【摘 要】
：
β-NaYF4是目前公认的最有效的上转换基质,但是其量子效率依然很低,对β-NaYF4进行包覆,是一种有效提高其量子效率的方法。[1,2]目前,关于3-NaYF4∶Er3+/Yb3+核壳结构的报道有很多,但是对于上转换过程中涉及到的相关能级的布居变化以及布居变化对上转换增强的影响却未见报道。本文中合成了三明治结构β-NaYF4∶2％Er3+/20％Yb3+@β-NaYF4纳米颗粒。三明治结构与核壳
【机 构】
：
中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,吉林 长春 130033;中国科学院大学,北京 100039
【出 处】
：
第八届中国功能玻璃学术研讨会暨新型光电子材料国际论坛
论文部分内容阅读
β-NaYF4是目前公认的最有效的上转换基质,但是其量子效率依然很低,对β-NaYF4进行包覆,是一种有效提高其量子效率的方法。[1,2]目前,关于3-NaYF4∶Er3+/Yb3+核壳结构的报道有很多,但是对于上转换过程中涉及到的相关能级的布居变化以及布居变化对上转换增强的影响却未见报道。本文中合成了三明治结构β-NaYF4∶2％Er3+/20％Yb3+@β-NaYF4纳米颗粒。三明治结构与核壳结构相似,也可以大幅度提高纳米颗粒的上转换发光强度。通过分析荧光光谱和寿命曲线,研究了三明治结构中上转换增强的机理。我们发现在三明治结构中,上转换发光增强主要是由于三明治结构极大的减少了激发态Yb3+的无辐射弛豫而造成的。同时,我们研究了三明治结构中4F9/2(Er3+)的布居。结果表明,当纳米颗粒的尺寸较小时,其布居主要来自于中间能级4I13/2(Er3+)的能量传递；随着颗粒尺寸的增加,4S3/2(Er3+)的贡献越来越大。另外,4S3/2(Er3+)对4F9/2(Er3+)的布居贡献主要源于Er3+和Yb3+的交叉弛豫能量传递(453/2→4I13/2与2F7/2→2F5/2)并伴有能量回传(2F5/2→2F7/2与4I13/2→4F9/2)。这种布居方式与纳米材料和体材料中布居的方式是一致的。
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