中文摘要：

采用溶胶凝胶与沉淀相结合的方法和单一溶胶凝胶法制备Eu^3＋：Y2O3-3Si O2发光材料,通过DTA-TG、IR、XRD、TEM、激发光谱、发射光谱研究了材料的结构和发光性能。研究表明：两种方法制得的发光材料成分完全相同,但结构、形貌和发光性质有较大差别。IR确定结合法制备的材料主要存在Si-O-Si桥氧键,而单一法主要存在非桥氧的Si-O键;XRD确定结合法存在立方相的Y2O3,单一法主要存在非晶态Si O2,TEM显示结合法的形貌为纳米级球形Y2O3,单一法为纳米级棒状Y2O3。两种方法制得的样品Eu^3＋：Y2O3-3Si O2都显示Eu^3＋的特征发射峰位于613 nm;最佳激发峰分别在紫外区的257 nm和395 nm;两种方法制得的样品在相应最佳激发波长下,结合法制备出的荧光材料其发光强度和色纯度相对较高,半宽峰约为7 nm,两种方法制得的发光材料最佳退火温度均为800℃,Eu^3＋的最佳掺杂量均为6.0%。

英文摘要：

Red phosphor Eu^3＋：Y2O3-3SiO2 materials were synthesized by a Sol-gel method and a combination of Sol-gel and precipitation method, respectively. The crystal structure and the luminescent properties of the prepared samples were characterized by DTA-TG, IR, XRD, TEM and excitation and emission spectra, respectively. The results show that the compositions of the two luminescent materials prepared are identical, but their structure, morphology and luminescence properties are different. IR, XRD and TEM results show that the samples prepared by the combination method are mostly composed of Si-O-Si bonds with Cubic phase Y2O3 and nano-sphere structure, while the other one is mostly composed of Si-O bonds with Amorphous SiO2 and nano-rod Y2O3 structure. Both samples show the characteristic Eu^3＋ emission peak at 613 nm with optimum excitation peaks in the ultraviolet region of near 257 nm and 395 nm. The material prepared by the combination method is relatively high in luminous intensity and color purity with peak half-width of 7 nm. The optimal annealing temperature of both samples is 800℃ and the optimum Eu^3＋ doping concentration is 6.0%.