Spectroscopic properties of Co2+: ZnAl2O4 nanocrystals in sol-gel derived glass-ceramics

被引：48

作者：

Duan, XL ^{[1
]}

Yuan, DR ^{[1
]}

Cheng, XF ^{[1
]}

Sun, ZH ^{[1
]}

Sun, HQ ^{[1
]}

Xu, D ^{[1
]}

Lv, MK ^{[1
]}

机构：

[1] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2003年 / 64卷 / 06期

基金：

中国国家自然科学基金;

关键词：

nanostructures; sol-gel growth; X-ray diffraction; optical properties;

D O I：

10.1016/S0022-3697(02)00478-X

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Transparent glass-ceramics containing zinc-aluminum spinel (ZnAl2O4) nanocrystals doped with tetrahedrally coordinated Co2+ ions were obtained by the sol-gel method for the first time. The gels of composition SiO2-Al2O3-ZnO-CoO were prepared at room temperature and heat-treated at temperature ranging 800-950degreesC. When the gel samples were heated up to 900degreesC, ZnAl2O4 nanocrystals were precipitated. Co2+ ions were located in tetrahedral sites in ZnAl2O4 nanocrystals. X-ray diffraction analysis shows that the crystallite sizes of ZnA1204 Crystal become large with the heat-treatment temperature and time, and the crystallite diameter is in the range of 10-15 nm. The dependence of the absorption and emission spectra of the samples on heat-treatment temperature were presented. The difference in the luminescence between Co2+ doped glass-ceramic and Co2+ doped bulk crystal was analysed. The crystal field parameter D-q of 423 cm(-1) and the Racah parameters B of 773 cm(-1) and C of 3478.5 cm(-1) were calculated for tetrahedral Co2+ ions. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：1021 / 1025

页数：5

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