利用高温固相反应法制备出Ba3Bi2-x(PO4)4∶xTb3+(x=0.05,0.1,0.15,0.3,0.4,0.5)绿色荧光粉。通过X射线衍射仪、扫描电子显微镜、积分球式分光光度计和荧光光谱仪等对样品进行了分析。结果表明,所制备的样品均为Ba3Bi2(PO4)4纯相,Ba3Bi1.7(PO4)4∶0.3Tb3+的带隙估计值为4.21 eV。当激发光的波长为377 nm时,样品的发射光谱的波峰位于543 nm、584 nm和619 nm处,分别对应于Tb3+的5D4→7F5、5D4→7F4和5D4→7F3的能级跃迁。随着Tb3+掺杂浓度的增加,样品的发光强度先增强后减弱,当x=0.3时,发光强度最大。计算表明最近邻离子在Ba3Bi2-x(PO4)4∶xTb3+荧光粉的浓度猝灭中起主要作用。随着测试温度的升高,发光强度变化不大,表明样品具有优异的热稳定性能。CIE色坐标图表明所制备的样品可以被紫外光有效激发而发出绿光。

Ba3Bi2-x(PO4)4∶xTb3+ (x=0.05, 0.1, 0.15, 0.3, 0.4, 0.5) green phosphors were prepared by high-temperature solid phase reaction. Samples were analyzed by X-ray diffraction apparatus, scanning electron microscopy, spectrophotometer, and fluorometric spectrometer. The results show that all samples are Ba3Bi2(PO4)4 pure phase. The band gap of Ba3Bi1.7(PO4)4∶0.3Tb3+ is estimated to be 4.21 eV. At the excitation of 377 nm, the peak of emission spectra of samples are 543 nm, 584 nm, and 619 nm, corresponding to the energy level transitions of 5D4→7F5, 5D4→7F4 and 5D4→7F3 of the Tb3+ ions, respectively. As the doping concentration of Tb3+ ions increases, the luminous intensity of the sample increases first and then decreases. When x is 0.3, the luminous intensity reaches the maximum. The calculations indicate that the nearest neighbor ion plays a major role in the concentration quenching of Ba3Bi2-x(PO4)4∶xTb3+ phosphors. The luminous intensity changes little with the test temperature increases, indicating excellent thermal stability of the sample. The CIE chromaticity coordinate indicates that the prepared samples can emit green light when excited by UV light.