一种铥激活硼酸盐蓝色荧光粉的合成及性能研究

Synthesis and Properties Research of a Thulium Activated Borate Blue Phosphor

通过高温固相法在750℃煅烧混合物PbO、Gd2O3、B2O3、Tm2O3,制备出一系列蓝色发光材料PbGd1-xTmxB7O13。用X射线衍射法(XRD)确定其为纯相,并且Tm^3+离子成功进入基质PbGdB7O13中Gd^3+离子位置,而不引起结构发生变化。通过荧光分光光度计研究了其发光性能,在356 nm近紫外光激发下,材料可发射出一尖锐的蓝色发射峰,峰值位于453 nm,归因于激活离子Tm^3+的1D2→3F4能级跃迁。通过优化一系列Tm^3+离子掺杂浓度,发现最佳掺杂浓度为x=0.04,超过此浓度将发生浓度猝灭效应,主导机制是偶极-偶极相互作用。因此我们认为PbGd1-xB7O13∶xTm^3+作为蓝色荧光粉,具有潜在的应用价值。

A series of blue luminescent materials PbGd1-xTmxB7O13 are synthesized burning mixture of PbO,Gd2O3,B2O3 and Tm2O3 at 750℃by high temperature solid-state method.The results of X-ray powder diffraction(XRD)show that Tm^3+ions have inserted into the location of Gd^3+in PbGdB7O13 matrix successfully without the change of structure.The luminescent properties are studied by fluorescence spectrophotometer.A sharp peak of blue-light in emission spectrum locates at 453 nm,attributing to the 1D2→3F4 transition of Tm^3+.With the increasing of Tm^3+dopant concentrations,the emission intensity enhances and then decreases due to the concentration quenching effect.The optimum doped concentration of Tm^3+ions is x=0.04.The concentration quenching effect will occur over this concentration.The dominant mechanism is d-d interaction.As a result,we may expect that the obtained phosphor PbGd1-xTmxB7O13 would be potentially used as blue phosphors,have potential value.