Structural and optical properties of YAG:Ce3+ phosphors by sol-gel combustion method
Structural and optical properties of YAG:Ce3+ phosphors by sol-gel combustion method
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DOI：
10.1016/j.jcrysgro.2005.01.072
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发表时间：
2005-06-01
影响因子：
1.8
通讯作者：
Xu, J
中科院分区：
文献类型：
--
作者：
Xia, GD;Zhou, SM;Xu, J
采用溶胶-凝胶燃烧法合成了高质量的Ce 3+掺杂Y3 Al 5 O 12（YAG：Ce 3+）荧光粉。在这种溶胶-凝胶燃烧过程中，柠檬酸作为燃烧的燃料，捕获组成阳离子，并减少前体的扩散长度。XRD和FT-IR结果表明，在900 ℃下烧结2 h，可形成YAG相。该温度远低于通过固态反应法合成YAG相所需的温度。在烧结过程中没有观察到YAlO 3（雅普）和Y 4Al 2 O 9（YAM）等中间相。在900-1100 ℃下烧结的磷光体的平均晶粒尺寸为约40 nm。随着烧结温度的升高，Ce 3+离子的晶化程度提高，分布均匀，发光强度增强。随着烧结温度从900 ℃增加到1200 ℃，在YAG：Ce 3+磷光体的Ce 3+发射光谱中已经观察到蓝移。这可以解释晶格常数的减小影响了Ce ~（3+）离子周围的晶场。0.06Ce掺杂的YAG荧光粉的发光强度比0.04Ce和0.02Ce掺杂的YAG荧光粉的发光强度高得多。在较高的Ce ~（3+）浓度下的红移可能是Ce-Ce相互作用或YAG：Ce ~（3+）和YAG之间的晶胞参数的变化。可以得出结论，溶胶-凝胶燃烧合成方法提供了一个良好的分布在YAG基质中的分子水平上的Ce 3+激活剂。(c)2005 Elsevier B. V.保留所有权利。
High-quality Ce3+-doped Y3Al5O12 (YAG:Ce3+) phosphors were synthesized by a facile sol-gel combustion method. In this sol-gel combustion process, citric acid acts as a fuel for combustion, traps the constituent cations and reduces the diffusion length of the precursors. The XRD and FT-IR results show that YAG phase can form through sintering at 900 degrees C for 2 h. This temperature is much lower than that required to synthesize YAG phase via the solid-state reaction method. There were no intermediate phases such as YAlO3 (YAP) and Y4Al2O9 (YAM) observed in the sintering process. The average grain size of the phosphors sintered at 900-1100 degrees C is about 40 nm. With the increasing of sintering temperature, the emission intensity increases due to the improved crystalline and homogeneous distribution of Ce3+ ions. A blue shift has been observed in the Ce3+ emission spectrum of YAG:Ce3+ phosphors with increasing sintering temperatures from 900 to 1200 degrees C. It can be explained that the decrease of lattice constant affects the crystal field around Ce3+ ions. The emission intensity of 0.06Ce-doped YAG phosphors is much higher than that of the 0.04Ce and 0.02Ce ones. The red-shift at higher Ce3+ concentrations may be Ce-Ce interactions or variations in the unit cell parameters between YAG:Ce3+ and YAG. It can be concluded that the sol-gel combustion synthesis method provides a good distribution of Ce3+ activators at the molecular level in YAG matrix. (c) 2005 Elsevier B.V. All rights reserved.