温度和浓度对分散在SiO_2中Y_2O_3∶Eu^(3+)纳米材料发光的影响  

Influences of Temperature and Concentration on Photoluminescence of Y_2O_3∶Eu Nanocrystals Scattered in SiO_2

作　　者：吕少哲[1] 张继森[1] 张家骅[1] 刘春旭[1] 

机构地区：[1]中国科学院激发态物理重点实验室,吉林长春130033

出　　处：《发光学报》2005年第3期365-368,共4页Chinese Journal of Luminescence

基　　金：国家自然科学基金资助项目(10274083)

摘　　要：讨论了分散在SiO2中的Y2O3∶Eu纳米发光材料在不同浓度和不同灼烧温度下光谱的变化规律,在室温紫外激光波长激发下不同灼烧温度下样品的发射光谱。从光谱上看到在一定浓度下随着灼烧温度的升高发光变强,而且在一定温度下随浓度提高发光变强。尤其在5D0→7F0跃迁谱线的强度明显高于5D0→7F2的电偶极跃迁强度,并分析了原因。探讨了合理的掺杂浓度和灼烧温度,并测量了Y2O3∶Eu质量分数为5%时,灼烧温度在1300℃时的激发光谱和格位选择激发光谱。样品平均粒径50nm,得到在不同波长激发下的5D0→7F1和5D0→7F2选择激发光谱。分析认为Eu3+存在着4种格位,并对其进行了初步的分析讨论。The Y_2O_3∶Eu^(3+) nanocrystals scatered in SiO_2 hosts were synthesized by sol-gel method. According to XRD patterns, the samples calcined at 800 ℃ were noncrystals and the size was smaller. The calcining temperature was elevated to 1 000 ℃, the crystalline phase began to occur and the nanocrystals were well crystallized at 1 200 ℃and the particle size did not become large. The spectrum principles of Y_2O_3∶Eu^(3+) nanocrystals scattered in SiO_2 for different annealed temperature and concentration have been intensively (discussed.) At (ultraviolet) laser excitation at room temperature, the emission intensity of samples increased with elevated annealing temperature for the same concentration. For the same annealing temperature, the intensity became strong as the increase of concentration. The intensity of ~5D_0→~7F_0 was stronger than of ~5D_0→~7F_2 and the origin was analysed. Appropriate doped concentration and calcining temperature were studied. The excitation spectra and site-selective excitation spectra for 5% Y_2O_3∶Eu content (mass fraction) calcined at 1 300 ℃ were measured. The (average) size was 50 nm. According to selective excitation spectra of ~5D_0→~7F_1 and (~5D_0→~7F_2), Eu^(3+) occupied four sites.

关 键 词：溶胶-凝胶 发光强度 Eu^3+发光 

分 类 号：O482.31[理学—固体物理]