Europium-doped calcium pyrophosphates:: Allotropic forms and photo luminescent properties

被引:54
作者
Doat, A
Pellé, F
Lebugle, A
机构
[1] ENSIACET, INPT, Inst Natl Polytech Toulouse, CIRIMAT,CNRS,UMR 5085, F-31077 Toulouse, France
[2] ENSCP, CNRS, UMR 7574, Lab Chim Appliquee Etat Solide, F-75231 Paris, France
关键词
calcium pyrophosphate; Eu2+; Eu3+; luminescence;
D O I
10.1016/j.jssc.2005.05.023
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
in a search for new luminescent biological probes, we synthesized calcium pyrophosphates doped with europium up to an atomic Eu/(Eu + Ca) ratio of 2%. They were prepared by coprecipitating a mixture of calcium and europium salts with phosphate, After heating at 900 degrees C in air, two phases coexisted, identified its the beta calcium pyrophosphate form and EuPO4. Heating near 1250 degrees C ill air, during the beta - x transformation, europium ions substitute for Calcium ions ill the x. calcium pyrophosphate structure as, demonstrated by the spectroscopic study. Europium ions with both valence states (divalent and trivalent) were observed in the samples. Following the synthesis procedure, partial reduction of Eu3+ took place even in an oxidizing atmosphere, The 0.5%-doped compound could serve as a sensitive probe in biological applications. Depending oil the excitation wavelength. the luminescence occurs either in the red or in the blue regions, which discriminates it from parasitic signals arising from other dyes or organelles in live cells. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:2354 / 2362
页数:9
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