采用高温固相法合成Ba₅CaAl₄O₁₂:Tb³⁺绿色荧光粉,并对其发光性质进行研究。Ba₅CaAl₄O₁₂:Tb³⁺在239 nm 激发下,跃迁发射峰值位于489,543,550,587 和623 nm,分别对应于Tb3+的5D4→7F6,5D4→7F5,5D4→7F4和 5D4→7F3的能级跃迁。样品的紫外激发光谱表明,Ba₅CaAl₄O₁₂:Tb³⁺基质吸收是位于240 nm附近的宽带吸收。研究 Tb3+浓度对样品发光强度的影响,当Tb3+掺杂摩尔分数为4%时,发光强度达到最大。加入H3BO3和NH4Cl 两种助熔剂均不同程度地提高了该荧光粉的发光强度,且随着助熔剂浓度的增加发光强度先逐渐增强后下降。相比两种助熔剂发现,NH4Cl 比H3BO3的效果更好,更有利于荧光粉的发光。

The Ba₅CaAl₄O₁₂:Tb³⁺ phosphor was synthesized by high temperature solid state reaction,and its luminescent properties were investigated. The emission spectrum of Ba₅CaAl₄O₁₂:Tb³⁺ excited by 239 nm light shows four major emission peaks locating at 489,543,550,587 and 623 nm corresponding to the 5D4→7F6,5D4→7F5,5D4→7F4 and 5D4→7F3 typical transitions of Tb3+,respectively. The UV excitation spectra indicates that the host absorption is located at about 240 nm. The effect of the molar concentration Tb3+ on the emission intensity is studied. The result shows that the emission spectrum intensity reaches the maximum value when the mole fraction of Tb3+ is 4%. Fluxing H3BO3 and NH4Cl on the sample increases the luminescent intensity in various degree. The emission spectrum intensity increases with increasing the H3BO3 and NH4Cl concentration,and then decreases. Compared with the fluxing H3BO3,the NH4Cl can enhanced the luminescent intensity better.