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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Color modulation by selective excitation activated defects and complex cation distribution in Zn1-xMgxAl2O4 nanocrystals
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Color modulation by selective excitation activated defects and complex cation distribution in Zn1-xMgxAl2O4 nanocrystals

机译:通过选择性激发活化缺陷和Zn1-XMGXAL2O4纳米晶体中复杂阳离子分布的颜色调制

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摘要

Complex cation distribution in spinet solid solution, fosters defect generation and permutates the optical properties. To scrutinize the effect on structural properties, viz. the cation distribution and defect states upon substitution of Zn with Mg; and to tune the emission properties, Zn1-xMgxAl2O4 (0.01 <= x <= 0.30) nanocrystals are synthesized. The nanocrystals show increased inversion and generation of multiple defects, namely zinc vacancies, zinc interstitials, oxygen vacancies and antisite defects with increasing Mg content, which thereby impacts the optical band gap. Pentahedral coordination in addition to tetra- and octahedral coordination of Al has been observed, which infers the presence of oxygen vacancies and dangling bonds. Moire fringes formation has intimated the presence of two or more crystal lattices with higher Mg substitution. Band-to-band and defect-assisted photoluminescence shows the role of multiple defects, especially Mg-Al' - V-O(center dot center dot) defect clusters, in deciphering the properties of the resulting crystals. Color change from bluish-white to pink has been achieved depending upon the excitation wavelength and emission mechanism, as proposed through a band model schematic. The presented study may be beneficial for designing the Zn1-xMgxAl2O4 nanocrystals with optimized emission properties.
机译:复合阳离子分布在尖丝固溶溶液中,促进缺陷产生并置换光学性质。仔细审查对结构特性,viz的影响。阳离子分布和缺陷状态在用mg替代Zn;并调谐排放性能,合成Zn1-XMGXAL2O4(0.01 <= <= 0.30)纳米晶体。纳米晶体显示出增加的反演和产生多种缺陷,即锌空位,锌间质性,氧空位和氧气空位和反烧伤缺陷,从而影响光带隙。除了观察到Al的四和八面体协调之外的偏移和八面体的协调,它是氧气空缺的存在和悬空键。 Moire Fringes的形成将存在两种或更多种晶格的存在,具有较高的Mg替换。带状带和缺陷辅助的光致发光显示了多种缺陷,特别是Mg-Al' - V-O(中心点中心点)缺陷簇的作用,在解密所得晶体的性质时。根据频带模型示意图所提出的,已经实现了从Bluish-White到粉红色的颜色改变。提出的研究可能有利于设计具有优化排放特性的Zn1-XMgxAl2O4纳米晶体。

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