Nano-environment effects on the luminescence properties of Eu3+-doped nanocrystalline SnO2 thin films
Nano-environment effects on the luminescence properties of Eu3+-doped nanocrystalline SnO2 thin films
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DOI：
10.1063/1.4765099
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发表时间：
2012-11-14
影响因子：
4.4
通讯作者：
Leung, K. T.
中科院分区：
文献类型：
--
作者：
Bazargan, Samad;Leung, K. T.
采用简单的旋涂法制备了掺Eu ~（3+）的氧化锡纳米薄膜，并在700 ℃的氧气流中进行退火处理。透射电子显微镜和X射线光电子能谱的研究表明，掺入的Eu 3+离子在薄膜中的高原子百分比为2.7%-7.7%，这被发现是线性依赖于在前体溶液中的Eu 3+的初始浓度。X射线衍射结果表明，随着Eu ~（3+）浓度的增加和退火温度的降低，晶粒尺寸减小，当Eu ~（3+）浓度>= 5.3at.%时，出现Eu_2Sn_2O_7相。这些掺杂样品的发光光谱显示的特征窄带磁偶极发射在593 nm和电偶极发射在614 nm的Eu 3+离子，所产生的紫外吸收在SnO 2的带边，然后通过能量转移到发射中心。操纵样品的微晶尺寸、组成和缺陷密度极大地影响吸收边、能量转移，并因此影响发射光谱。Eu 3+离子环境中的这些改变允许将发射从纯橙子特征Eu 3+发射调谐到对应于强特征Eu 3+发射与强缺陷发射的组合的宽带发射。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4765099]
Nanocrystalline tin (IV) oxide thin films doped with Eu3+ ions are synthesized using a simple spin-coating method followed by postannealing in an O-2 flow at 700 degrees C. Transmission electron microscopy and x-ray photoelectron spectroscopy studies illustrate the incorporation of Eu3+ ions in the films with a high atomic percentage of 2.7%-7.7%, which is found to be linearly dependent on the initial concentration of Eu3+ in the precursor solution. Glancing incidence x-ray diffraction results show that the crystalline grain sizes decrease with increasing the Eu3+ concentration and decreasing the postannealing temperature with the emergence of the Eu2Sn2O7 phase at high Eu3+ concentrations (>= 5.3 at.%). Luminescence spectra of these doped samples show the characteristic narrow-band magnetic dipole emission at 593 nm and electric dipole emission at 614 nm of the Eu3+ ions, arising from UV absorption at the SnO2 band-edge followed by energy transfer to the emission centers. Manipulating the crystallite size, composition, and defect density of the samples greatly affects the absorption edge, energy transfer, and therefore the emission spectra. These modifications in the environment of the Eu3+ ions allow the emission to be tuned from pure orange characteristic Eu3+ emission to the broadband emission corresponding to the combination of strong characteristic Eu3+ emission with the intense defect emissions. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765099]