摘要
采用熔融淬火技术制备了掺杂Sm3+的组分为30CaO-60B2O3-10AgNO3-xSm2O3(x=0.05,0.25,0.5,1,3,5(摩尔分数))硼酸钙玻璃。采用吸收光谱及荧光激发和发射光谱对样品的光谱性质进行了研究。样品吸收光谱测量表明样品中存在Ag聚集体和金属Ag纳米颗粒,Sm3+掺杂浓度的改变对金属Ag纳米颗粒的浓度产生影响,而对Ag聚集体的吸收影响较弱。样品的荧光光谱测量发现该系列样品均表现为宽带吸收和宽带发射特性,同时观察到了在405 nm激发下Sm3+的掺杂对Ag聚集体的发光产生了猝灭作用,但可改善样品发射光谱的成分,提高红色发射比例。色度学研究表明样品的色坐标随Sm3+掺杂浓度及激发波长变化。这些研究结果表明该系列样品是一种潜在的白光LED用荧光体材料。
Sm^3＋doped calcium borate glasses containing Ag with composition 30CaO-60B2O3-10AgNO3-xSm2O3（ x =0.05,0.25,0.5,1,3,5（ mole fraction）） were prepared by melt-quenching technique. Their spectroscopic properties were studied by means of absorption,excitation and emission spectral measurements. An analysis on absorption spectra indicated that Ag aggregates and Ag nanoparticles were existent in these samples. Sm^3＋doping concentration greatly influenced the content of Ag nanoparticles in the glasses,but rarely affected the absorption of Ag aggregates. Study on the fluorescence spectra displayed that all samples exhibited wide absorption and emission bands. Moreover,the Sm^3＋doping resulted in the fluorescence quenching of Ag aggregates,but increased the red component of emission spectra. It was also found that the color coordinates of these samples were varied with Sm^3＋doping concentration and the excitation wavelength. Above results indicated that these studied samples might be a potential candidate for white LED.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第4期403-409,共7页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(11104023
11104024
11374044)
973计划项目(2012CB626801)
中央高校基本科研业务费项目(3132014327)资助
