Crystal structure of EU2+-doped M3MgSi2O2 (M: Ba, Sr, Ca) compounds and their emission properties
Crystal structure of EU2+-doped M3MgSi2O2 (M: Ba, Sr, Ca) compounds and their emission properties
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DOI：
10.1016/j.jssc.2008.11.032
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发表时间：
2009-03-01
影响因子：
3.3
通讯作者：
Kinomura, Nobukazu
中科院分区：
文献类型：
--
作者：
Yonesaki, Yoshinori;Takei, Takahiro;Kinomura, Nobukazu
从晶体结构的角度讨论了Eu ~（2+）掺杂M_3MgSi_2O_8（M：Ba，Sr，Ca）的发光特性。当Ba ~（2+）离子占M ~（2+）离子的1/3以上时，M_3MgSi_2O_8晶体呈玻辉岩型三方结构，而不含Ba的化合物晶体呈镁橄榄石型单斜结构。在紫外光激发下，无论Ba ~（2+）、Sr ~（2+）和Ca ~（2+）离子的摩尔比如何，Eu ~（2+）掺杂的玻璃石型化合物均在435 nm处产生强烈的蓝色荧光，归属于5d-4f电子跃迁。相比之下，Eu 2+掺杂的镁橄榄石型化合物显示出对该比率敏感的发射颜色。对发射光谱的详细分析表明，Eu ~（2+）掺杂的M_3MgSi_2O_8的发射色度由两个发射峰组成，反映了M_2+离子的两个不同位置。(C)2008年爱思唯尔公司All rights reserved.
Emission properties of Eu2+-doped M3MgSi2O8 (M: Ba, Sr, Ca) are discussed in terms of the crystal structure. When Ba2+ ions account for over one third of M2+ ions, M3MgSi2O8 crystallize in glaserite-type trigonal structure, while Ba-free compounds crytallize in merwinite-type monoclinic Structure. Under UV excitation, the Eu2+-doped glaserite-type Compounds exhibit an intense blue emission assigned to 5d-4f electron transition at about 435 nm, regardless of the molar ratio of Ba2+, Sr2+ and Ca2+ ions. By contrast, the Eu2+-doped merwinite-type compounds show an emission color sensitive to the ratio. A detailed analysis of the emission spectra reveals that the emission chromaticity for the Eu2+-doped M3MgSi2O8 is composed of two emission peaks reflecting two different sites accommodating M2+ ion. (C) 2008 Elsevier Inc. All rights reserved.