通过高温固相反应合成YVO4∶xTm(x=0.001,0.003,0.005,0.007,0.01,0.03,0.05)蓝色系列粉末状发光材料。经X射线衍射分析产物为单相, 属四方锆英石结构, 其结果与JCPDS标准卡(72-0861)相符。检测了材料的真空紫外激发光谱和发射光谱。YVO4∶xTm的真空紫外激发光谱在120~350 nm范围内为连续的带状峰, 在155 nm和333 nm附近有明显的峰值。在155 nm激发下, YVO4∶xTm的发射光谱由两部分组成, 其中主发射峰在474 nm附近呈一尖锐的线状, 来自Tm3+的1G4→3H6跃迁; 在650 nm左右有一弱发射峰, 来自Tm3+的1G4→3H4跃迁。另外, 还有一较弱的带状发射, 中心位于540 nm左右, 来自样品的VO3-4离子的宽带发射。随着Tm3+摩尔分数x由0.001增加到0.005, Tm3+发射光谱强度逐渐增加到最大值。之后随着x继续增加, 发射光谱强度逐渐下降, 呈现明显的浓度猝灭现象。通过对YVO4∶xTm的光谱分析及其发光机理进行推导, 认为YVO4∶Tm3+在紫外及真空紫外激发下, 是一种具有较高发光效率以及色纯度较好的蓝色发光材料。

Series of blue phosphors YVO4∶xTm (x=0.001, 0.003, 0.005, 0.007, 0.01, 0.03, 0.05) were synthesized by the high temperature solid state reaction in this paper. X-ray diffraction shows that the product is a tetragonal zircon structured single phase. The result is consistent with JCPDS standard card (72-0861). The vacuum UV excitation spectrum and emission spectra of the phosphors at room temperature were also detected. The vacuum UV excitation spectrum of YVO4∶xTm includes a continuous banded peak in the range of 120-350 nm, and there are two significant peaks at 155 nm and 333 nm. Excited by 155 nm, the emission spectrum of YVO4∶xTm consists of two parts. The main emission spectrum at 474 nm is a sharp peak, caused by 1G4→3H6 transition of Tm3+. The weaker emission peak is at 650 nm, which is generated by 1G4→3H4 transition of Tm3+. In addition, there is a weak band emission centering around 540 nm, which presents broadband emission of VO3-4 ions. With the increasing of Tm3+ mole fraction (x) from 0.001 to 0.005, the emission intensity gradually increases to a maximum value. Then, as x increases continuously, the emission intensity decreases gradually, presents an obvious concentration quench. By analyzing the spectra of YVO4∶xTm and its luminescent mechanism, it can be derived that YVO4∶Tm3+ is a kind of blue phosphor material with high luminous efficiency and color purity under ultraviolet or vacuum ultraviolet excitation.