光谱学与光谱分析, 2010, 30 (3): 616, 网络出版: 2010-07-23  

980 nm激发下Tm3+诱导的Gd3+上转换发光性质研究

Study on Ultraviolet Upconversion Emissions of Gd3+ Induced by Tm3+
作者单位
1 井冈山大学数理学院, 江西 吉安 343009
2 吉林大学电子科学与工程学院, 集成光电子国家重点联合实验室, 吉林 长春
3 中国科学院长春光学精密机械与物理研究所, 中国科学院激发态物理重点实验
摘要
通过简单温和水热法, 制备了系列Tm3+/Yb3+共掺GdF3粉末。 用X射线衍射仪和场发射扫描电镜对样品进行了结构和形貌表征。 在980 nm半导体连续激光二极管激发下, 用荧光光谱仪对氩气保护下退火后的粉末样品进行了上转换发射光谱表征。 粉末上转换发光动力学过程是在脉冲(脉宽10 ns, 重复频率10 Hz)YAG∶Nd激光器激发光参量振荡器至980 nm 激发下研究的, 发光信号由单色仪和示波器记录。 文章主要讨论了Gd3+的311.6 nm(6P7/2→8S7/2)的发光动力学行为。 发光动力学分析结果表明: 在980 nm激发下, Gd3+, 作为一种基质离子, 其发光是由Yb3+作为一级敏化离子通过多步能量传递把能量传递给Tm3+使其布居至3P2能级; 然后Tm3+作为二级敏化离子通过能量传递过程3P2→3H6(Tm3+): 8S7/2→6IJ(Gd3+)把能量传给Gd3+; 进一步, Gd3+与Yb3+或Tm3+之间通过能量传递过程布居至高激发多重态6DJ能级; 最后, 可观察到Gd3+的激发态6D9/2, 6IJ, 6P5/2及6P7/2至基态8S7/2的发射。 同时, Tm3+在其自身发光过程中也充当激活剂, 除了3P2及1I6至3H6的发射外, 其他发射不作研究。 文章还研究了基质Gd3+依赖于Yb3+浓度、 Tm3+浓度、 退火温度及激发功率密度的紫外上转换发光性质。under 980 nm Excitation
Abstract
Series of Tm3+/Yb3+ co-doped GdF3 powders were synthesized through aneasy and mild hydrothermal method. The phase and purity of powders werecharacterized by powder X-ray diffraction (XRD) (Rigaku RU-200b). Themorphologies of the samples were characterized by field emission scanningelectron microscopy (FE-SEM) (Hitachi S-4800). The ultraviolet (UV) up-conversion(UC)emission spectra were recorded by a fluorescence spectrophotometer (HitachiF-4500) with a 980 nm semiconductor continuous wave laser diode as the excitationsource. And the luminescent dynamics was measured by excitation with 980 nm usingan optical parameter oscillator (OPO) laser pumped by a pulsed Nd∶YAG laser witha pulse duration of 10 ns, repetition frequency of 10 Hz, and the signal wasrecorded by using a monochromator and an oscillograph. Under 980 nm excitation,Gd3+, acting as a kind of host ion in the studied system, and its UV UC emissionswere observed and studied. The luminescent dynamics of the characteristicemission of Gd3+ (311.6 nm, 6P7/2→8S7/2) was explored and studied. Theluminescent dynamics analysis results indicated that, on UV UC emissions of Gd3+,Yb3+ ions served as primary sensitizer ions successively transferring energy toTm3+ to populate the 3P2 level. Then, Tm3+ ions served as secondary sensitizerions transferring energy to populate the multiple 6IJ states of Gd3+ 3P2→3H6(Tm3+): 8S7/2→6IJ (Gd3+). Further, 6DJ levels were populated through otherenergy transfer processes between Gd3+ and Yb3+ or Tm3+. Finally, UV UC emissionsfrom the excited 6D9/2, 6IJ, 6P5/2, and 6P7/2 states to the ground state 8S7/2were observed. Meanwhile, Tm3+ acted as activator in its own UC emissions, andthe article did not put emphasis on those except the 3P2 and 1I6 levels to theground state 3H6 transitions. Especially, the dependences of UV UC emissions ofGd3+ on the Yb3+ concentrations, the Tm3+ concentrations, the annealingtemperatures, and the excitation power densities of the 980 nm semiconductorcontinuous wave laser diode were studied, too.Luminescent dynamics(2009GQW0010)和江西省教育厅科技计划项目(GJJ10203)资助

曹春燕, 余晓光, 秦伟平, 张继森. 980 nm激发下Tm3+诱导的Gd3+上转换发光性质研究[J]. 光谱学与光谱分析, 2010, 30(3): 616. CAO Chun-yan, YU Xiao-guang, QIN Wei-ping, ZHANG Ji-sen. Study on Ultraviolet Upconversion Emissions of Gd3+ Induced by Tm3+[J]. Spectroscopy and Spectral Analysis, 2010, 30(3): 616.

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