共查询到19条相似文献,搜索用时 115 毫秒
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水热法制备Y2O3:Eu3+微米棒及其荧光性能表征 总被引:1,自引:0,他引:1
利用水热法制备了Y2O3和Y2O3:Eu3+,探讨了反应温度、反应时间及氢氧化钠溶液浓度对产物晶型的影响,确定了生成较好晶型的反应条件为:反应温度180℃,反应时间24 h,氢氧化钠溶液浓度2 mol/L. 研究了Y3+和Eu3+的配比对Y2O3:Eu3+荧光性能的影响. 结果表明,当n(Y3+):n(Eu3+)的比例为100:5时,其荧光强度最佳. TEM分析表明,Y2O3:Eu3+粉末具有直径约0.2~0.6 mm、长度为几到十几微米的棒状结构. 相似文献
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用溶胶凝胶法制备了Eu3+单掺LiCaPO4荧光粉,探究了Eu3+的掺杂浓度、退火温度对荧光粉发光性能的影响.实验结果表明,当反应温度为900℃、退火时间为2 h、Eu3+掺杂浓度为5mol%时,荧光粉发光强度最强.XRD结果表明,样品为六方晶系Ca3(PO4)2与LiCaPO4的混相.利用CIE进行计算,结果表明,E... 相似文献
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采用共沉淀法制备了Eu3+、Tb3+单掺或双掺的BaWO4荧光粉,探究了Eu3+的掺杂浓度、退火温度及Eu3+和Tb3+掺杂摩尔比对荧光粉发光性能的影响.实验结果表明,当反应温度为500℃、退火时间为2h、Eu3+掺杂浓度为5 mol%时,荧光粉发光强度最强.XRD结果表明,样品为立方晶系的BaWO4相.在掺杂Eu3+... 相似文献
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通过Eu3+掺杂TiO2制备TiO2:Eu3+增效层,采用XRD、SEM、UV-Vis对TiO2:Eu3+增效层进行表征,并对T iO2:Eu3+钙钛矿太阳能电池的光电性能进行分析.结果表明,将T iO2:Eu3+增效层引入钙钛矿太阳能电池,有效提升了电池的短路电流和开路电压,T iO2:Eu3+钙钛矿太阳能电池具有较... 相似文献
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本文利用液相沉积法合成白光LED用的Gd2(MoO4)3:Eu3+红色荧光粉,利用X射线衍射、荧光光谱以及扫描电镜进行系列表征,系统研究掺杂离子浓度、退火温度等条件对Gd2(MoO4)3:Eu3+荧光粉的发光性能影响。结果表明:当pH=7,退火温度为1100℃,Gd:Eu摩尔比例为1.8:0.2时,所合成的荧光粉为正交晶系的类白钨矿结构Gd2(MoO4)3化合物(20-0408),荧光粉在395 nm左右有高的激发效率,发射主峰位置位于615 nm是近紫外LED中一种比较有应用价值的红色荧光粉。 相似文献
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Wavelength converters in white light-emitting diodes are usually made by sintering of phosphor-glass powder compacts. An issue is that the sintering process usually results in the reduction of phosphor amount. In the present study, composites containing CaAlSiN3:Eu2+ red phosphor and Bi2O3-B2O3-ZnO-Sb2O5 glass were fabricated by sintering method. Influences of CaAlSiN3:Eu2+ phosphor content (10 vol%–30 vol%) and sintering temperature (410–430°C) on the residual amount of the phosphor phase and the resulting luminescence intensity of the composites were investigated. The change of CaAlSiN3:Eu2+ content due to sintering was analyzed by X-ray diffraction. The interdiffusion between the CaAlSiN3:Eu2+ and glass matrix was examine by scanning electron microscope equipped with energy dispersive X-ray spectrometry. This paper focuses on the change of luminescence intensity after sintering. It was found that although the content of phosphor CaAlSiN3:Eu2+ reduces after sintering; the luminescent intensity of the composites anomalously increases. The optimum luminescence intensity is 14% higher than that of the as-mixed, unfired powder. It is proposed that the incorporation of Bi3+ ions from the glass matrix into the phosphor CaAlSiN3:Eu2+ during sintering improves the luminescence ability of the phosphor particles. 相似文献
