【摘要】 采用熔融冷却法制备了Er3+/Yb3+共掺TeO2-WO3-La2O3-AgNO3玻璃,通过热处理获得了透明含银纳米晶的碲酸盐系统玻璃。测试了不同热处理条件后所得玻璃样品的透过率及受激发射光谱,并使用高分辨透射电镜表征玻璃中的银纳米晶,分析了荧光增强机理。经过390℃热处理15 min后,玻璃中析出了银纳米晶。玻璃在银纳米晶引入前后的上转换绿、红光均为双光子吸收。银纳米晶产生的局域电场增强使得含银纳米晶玻璃的上转换发光和近红外发光都有增强,其中上转换绿光强度是不掺Ag NO3玻璃的5倍。更多还原

【Abstract】 TeO2-WO3-La2O3-AgNO3 glass samples were prepared via melt-quenching method,and the transparent tellurite glasses with Ag nanocrystallites were obtained by heat treatment. The transmittance spectra and stimulated emission spectra of the glass samples with different heat-treatment systems were measured. Ag nanocrystallites in glasses were examined by HR-TEM images,and the luminescence enhancement mechanism was also analyzed. The results show that Ag nanocrystallites are crystallized by heat treatment under 390 ℃ for 15 min. The two-photon absorption process of green and red light in glass does not change after Ag nanocrystallites are introduced. Because of the enhanced local electric field generated by Ag nanocrystallites,the up-conversion and near-infrared luminescence of Ag-contained glass increase,of which the green light intensity of the glass containing Ag nanocrystallites is 5 times as much as that of glass without Ag nanocrystallites.更多还原