Eu-doped CaAl2Si2O8 nanocrystalline phosphors crystallized from the CaO-Al2O3-SiO2 glass system
Eu-doped CaAl2Si2O8 nanocrystalline phosphors crystallized from the CaO-Al2O3-SiO2 glass system
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DOI：
10.1149/1.2712834
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发表时间：
2007-01-01
影响因子：
3.9
通讯作者：
Yasumori, Atsuo
中科院分区：
文献类型：
--
作者：
Ohgaki, Takeshi;Higashida, Akihisa;Yasumori, Atsuo
提出了一种制备SiO2包覆Eu掺杂CaAl 2Si 2 O 8（CaAl 2Si 2 O 8：Eu）纳米晶的新工艺。在这个过程中，CaAl 2Si 2 O 8：Eu纳米晶体沉淀在富SiO2基质通过相分离和结晶。采用传统的熔融淬冷工艺制备了Eu掺杂CaO-Al_2 O_3-SiO_2系统玻璃，其组成为（x-1）SiO_2-（100-x）CaAl_2 O_4 - 1 Si mol %。对它们进行热处理以进行相分离和晶化，从而将CaAl 2Si 2 O 8：Eu晶体沉淀到相分离的玻璃中。我们成功地获得了CaAl 2Si 2 O 8：Eu晶体中的SiO2丰富的矩阵，由玻璃和α-方石英相。由于Eu ~（2+）离子的4f（7）-4f（6）5d（1）跃迁，这些玻璃和玻璃陶瓷显示出蓝色发光性质。含CaAl_2Si_2O_8：Eu微晶玻璃的蓝光发射强度与分相析晶的热处理时间密切相关。(c)2007年电化学学会。
A new process to synthesis Eu-doped CaAl2Si2O8 (CaAl2Si2O8:Eu) nanocrystals coated with SiO2 is proposed. In this process, CaAl2Si2O8:Eu nanocrystals were precipitated in a SiO2-rich matrix through phase separation and crystallization. Eu-doped CaO-Al2O3-SiO2 system glasses, with a composition of (x-1)SiO2-(100-x)CaAl2O4-1Si mol % in the immiscibility region, were prepared by a conventional melt-quenching process. They were heat-treated for phase separation and crystallization to precipitate the CaAl2Si2O8:Eu crystals into the phase separated glass. We succeeded in obtaining CaAl2Si2O8:Eu crystals in a SiO2-rich matrix, composed of glass and alpha-cristobalite phase. These glasses and glass ceramics show blue luminous properties due to the 4f(7)-4f(6)5d(1) transition of the Eu2+ ions. The blue-emission intensity of the glass ceramics containing CaAl2Si2O8:Eu significantly depended on the heat-treatment time for phase separation and crystallization. (c) 2007 The Electrochemical Society.