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Gd^(3+)掺杂对NaYF_4∶Yb^(3+),Tm^(3+)/Er^(3+)纳米材料上转换荧光性能的影响 被引量:8
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作者 胡荣璇 王慧云 +3 位作者 郑彤 叶松 林健 王德平 《发光学报》 EI CAS CSCD 北大核心 2015年第1期20-26,共7页
利用温和的溶剂热方法合成了具有上转换发光性能的Yb3+-Tm3+和Yb3+-Er3+共掺的纳米NaYGdF4。在该体系中,通过调节Gd3+在基质中的掺杂量可以有效地控制产物的相变、尺寸以及上转换荧光性能。XRD和TEM分析结果表明,Gd3+的掺入在促进NaYF4... 利用温和的溶剂热方法合成了具有上转换发光性能的Yb3+-Tm3+和Yb3+-Er3+共掺的纳米NaYGdF4。在该体系中,通过调节Gd3+在基质中的掺杂量可以有效地控制产物的相变、尺寸以及上转换荧光性能。XRD和TEM分析结果表明,Gd3+的掺入在促进NaYF4纳米颗粒由立方相到六方相转变的同时有助于减小其尺寸。上转换光谱研究表明,在Yb3+-Tm3+和Yb3+-Er3+共掺体系中,可通过优化Gd3+的掺杂量来有效提高产物的上转换荧光强度。同时,通过研究Tm3+和Er3+在不同可见光波段的发光强度与泵浦功率的关系探讨了上转换发光的机制。 展开更多
关键词 上转换发光 稀土掺杂 NaYGdF4
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Influence of local phonon energy on quantum efficiency of Tb^(3+)-Yb^(3+) co-doped glass ceramics containing fluoride nanocrystals 被引量:7
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作者 王慧云 叶松 +3 位作者 刘天华 李松 胡荣璇 王德平 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第5期524-528,共5页
The Tb3+single-doped and Tb3+-Yb3+co-doped glass ceramics with the precipitation of CaF2, CaF2-SrF2 solid state solu-tion and SrF2 nanocrystals were designed and prepared by taking different amounts of CaF2 and SrF... The Tb3+single-doped and Tb3+-Yb3+co-doped glass ceramics with the precipitation of CaF2, CaF2-SrF2 solid state solu-tion and SrF2 nanocrystals were designed and prepared by taking different amounts of CaF2 and SrF2 as the starting fluorides to inves-tigate the influence of the crystalline phase on the total quantum efficiency. The formation of the fluoride nanocrystals and the incor-poration of the doped rare earth ions into the fluoride nanocrystals were proved by the XRD measurement. The energy transfer from Tb3+to Yb3+was studied by the steady and time resolved spectra. The total internal quantum efficiencies were calculated based on the measured Tb3+lifetime, which was about 10.5%improved in the SrF2 nanocrystals precipitated glass ceramics compared with that in the CaF2 nanocrystals precipitated glass ceramics mainly due to the lower phonon energy environment. Meanwhile, the total external quantum efficiencies were evaluated with the integrating sphere measurement system, which were 18.6%, 19.3%and 24.4%, respec-tively, for the CaF2, CaF2-SrF2 and SrF2 nanocrystals precipitated glass ceramics. Additionally, obvious difference between the calcu-lated total internal quantum efficiency and the measured total external quantum efficiency was also discussed. 展开更多
关键词 glass ceramics crystalline phase rare earths down conversion luminescence quantum efficiency
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