Sr_(7)Zr(PO_(4))_(6):xEu^(2+)蓝色荧光粉的合成及其发光特性

Synthesis and Luminescent Properties of Blue Emitting Phosphor Sr_(7)Zr(PO_(4))_(6):xEu^(2+)

通过高温固相反应合成了新型的蓝色荧光粉Sr_(7)Zr(PO_(4))_(6):xEu^(2+)。通过X射线粉末衍射(XRD)、紫外可见(UV-Vis)吸收光谱、荧光光谱研究了Sr_(7)Zr(PO_(4))_(6):xEu^(2+)材料的相纯度及荧光性质。结果表明,Eu^(2+)掺杂获得的Sr_(7)Zr(PO_(4))_(6):xEu^(2+)荧光粉为纯相,且200-400 nm范围内的近紫外(NUV)光均能对其进行有效的激发。在315 nm的激发下,Sr_(7)Zr(PO_(4))_(6):xEu^(2+)荧光粉发射出峰值位于415 nm左右的蓝光,且Eu^(2+)在Sr_(7)Zr(PO_(4))_(6)基质中的最佳掺杂浓度为0.05,相应的CIE色度坐标为(0.164,0.021),比商用BaMgAl_(10)O_(17)∶Eu^(2+)(BAM)蓝色荧光粉具有更高的色纯度。

A novel blue-emitting phosphor Sr_(7)Zr(PO_(4))_(6):xEu^(2+)was synthesized for the first time via a traditional solidstate reaction method. Phase purity and luminescence properties of these phosphors were studied by X-ray powder diffraction, UV-Vis spectra, and fluorescence spectra. X-ray diffraction results confirmed the pure phase of Eu^(2+) doped Sr_(7)Zr(PO_(4))_(6) materials and they could be efficiently pumped by the near-ultraviolet(NUV) light region from 200 to 400 nm. Excited by 315 nm, Sr_(7)Zr(PO_(4))_(6):xEu^(2+)exhibited a strong and broad emission band ranging from 380 to 480 nm with a maximum peak at 415 nm. The concentration quenching mechanism of Eu^(2+) in Sr_(7)Zr(PO_(4))_(6) was electric dipole-electric dipole interaction, and the critical distance for energy transfer was 2.71 nm. The optimal concentration of Eu^(2+) was 0.05 and the corresponding CIE chromaticity coordinate was(0.164, 0.021), exhibiting higher color purity than commercial BaMgAl_(10)O_(17)∶Eu^(2+)(BAM) blue phosphor.