晶体结构及荧光性能的影响  

Effect of Li^+ Doped on Crystal structure and Luminesent Properties of CaSiO_3:Pb^(2+),Mn^(2+)Phosphors

作　　者：杨良准[1] 方敏[1] 杜立芬[1] 刘洁[1] 沈新峰[1] 张兰芬[1] 余锡宾[1] 

机构地区：[1]上海师范大学化学系,上海200234

出　　处：《应用化学》2007年第5期565-569,共5页Chinese Journal of Applied Chemistry

基　　金：上海科技发展基金资助项目(04JC14089和0452nm070)

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。Li2CO3 was added while a series of CaSiO3： Pb^2＋, Mn^2＋ phosphor were synthesized by Sol-Gel method, and the influence of Li^＋ doped on the crystal structure and luminescent properties of CaSiO3 ： Pb^2＋ , Mn^2＋ 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 theβ-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, Li2Ca3Si6O^＋6 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.

关 键 词：Li^+掺杂 偏硅酸盐 晶体结构 荧光性能 

分 类 号：O644[理学—物理化学]