不同激发波长下NaLaF_(4):Er^(3+)/Yb^(3+)的上转换光谱调控研究  

Upconversion spectral modulation of NaLaF_(4):Er^(3+)/Yb^(3+)at different excitation wavelengths

作　　者：孙浩[1] 李霜[1] SUN Hao;LI Shuang(School of Physics,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学物理学院,吉林长春130022

出　　处：《邵阳学院学报（自然科学版）》2024年第2期64-72,共9页Journal of Shaoyang University：Natural Science Edition

摘　　要：为探究不同激发波长(980 nm、1 550 nm)对NaLaF_(4):Er^(3+)/Yb^(3+)上转换发光材料光谱调控的规律和机理,采用水热-固相两步反应法合成一系列不同Er^(3+)/Yb^(3+)掺杂浓度的NaLaF_(4)荧光粉。利用X射线衍射仪(XRD)、荧光分光光度计对材料进行测试,分析其发光性能与机理。结果表明,样品在980 nm激发下呈绿色发光,上转换发光强度随Er^(3+)/Yb^(3+)掺杂浓度增加而呈现先增后减的规律,该发光过程为双光子过程;而在1 550 nm激发下呈红色发光,上转换发光强度随Er^(3+)掺杂浓度增加而呈增强趋势,但随Yb^(3+)浓度增加而降低,发光过程为三光子过程。因此,通过调节激发光波长,在同组分NaLaF_(4):Er^(3+)/Yb^(3+)荧光粉中实现颜色可控的绿、红色发光,对设计新型光谱调控手段和探索新的发光材料具有一定的理论指导意义。In order to investigate the laws and mechanisms of different excitation wavelengths(980 nm,1550 nm)on the spectral modulation of NaLaF_(4):Er^(3+)/Yb^(3+)upconversion luminescent materials,we synthesized a series of NaLaF_(4) phosphors with different Er^(3+)/Yb^(3+)doping concentrations by a hydrothermal-solid phase two-step reaction method.The materials were tested by XRD and fluorescence spectrophotometer to analyze their luminescence performance and mechanism.The results indicate that the samples show green luminescence under the excitation of 980 nm,and the upconversion luminescence intensity increases and then decreases with the increase of Er^(3+)/Yb^(3+)doping concentration,and the luminescence process is a two-photon process.Under excitation at 1550 nm,the samples exhibite red luminescence.The intensity of upconversion luminescence increases with increasing Er^(3+)doping concentration,but decreases with increasing Yb^(3+)concentration.The luminescence process is a three-photon process.Therefore,by adjusting the excitation wavelength,the color-controllable green and red luminescence is achieved in the same-component NaLaF_(4):Er^(3+)/Yb^(3+)phosphor,which is of theoretical significance for the design of new spectral modulation and the exploration of new luminescent materials.

关 键 词：UC发光 NaLaF_(4):Er^(3+)/Yb^(3+) 980 nm 1550 nm 光谱调控 

分 类 号：O482.31[理学—固体物理]