Structure and Optical Spectroscopy of Eu-Doped Glass Ceramics Containing GdF3 Nanocrystals
Structure and Optical Spectroscopy of Eu-Doped Glass Ceramics Containing GdF3 Nanocrystals
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含GdF3纳米晶的Eu掺杂微晶玻璃的结构与光谱
DOI：
10.1021/jp808061x
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发表时间：
2008-12-04
影响因子：
3.7
通讯作者：
Huang, Ping
中科院分区：
文献类型：
--
作者：
Chen, Daqin;Wang, Yuansheng;Huang, Ping
以44 SiO（2）-28Al（2）O（3）-17NaF-11GdF（3）玻璃为原料，采用熔融淬冷法制备了含六方GdF 3纳米晶的透明微晶玻璃。在熔体淬火过程中析出了平均尺寸为6 nm的GdF 3纳米晶。提高淬火样品的加热温度导致GdF 3颗粒的进一步沉淀和生长。在398 nm激发下的室温光致发光谱表明，该玻璃陶瓷除了具有Eu 3+离子的特征发射峰外，还出现了一个强烈的宽的蓝色发射带，这是由于Eu 3+离子的5d -> 4f跃迁引起的。发光的明显Stark分裂、低的受迫电偶极D-5（0）-> F-7（2）跃迁和Eu 3+的长衰减寿命证明了Eu 3+离子分配到GdF 3纳米晶体中，而发现Eu 2+离子驻留在玻璃基质中。激发光谱和发射光谱表明，Gd ~（3+）的激发能转移到Eu ~（3+）和Eu ~（3+）上。
Transparent glass ceramics containing hexagonal GdF3 nanocrystals were fabricated by melt-quenching and subsequent heating of glass with composition of 44SiO(2)-28Al(2)O(3)-17NaF-11GdF(3). The GdF3 nanocrystals with mean size of 6 nm were precipitated during quenching of the melt. Increasing the heating temperature of the quenched sample resulted in the further precipitation and growth of the GdF3 particles. The room temperature photoluminescence spectra of the glass ceramic excited at 398 nm show that, in addition to the characteristic sharp emissions of Eu3+ ions, an intense wide blue emission band ascribing to the Eu3+ 5d -> 4f transition also appeared. The obvious Stark splitting of the emissions, the low forced electric dipole D-5(0) -> F-7(2) transition, and the long decay lifetimes of Eu3+ evidenced the partition of Eu3+ ions into the GdF3 nanocrystals, while Eu2+ ions were found to reside in the glass matrix. The excitation and emission spectra demonstrated that the excitation energy of Gd3+ was transferred to both Eul+ and Eu3+.