采用高温固相法制备了Ca9Al(PO4)7: Eu2+蓝色荧光粉, 研究了Ca9Al(PO4)7: Eu2+的发光、浓度猝灭及温度稳定性.Ca9Al(PO4)7: Eu2+的激发光谱覆盖200~350 nm紫外区; 发射光谱为一主峰位于445 nm的宽谱, 对应Eu2+的4f65d1→4f7特征跃迁.研究发现, 随Eu2+掺杂量的增大, Ca9Al(PO4)7: Eu2+的发射强度呈现先增大、后减小的变化趋势, 最大发射强度对应的Eu2+掺杂量为0.01, 即存在浓度猝灭效应, 对应的机理为电偶极-电偶极相互作用; 依据晶格常数, 得出临界距离为2.297 nm.在25~300 ℃范围内改变光谱测量温度, 发现温度升高到150 ℃时, Ca9Al(PO4)7: Eu2+的发射强度变为25 ℃时的81.0%, 对应的激活能为0.268 eV, 说明材料具有较好的温度稳定性.

Ca9Al(PO4)7: Eu2+ blue emitting phosphor was synthesized by high temperature solid state method. Luminescence, concentration quenching and thermal stability of Ca9Al(PO4)7: Eu2+ were investigated. Excitation spectrum of Ca9Al(PO4)7: Eu2+ extended from 200 nm to 350 nm. Under an ultraviolet excitation, Ca9Al(PO4)7: Eu2+ showed a broad emission band with a maximum at 445 nm, which corresponded to 4f65d1→4f7 transition of Eu2+. Emission intensities of Ca9Al(PO4)7: Eu2+ were influenced by Eu2+ concentration, and they enhanced with increasing Eu2+ concentration, and reached a maximum value at 0.01 Eu2+, then decreased with further increasing Eu2+ concentration because of concentration quenching effect. The concentration quenching mechanism was verified to be dipole-dipole interaction. According to crystal structure data, critical distance can be obtained to be 2.297 nm. The emission intensity of Ca9Al(PO4)7: Eu2+ as a function of temperature was explored. When temperature turned up to 150 ℃, the emission intensity of Ca9Al(PO4)7: Eu2+ was 81.0% of the initial value at 25 ℃, and the corresponding activation energy was calculated to be 0.268 eV, which could prove the thermal stability of Ca9Al(PO4)7: Eu2+.