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Site spectroscopy of Eu3+ doped- ZnS nanocrystals embedded in sodium carboxymethyl cellulose matrix

机译:嵌入羧甲基纤维素钠基质中的Eu3 +掺杂的ZnS纳米晶体的位光谱

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The work investigates the incorporation of Eu3+ ion in ZnS crystal through spectroscopic studies. ZnS: Eu3+ nanocrystals was synthesized via the precipitation technique. Elemental composition analysis indicates a non-stoichiometric distribution between Zn and S. X-ray diffraction studies show lattice expansion demonstrating that Eu3+ ions were incorporated in the host lattice. Annealing temperature gave rise to lattice contraction relative to the as-synthesized indicating a partial expulsion of the ion from the crystal due to heat treatment. Eu3+ ions site symmetry probing from optical features show that trivalent europium were situated both at the nanocrystals surface and at the Zn2+ ion site. Weak energy transfer from host to activator ion occurred probably mainly through exchange interaction and the transfer process was defect mediated. (C) 2016 Elsevier B.V. All rights reserved.
机译:通过光谱研究,研究了Eu3 +离子在ZnS晶体中的掺入。通过沉淀技术合成了ZnS:Eu3 +纳米晶体。元素组成分析表明Zn和S之间存在非化学计量分布。X射线衍射研究显示晶格膨胀,表明Eu3 +离子掺入了主晶格。退火温度引起相对于合成时的晶格收缩,这表明由于热处理,离子从晶体中部分排出。从光学特征探究的Eu3 +离子位点对称性表明,三价euro既位于纳米晶体表面,又位于Zn2 +离子位点。从主体到活化剂离子的弱能量转移可能主要通过交换相互作用发生,并且转移过程是由缺陷介导的。 (C)2016 Elsevier B.V.保留所有权利。

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