【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。更多还原

【Abstract】 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.更多还原