Eu3+激活K2CaP2O7荧光粉的制备和发光性质

采用高温固相法制备了系列不同浓度Eu³⁺离子掺杂的K₂CaP₂O₇红色荧光粉。通过X射线衍射、扫描电子显微镜、荧光光谱和荧光寿命曲线等手段对荧光粉的物相结构、形貌以及发光性质进行了研究。结果表明所制备的荧光粉均属于单斜结构，Eu³⁺离子掺杂没有引起晶体结构明显变化，荧光粉形貌不规则，颗粒为微米量级且部分发生团聚。在393 nm紫外光激发下，荧光粉显示出红光发射，最强发射峰位于613 nm。Eu³⁺离子掺杂浓度对发光强度有显著影响，最佳掺杂摩尔分数为0.08，由此计算能量传递临界距离为1.61 nm。荧光寿命受掺杂浓度影响较小，当Eu³⁺掺杂摩尔分数为0.005~0.10时，荧光寿命在2.45~2.58 ms范围内。变温发射光谱显示，测试温度为150℃时，荧光粉的发光强度为室温的73%。研究表明，Eu³⁺离子掺杂的K₂CaP₂O₇是性能较好的红色荧光粉。

Preparation and Luminescence Properties of Eu3+ Activated K2CaP2O7 Phosphors

A series of Eu³⁺ doped K₂CaP₂O₇ phosphors were prepared by high temperature solid state reaction method. The phase structure, morphology, luminescence properties of the phosphors were investigated by XRD, SEM, luminescence spectra and luminescence decay curves. The results show that all the phosphors have monoclinic structure, the doping of Eu³⁺ ions does not significantly influence the structure of K₂CaP₂O₇ host lattice. The phosphors exhibit irregular morphology with the particle size of several microns. Under 393 nm excitation, Eu³⁺ doped K₂CaP₂O₇ samples emit red lights with the most intense peak at 613 nm. The optimal doping concentration of Eu³⁺ is 0.08 in the host, the critical energy transfer distance between Eu³⁺ ions is calculated to be 1.61 nm. The doping concentration has little influence on the decay time of Eu³⁺, the decay times of all the samples are in the 2.45-2.58 ms range. Moreover, the relative emission intensity maintains 73% of its original intensity when the temperature reaches 150℃. All the above results indicate that Eu³⁺ doped K₂CaP₂O₇ may be a potential red phosphor.