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采用溶液燃烧法在600℃成功合成了(BaxMg)2/(x+1)Al10O17∶Eu2+(0.6≤x≤1.2)蓝色荧光粉,着重研究了基质阳离子Ba/Mg比值的变化对其晶体结构及发光特性的影响。结果表明,合成的产物为纯相,且随Ba/Mg比值的增加,样品的晶格参量逐渐增加;当Ba/Mg比增加时,发射光谱的强度明显增强,至Ba/Mg为0.9时达到最大值,然后随Ba/Mg比继续增大,发射光谱的强度反而下降;Ba/Mg比值减少,导致基质的晶场增强和电子云膨胀效应的发生,致使Eu2+发射主峰向长波方向移动。Eu2+的掺杂浓度对样品的发光性能有显著的影响,随Eu2+浓度增大,发光中心增多,Eu2+离子间相互作用增强,能量传递加快,发光强度逐渐增大,并达到一个最大值。此后,随Eu2+的浓度进一步增加,Eu2+之间的能量传递速率将超过发射速率,呈现浓度猝灭特性。
The blue phosphor of (BaxMg) 2 / (x + 1) Al10O17:Eu2 + (0.6≤x≤1.2) was successfully synthesized by solution combustion at 600 ℃. The effects of the variation of Ba / Mg ratio on the crystal structure And light-emitting characteristics of the impact. The results show that the synthesized product is pure phase, and the lattice parameter increases with the increase of Ba / Mg ratio. When the ratio of Ba / Mg increases, the intensity of the emission spectrum increases obviously. When Ba / Mg is 0.9, Then the intensity of the emission spectrum decreases with the increase of Ba / Mg ratio. The decrease of Ba / Mg ratio leads to the enhancement of the crystal field of the matrix and the expansion of the electron cloud, resulting in the emission of the main peak of Eu2 + toward the longwave. Eu2 + doping concentration has a significant effect on the luminescence properties of the samples. With the increase of Eu2 + concentration, the luminescence center increases, the interaction between Eu2 + ions increases, the energy transfer accelerates, and the luminescence intensity increases to a maximum. Since then, with the further increase of Eu2 + concentration, the energy transfer rate between Eu2 + will exceed the emission rate, showing the concentration quenching property.