Synthesis of Eu-doped SrAl2O4 nanophosphors by CO2 laser vaporization
Synthesis of Eu-doped SrAl2O4 nanophosphors by CO2 laser vaporization
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DOI：
10.1016/j.actamat.2013.08.010
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发表时间：
2013-11
期刊：
影响因子：
9.4
通讯作者：
C. Zollfrank;S. Gruber;M. Batentschuk;A. Osvet;F. Goetz-Neunhoeffer;S. Dittrich;J. Grabow;Heinz-Dieter Kurland;F. Müller
中科院分区：
文献类型：
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作者：
C. Zollfrank;S. Gruber;M. Batentschuk;A. Osvet;F. Goetz-Neunhoeffer;S. Dittrich;J. Grabow;Heinz-Dieter Kurland;F. Müller
提出了一种利用CO2激光共蒸发技术（CoLAVA）合成具有光致发光尖晶石结构的球形纳米粒子的新方法。该方法应用氧化物前体如Al 2 O3、SrO和Eu 2 O3的均匀混合物，并允许制造超过10 g h-1的量。在CoLAVA过程中，离析物氧化物通过气相冷凝反应，产生直径为10至100 nm的无定形球形颗粒。所制备的材料表现出红色发射在625 nm（1.98 eV），由于纳入Eu 3+。在还原气氛下高达1200 °C的温度处理产生相同尺寸的结晶颗粒，其轻微烧结。这些颗粒由>90重量%的SrAl 2 O 4与少量Sr 3Al 2 O 6和SrCO 3。随着温度的升高，SrAl 2 O 4尖晶石相的数量增加，而伴随相的数量减少。在900 °C的起始温度下观察到在室温下检测到的以525 nm（2.36 eV）为中心的强绿色发射，这是由于SrAl 2 O 4的晶格中存在Eu 2+。在较高的退火温度下没有观察到红色发射。CoLAVA方法代表了一种快速简便的路线，用于制造各种工程应用的纳米到微米结构的磷光体材料。
A new method of synthesizing spherical nanoparticles with photoluminescent spinel structures using a CO2laser co-vaporization technique (CoLAVA) is presented. The method applies homogeneous mixtures of oxidic precursors such as Al2O3, SrO and Eu2O3and allows the fabrication of quantities exceeding 10 g h−1. During the CoLAVA process, the educt oxides are reacted by a gas phase condensation yielding amorphous spherical particles with diameters ranging from 10 to 100 nm. The as-prepared materials exhibit red emission at 625 nm (1.98 eV) due to the incorporated Eu3+. Temperature treatment up to 1200 °C under a reducing atmosphere yielded crystalline particles of the same size, which were slightly sintered. These particles consisted of >90 wt.% SrAl2O4with minor fractions of Sr3Al2O6and SrCO3. The amount of the SrAl2O4spinel increased with increasing temperature, whereas the accompanying phases were decreased. A strong green emission centered at 525 nm (2.36 eV) detected at RT was observed at an onset temperature of 900 °C, which is due to the presence of Eu2+in the crystal lattice of SrAl2O4. The red emission was not observed at higher annealing temperatures. The CoLAVA method represents a fast and facile route for the fabrication of nano- to microstructured phosphor materials for a variety of engineering applications.