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采用改进高温固相法合成了掺杂Eu3+和Dy3+作为共激活离子的红色长余辉磷光体,详细阐述了Eu3+、Dy3+对CaTiO3:Pr3+红色磷光体发光性能的影响.通过X-射线衍射仪和电子扫描显微镜对所得样品的晶相类型及表面形态进行了表征,结果发现,在一定灼烧温度下,Eu3+或/和Dy3+对晶相的作用是协同的,且Eu3+或/和Dy3+对CaTiO3:Pr3+红色磷光体的粒径也有影响.室温条件下采用荧光/磷光发光光度计对其发光性能进行测定,结果表明,一定量的Eu3+或/和Dy3+能显著改善CaTiO3:Pr3+红色磷光体的发光性能. 相似文献
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以碳酸锂、氧化铝、二氧化硅、Eu2O3为原料,采用传统高温固相法在较低温度下制备Eu3+离子掺杂LiAlSiO4红色荧光粉,并通过XRD、SEM和光致发光光谱分别对其晶体结构,粉体形貌和发光性能进行表征。结果表明:Eu3+离子掺杂浓度低于15%时,样品为单一基质;样品可以被近紫外350~420nm波段高效激发,最强激发峰位置位于394nm,发射光谱呈现出Eu3+的特征峰,谱带峰值位置在593 nm、616 nm,分别对应于Eu3+的5D0→7F1、5D0→7F2特征跃迁。最强发射对应的掺杂摩尔百分含量为12%,浓度猝灭的发生主要是因为四极-四极(q-q)相互作用,CIE坐标为(0.6464,0.3526),可应用于近紫外芯片激发LED用红色荧光粉。 相似文献
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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Eu3+: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Eu3+:Y2O3-3Si O2都显示Eu3+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℃,Eu3+的最佳掺杂量均为6.0%。 相似文献
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Effects of Al content on the formation and the photoluminescence properties of CaAlSiN3:Eu2+ phosphor (CASIN) were investigated by a combustion synthesis method. XRD (X-ray diffraction), combined with PL (photoluminescence), TEM-EDS (transmission electron microscope equipped with an energy-dispersive X-ray spectroscope), and SAED (selected area electron diffraction) measurements, show that the bar-like CASIN gives a stronger emission than the plate-like and agglomerated fine particles. The emission intensity increases as the Al content increased from Al = 0.2 to Al = 0.8, which resulted from the extent of formation of CASIN increases. Then, the emission intensity decreases as the Al content is increased from Al = 0.8 to Al = 1.5, which resulted from the transformation of morphology of CASIN and a large amount formation of AlN. In addition, the extent of formation of CASIN increases with increasing Al from Al = 0.2 to Al = 1.2 and begins to decrease as Al is further increased to 1.5, and thus the peak emission wavelength increases from 647 nm to 658 nm as the Al molar ratio is increased from 0.2 to 1.2 and begins to decrease when further increasing the Al molar ratio to 1.5, which resulted from the large amount of AlN formed. 相似文献
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Li+作为电荷补偿剂可以提高Sr3ZnNb2O9:Eu3+荧光粉的发光强度和热稳定性。本文通过高温固相反应成功制备了Sr3ZnNb2O9:xEu3+,yLi+(0≤x≤0.5,0≤y≤0.5)荧光粉,为了鉴定和描述样品的物相、发光特性和热稳定性,进行了XRD和发光光谱测试。结果表明:Eu3+和Li+已经成功掺入到基质材料中,并取代Zn2+位点;Li+的最佳掺杂浓度为0.3(摩尔分数),浓度猝灭类型是在最近邻离子之间;掺杂Li+提高了荧光粉的热稳定性,活化能为0.193 eV,CIE色坐标为(0.651,0.349),非常接近国际照明委员会规定的标准色坐标。 相似文献