声子态密度对掺稀土玻璃材料上转换发光强度的影响  

Influence of Phonon Density on the Intensity of Upconversion Luminescence of Rare Earths Doped Glass

作　　者：苏方宁[1] 邓再德[1] 

机构地区：[1]华南理工大学特种功能材料及其制备新技术教育部重点实验室,广东广州510640

出　　处：《玻璃与搪瓷》2007年第2期1-5,共5页Glass & Enamel

基　　金：国家自然科学基金资助项目(60307004和50472053);广州市科技计划重大项目(2004Z2-D0131和2004A10602002);广东省自然科学基金资助项目(04200036)

摘　　要：用熔融法制备了碲酸盐玻璃(PWT)和锗酸盐玻璃(PWG),测试了它们的上转换发光。试验发现声子能量高的锗酸盐玻璃上转换发光强度远强于声子能量低的碲酸盐玻璃上转换荧光的“异常”现象。从物理模型及其物理意义上,并从Raman光谱定性分析得知,当基质材料的声子能量相差不大时,声子态密度对上转换发光强度起决定性作用,从而能对试验现象进行较为圆满的解释。The influence of phonon density and phonon energy on the intensity of upconversion luminescence was analyzed by physical model and concept. The results show that phonon density plays an important role in the upconversion luminescence when phonon energy of the matrixes is basically approximate. The term of phonon density is defined qualitatively from the Raman spectra, in which the integral area of the peak and the integral peak height of the whole spectra are used for qualitative determination of the phonon density. The higher integral area and peak height means the higher phonon density of the host material. By this way, it could be used to explain why the germanate glasses have stronger intensity of upconversion luminescence than that of the tellurite glasses.

关 键 词：声子态密度 声子能量 上转换发光 RAMAN光谱 

分 类 号：TQ171.734[化学工程—玻璃工业]