Spectroscopic Properties of Lu2O3/Eu3+ Nanocrystalline Powders and Sintered Ceramics
Spectroscopic Properties of Lu2O3/Eu3+ Nanocrystalline Powders and Sintered Ceramics
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DOI：
10.1021/jp012468
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发表时间：
2002-03
影响因子：
3.3
通讯作者：
E. Zych;D. Hreniak;W. Stręk
中科院分区：
文献类型：
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作者：
E. Zych;D. Hreniak;W. Stręk
采用燃烧法制备了Eu掺杂浓度为1−~(13)m/0的纳米级Eu_2O_3粉末。用透射电子显微镜测定了它们的形貌。结果表明，纳米晶的尺寸约为10−13 nm。这些粉末在1700°C下烧结成颗粒宽达几微米的片剂。测量了所有材料的吸收光谱和发射光谱。在纳米颗粒的情况下，观察到随着浓度的增加，紫外吸收带发生了显著的变化。纳米粉末的Eu发射寿命显示出显著的浓度猝灭。在Eu含量为13m/0以下的烧结材料中没有观察到这种影响。在室温下，两种材料的发射上升时间都随着Eu浓度的增加而显著降低。在液氮温度下，当Eu含量为5%时，纳米材料(∼110μS)的上升时间最长，而烧结陶瓷的上升时间最长。
Europium-doped Lu2O3 nanocrystalline powders with Eu concentrations of 1−13 m/0 were prepared via a combustion route. Their morphology was determined with TEM measurements. It was found that the sizes of nanocrystallites were around 10−13 nm. These powders were sintered at 1700 °C into tablets whose grains were a few micrometers wide. Absorption and emission spectra of all materials were measured. Pronounced changes of UV absorption bands with increasing concentration were observed in the case of nanoparticulate powders. The Eu emission lifetimes of nanopowders demonstrated significant concentration quenching. No such effect was observed for the sintered materials up to 13 m/0 of Eu. A strong decrease of the emission rise time with rising Eu concentration was found for both types of the material at room temperature. At the temperature of liquid nitrogen, the longest rise time in the case of nanomaterials (∼110 μs) was found for a sample containing 5% of Eu, whereas for the sintered ceramics, the behavior ...