发光学报, 2015, 36 (6): 623, 网络出版: 2015-06-25
NaYF4:Yb3+,Er3+上转换荧光纳米体系的红光来源
Origin of Red Emission in NaYF4:Yb3+,Er3+ Lanthanides Doped Upconversion Nanosystem
上转换发光 功率依赖 交叉弛豫 能级布居 upconversion excitation power dependence cross-relaxation energy state population
摘要
对NaYF4:Yb3+,Er3+纳米材料的发光强度与激发光功率的依赖关系进行了研究,分析了NaYF4:Yb3+,Er3+裸核纳米体系及其核包壳纳米体系的上转换红光真实来源.结果表明：核包壳的纳米体系完全不同于裸核纳米体系,交叉弛豫对于NaYF4:Yb3+,Er3+纳米体系的上转换红光发射起主导作用,而多声子弛豫过程几乎可以忽略.这个结果对于提高上转换发光纳米材料的上转换效率、调控各发光带之间的相对强度和实现上转换发光的单色性具有重要的指导意义.
Abstract
In order to research the origin of red emission in NaYF4:Yb3+,Er3+ upconversion nanoparticles,the dependence of upconversion fluorescence intensity on the excitation power was studied in this paper.The bare core and core/shell NaYF4:Yb3+,Er3+ nanoparticles were synthesized,and their emission spectra were analyzed in detail.It is found that the cross-relaxation has great influence on the red emission in NaYF4:Yb3+,Er3+ upconversion nanoparticles.Different from bare core NaYF4:Yb3+,Er3+ nanoparticles,the cross-relaxation plays a leading role for the red emission in core/shell NaYF4:Yb3+,Er3+ nanoparticles,and the multi-photon relaxation can be almost ignored.
吴飞, 海鹰, 孔祥贵, 佐婧, 王丹, 李翠霞, 涂浪平, 李齐清, 赵慧颖. NaYF4:Yb3+,Er3+上转换荧光纳米体系的红光来源[J]. 发光学报, 2015, 36(6): 623. WU Fei, HAI Ying, KONG Xiang-gui, ZUO Jing, WANG Dan, LI Cui-xia, TU Lang-ping, LI Qi-qing, ZHAO Hui-ying. Origin of Red Emission in NaYF4:Yb3+,Er3+ Lanthanides Doped Upconversion Nanosystem[J]. Chinese Journal of Luminescence, 2015, 36(6): 623.
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