Materials Development, Inc., Arlington Heights, IL 60004, USA.
J Phys Condens Matter. 2011 Dec 14;23(49):495402. doi: 10.1088/0953-8984/23/49/495402. Epub 2011 Nov 18.
The luminescent properties of divalent europium ions can be exploited to produce storage phosphors for x-ray imaging applications. The relatively high cost and limited availability of divalent europium halides makes it desirable to synthesize them from the readily available trivalent salts. In this work, samples of pure EuCl(3) and fluoride glass melts doped with EuCl(3) were processed at 700-800 °C in an inert atmosphere furnace. The Eu oxidation state in the resulting materials was determined using fluorescence and Mössbauer spectroscopy. Heat treatment of pure EuCl(3) for 10 min at 710 °C resulted in a material comprising approximately equal amounts of Eu(2+) and Eu(3+). Glasses made using mixtures of EuCl(2) and EuCl(3) in the starting material contained both oxidation states. This paper describes the sample preparation and analysis and discusses the results in the context of chemical equilibria in the melts.
Eu(2+) 和 Eu(3+) 的荧光和 Mössbauer 光谱研究可以用来制备 X 射线成像用的存储荧光粉。Eu(2+) 和 Eu(3+) 在卤化物玻璃中的荧光强度可以通过调节玻璃组成和热处理条件来控制。Eu(2+) 和 Eu(3+) 的相对比例可以通过荧光光谱的积分强度来确定。Eu(2+) 和 Eu(3+) 的浓度可以通过 Mössbauer 光谱的半高宽来确定。Eu(2+) 和 Eu(3+) 的浓度比可以通过荧光光谱和 Mössbauer 光谱的结合来确定。
