Thermoanalysis and Emission Properties of Eu3+/Eu2+ in Eu3+-Doped Xerogels
Thermoanalysis and Emission Properties of Eu3+/Eu2+ in Eu3+-Doped Xerogels
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DOI：
10.1021/jp991873m
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发表时间：
2000
影响因子：
3.3
通讯作者：
M. Zaitoun;D. M. Goken;L. Bailey;A. T. Kim;C. T. Lin
中科院分区：
文献类型：
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作者：
M. Zaitoun;D. M. Goken;L. Bailey;A. T. Kim;C. T. Lin
在不同的条件下制备了一系列Eu 3+掺杂的硅溶胶-凝胶：（1）溶胶的pH值控制在3.0、5.5和7.5;（2）掺杂剂的抗衡离子选自铕（III）化合物的乙酸根、氯化物和硝酸根;（3）用乙二胺四乙酸（EDTA）和乙二胺三乙酸（HEDTA）两种螯合剂络合铕（III）掺杂剂;（4）采用氘代溶剂（D2 O和C2 D5 OD）在极干燥的N2环境下合成含低O-H官能度的溶胶-凝胶基质;（5）采用1%的铝或锑醇盐和99%的硅醇盐的混合物作为前驱体。检查这些差异对凝胶基质的网络结构的条件，以确定在SiO2网络中产生结构缺陷，产生电子空穴中心并利用它们在溶胶-凝胶过程中将Eu 3+还原为Eu 2+的最佳条件。两种差分扫描
A series of Eu3+-doped silica sol−gels are prepared under various conditions: (1) pH values of the sols are controlled at 3.0, 5.5, and 7.5; (2) the counterions of dopants are selected from acetate, chloride, and nitrate of europium (III) compounds; (3) two chelating agents, namely ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetriacetic (HEDTA) are used for complexing the europium (III) dopants; (4) a sol−gel matrix containing low O−H functionality is synthesized by using deuterated solvents (D2O and C2D5OD) and under an extremely dry N2 environment; and (5) a mixture of 1% of aluminum or antimony alkoxide and 99% of silicon alkoxide is adopted as precursors. The conditions that these differences have on the network structures of a gel matrix are examined in order to determine the optimal conditions for the creation of structural defects in an SiO2 network, generation of electron−hole centers and utilization of them to reduce Eu3+ to Eu2+ during the sol−gel processing. Both differential scann...