基于能量传递可调色度ZnNb2O6:Dy3+,Eu3+荧光粉的制备及其发光性能研究

Synthesis and Luminescence Properties of Multicolor Tunable ZnNb2O6: Dy3+, Eu3+ Phosphors Based on Energy Transfer

采用传统的高温固相法合成了Dy^3+/Eu^3+单掺杂和Dy^3+, Eu^3+共掺的具有可调色度ZnNb2O6荧光粉。利用X射线衍射、激发和发射光谱、荧光寿命以及扫描电镜(SEM)等系统地分析了上述合成样品。ZnNb2O6在200~500 nm有着较宽的吸收带,呈现出具有自激活发光的特性。ZnNb2O6:0.08Dy^3+和Zn Nb2O6:0.08Dy^3+, 0.03Eu^3+荧光粉的色度坐标接近标准白光(0.33, 0.33)。通过Dy^3+作为敏化剂, Eu^3+作为红光发光来调节样品的发光颜色;通过荧光光谱以及荧光寿命衰减曲线确定Dy^3+至Eu^3+离子的能量传递机制。分析得出Dy^3+离子到Eu^3+离子的能量传递机制遵循非辐射电偶极矩-电四极矩作用。据此,本文制备的ZnNb2O6:0.08Dy^3+, y Eu^3+荧光粉在紫外汞灯白光源和其他固态照明技术中具有一定的应用价值。

In order to study new rare earth ion doped chromaticity phosphors, a color-tunable phosphor based on Dy^3+/Eu^3+ co-doped ZnNb2O6 were synthesized by a traditional solid-state reaction method. X-ray powder diffraction(XRD), Scanning Electron Microscope(SEM), photoluminescence spectra and decay curves were utilized to characterize the as-prepared phosphors. The ZnNb2O6 host was proved to be a self-activated phosphor with broad absorption range from 200 to 550 nm. The color coordinate(x, y) values of Zn Nb2O6: 0.08 Dy^3+ and ZnNb2O6: 0.08 Dy^3+, 0.03 Eu^3+ phosphors were already very close to the standard white light(0.33, 0.33). Therefore,Dy^3+ was selected as the sensitizer ion and red component from Eu^3+ adjusted to control the emission color. The energy transfer from Dy^3+ to Eu^3+ was confirmed based on the luminescence spectra and decay curves. Furthermore,the energy transfer mechanism was deduced to be the dipole-quadrupole interaction. In general, the ZnNb2O6:0.08 Dy^3+, y Eu^3+ phosphors obtained may have potential application in the ultraviolet pumped white light sources and display devices etc.