Peculiar Optical Characteristics of Different Silicate Source and Synthesis Technique in Europium Doped Li2SrSiO4
Peculiar Optical Characteristics of Different Silicate Source and Synthesis Technique in Europium Doped Li2SrSiO4
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DOI：
10.3938/jkps.72.1350
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发表时间：
2018-06
影响因子：
0.6
通讯作者：
Hyun-Joo Woo;Y. Horibe;K. Jha;K. Jang;J. Jeong
中科院分区：
文献类型：
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作者：
Hyun-Joo Woo;Y. Horibe;K. Jha;K. Jang;J. Jeong
本文采用丙二醇改性硅烷辅助溶胶-凝胶法和固相反应法制备了二价和三价Eu(2+/3+)离子掺杂的硅酸盐荧光粉。对其结构、形态和光学性质进行了详细的研究。用PGMS辅助的溶胶-凝胶法合成的Li2SrSiO4：Eu3+荧光粉的发光强度比SSR法制备的提高了10倍以上。而用PGMS法制备的Li2SrSiO4：Eu2+荧光粉的发光性能较差，仅为SSR法制备的发光材料的三分之一。用不同硅酸盐(Si)源用SSR方法合成的Eu3+掺杂Li2SrSiO4显示出特殊的光学性质，这是首次报道。研究结果表明，除了样品制备方法外，硅酸盐基质中掺杂Eu(3+/2+)的光学性质还可以通过改变硅源来调节。这些结果为理解这种光学性质的机制和开发白光LED的新材料开辟了一条道路。
In this work, a silicate based phosphor doped with divalent and trivalent europium (Eu(2+/3+)) ions have been synthesized by two different synthesis processes, PGMS (propylene glycol modified silane) assisted sol-gel and solid state reaction (SSR) method. The structural, morphological and optical properties were studied in detail. The emission intensity of Li2SrSiO4:Eu3+ phosphors synthesized through the PGMS assisted sol-gel increased up to 10 times more than that prepared by SSR method. However, Li2SrSiO4:Eu2+ phosphor prepared by PGMS exhibited lower emission characteristics and decreased to one-third of that prepared by SSR. The Eu3+ doped Li2SrSiO4 synthesized by SSR method using different silicate (Si) sources revealed peculiar optical properties and this is the first kind of its report. The obtained results suggest that the optical properties of Eu(3+/2+) doped in silicate host can be regulated by the alteration of Si source besides sample preparation method. These results open a way to understand the mechanisms responsible for such optical properties and to develop new materials for white LEDs.