双掺Eu3+和Tb3+的下转换β-NaYF4的合成与发光性能

蒋晨飞; 黄文娟; 丁明烨; 宋艳; 倪亚茹; 陆春华; 许仲梓

doi:doi:10.3788/fgxb20123307.0683

发光学报, 2012, 33 (7): 683, 网络出版: 2012-08-15

双掺Eu³⁺和Tb³⁺的下转换β-NaYF₄的合成与发光性能

Synthesis and Luminescence Properties of β-NaYF₄ Doped with Eu³⁺ and Tb³⁺

论文大纲

蒋晨飞 ^*黄文娟丁明烨宋艳倪亚茹陆春华许仲梓

作者单位

南京工业大学材料科学与工程学院, 江苏南京 210009

高温溶剂热法偶极子跃迁 down-conversion β-NaYF4 β-NaYF4 high temperature solvothermal method dipole transition

摘要

采用高温溶剂热法合成了下转换发光材料NaYF4∶Eu3+ 和NaYF4∶Eu3+,Tb3+ , 采用X射线衍射(XRD)、场发射扫描电镜(FESEM)、激发(PLE)谱和光致发光(PL)谱对材料的物相结构、形貌特征和发光性质进行了表征和研究, 并分析了其发光原理。结果表明：所合成的NaYF4∶Eu3+ 和NaYF4∶Eu3+,Tb3+ 为纯六方相晶体, 尺寸在100 nm左右; 改变Eu3+ 和Tb3+ 的掺杂浓度后晶格结构没有发生明显变化, 说明Eu3+ 和Tb3+ 取代的是Y3+的晶格位置; 在394 nm光的激发下, 检测到Eu3+ 在5D0→7F1 和5D0→7F2跃迁处的特征发射光, 并且可见光强度随着Eu3+ 离子掺杂浓度的变化而变化。另外Tb3+ 离子浓度对NaYF4∶Eu3+ 晶体结构产生了一定的影响, 说明掺杂Tb3+ 离子改变了Eu3+ 离子所处的配位环境, 导致红色发光带增强, 而这主要源于电偶极子跃迁的贡献。

Abstract

Powdered samples NaYF4∶Eu3+ and NaYF4∶Eu3+, Tb3+ are successfully prepared by high temperature solvothermal method. The obtained samples are characterized by X-ray power diffraction(XRD), field emission scanning electron microscopy (FESEM), and photoluminescence(PL) spectra. Experiment results revealed that as-prepared NaYF4∶Eu3+ and NaYF4∶Eu3+, Tb3+ crystallized in hexagonal phase without cubic phase, and the size was about 80 nm×100 nm (side length×thickness). When the doping concentration of Eu3+ and Tb3+are various, the lattice structure of samples do not change, indicating that the Eu3+ and Tb3+ ions are completely dissolved in the NaYF4 host lattice by substitution for the Y3+. The emission from 5D0→7F1 (595 nm) and 5D0→7F2 (618 nm) of Eu3+ ions was observed under excitation of 394 nm light from Xe lamp. The visible light intensity changes with the doping ions of Eu3+ concentration and the influence to crystal structure of Tb3+ ions concentration have been investigated. These results show that the doping ions of Tb3+ change the coordination environment of Eu3+, resulting to stronger red emissions, and electric dipole transition occupied the main contribution.

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蒋晨飞, 黄文娟, 丁明烨, 宋艳, 倪亚茹, 陆春华, 许仲梓. 双掺Eu³⁺和Tb³⁺的下转换β-NaYF₄的合成与发光性能[J]. 发光学报, 2012, 33(7): 683. JIANG Chen-fei, HUANG Wen-juan, DING Ming-ye, SONG Yan, NI Ya-ru, LU Chun-hua, XU Zhong-zi. Synthesis and Luminescence Properties of β-NaYF₄ Doped with Eu³⁺ and Tb³⁺[J]. Chinese Journal of Luminescence, 2012, 33(7): 683.

双掺Eu³⁺和Tb³⁺的下转换β-NaYF₄的合成与发光性能

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