工艺参数对气压烧结制备CaAlSiN_3:Eu^(2+)荧光粉性能的影响

The Effects of Process Parameters on the Luminescence Properties of CaAlSiN_3:Eu^(2+) Phosphor Prepared by Gas Pressure Sintering

采用气压烧结法制备了用于暖白光LED的红色氮化物CaAlSiN_3:Eu^(2+)荧光粉,利用X射线衍射仪(XRD)、扫描电镜(SEM)、荧光光谱仪(PL)对其物相组成、微观形貌、发光性能进行了表征。结果表明:在Eu^(2+)浓度为2mol%、反应温度为1700°C、反应压力为0.65MPa时,急冷温度为1200°C得到的荧光粉结晶最好,发光强度最强。通过改变急冷温度可以使发射峰波长从637nm红移到646nm,这是一种新的调控荧光粉发射峰的手段。经过酸洗后,荧光粉的发射峰强度可以提高约9.3%。

CaAlSiN3:Eu2+red-emitting nitride phosphors applied to warm white LED were prepared by gas pressure sintering. The phase composition, surface morphology and luminescence properties were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and fluorescence spectrophotometer (PL). The results indicated that CaAlSiN3:Eu2+ phosphors had a well-crystallized phase and excellent luminescence intensity under the condition that sintering temperature was 1700?C, pressure was 0.65 MPa, Eu2+ content was 2 mol% and quenchingtem perature was 1200?C. Interestingly, the emission peak position of CaAlSiN3:Eu2+ phosphor prepared by altering quenching temperature could be shifted from 637 nm to 646 nm, which was considered a new means tuning the luminescence properties. The emission peak intensity could be improved by roughly 9.3% after acid washing.