Effect of PEG Addition on the Properties of YAG:Ce Phosphor Synthesized via a Homogeneous Precipitation Method

摘要:

在均相沉淀法制备YAG:Ce荧光粉前驱体的过程中，分别将分子量为6000和10000的聚乙二醇（PEG）作为分散剂添加到反应体系中。傅里叶变换红外光谱结果未发现不同分子量聚乙二醇的加入会对所制得的YAG:Ce前驱体产物的化学组成产生明显影响。相比于未添加聚乙二醇的样品，扫描电子显微镜（SEM）图像显示随着聚乙二醇的加入荧光粉的颗粒尺寸明显减小。在添加聚乙二醇的样品中，差示扫描量热分析（DSC）和X射线衍射（XRD）的结果证实了在钇铝石榴石（YAG）的结晶过程中没有任何中间相的形成，表明聚乙二醇的加入能够显著地促进YAG晶相的形成并且同时抑制Ce3+的氧化反应，最终大幅提高YAG:Ce荧光粉的荧光性能。

Abstract:

YAG:Ce precursors were synthesized via a homogeneous precipitation method with the addition of different molecular mass of PEG (PEG 6000 and PEG 10000) used as dispersant. The FT-IR spectra show that no significant difference is found between the precursors. SEM images indicate that the size of the primary particles with PEG is much smaller than that of the sample without PEG. Confirmed by the DSC traces and X-ray diffraction (XRD), the crystallization of YAG is a one-step process without any intermediate phase. The crystallization of YAG is significantly promoted and the oxidation of Ce3+ is inhibited by addition of PEG, which enhances the luminescent properties of YAG:Ce phosphor.