Defect-engineered white-light emission in Zn-substituted Ni1-xZnxFe2O4–rGO hybrid spinels

Results in Surfaces and Interfaces Pub Date : 2025-06-19 DOI:10.1016/j.rsurfi.2025.100586

T. Jose Antony, K. Jagannathan

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引用次数: 0

Abstract

The Zn-substituted Nickel Ferrite-rGO (NiFe₂O₄–rGO) nanocomposites were prepared to investigate its intrinsic defect-mediated optical emission tuning without external dopants. Formation of spinel structure with lattice distortions due to cation redistribution was confirmed by P-XRD. Uniform nanoscale distribution on rGO sheets was ascertained by HRSEM. The UV–Vis diffuse reflectance analysis revealed non-linear bandgap modification with Zn content, consistent with strain-induced electronic structure modification. The PL spectra revealed broad visible emissions dominated by intrinsic defects, with Zn substitution systematically modifying intensity and recombination dynamics. The CIE chromaticity plots revealed near-white emission, particularly for intermediate Zn content. This research illustrates that precise Zn²⁺ substitution itself allows for structural and photoluminescent behavior control, with a defect-engineered pathway to white-light emission. Ni_1-xZn_xFe₂O₄–rGO is a cost-effective, tunable optoelectronic material system.

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锌取代Ni1-xZnxFe2O4-rGO杂化尖晶石的缺陷工程白光发射

制备了锌取代铁酸镍-还原氧化石墨烯（nife2o4 -还原氧化石墨烯）纳米复合材料，研究了其在无外源掺杂情况下的本质缺陷介导的光发射调谐。P-XRD证实了阳离子重分布导致尖晶石结构的晶格畸变。利用HRSEM确定了氧化石墨烯薄片的纳米尺度均匀分布。紫外-可见漫反射分析显示带隙随Zn含量的变化呈非线性变化，与应变诱导的电子结构变化一致。PL光谱显示了以本征缺陷为主的宽可见发射，锌取代系统地改变了强度和复合动力学。CIE色度图显示近白色发光，特别是对于中等锌含量。该研究表明，精确的Zn2+取代本身允许结构和光致发光行为控制，具有缺陷工程的白光发射途径。Ni1-xZnxFe2O4-rGO是一种具有成本效益的可调谐光电材料系统。

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来源期刊

Results in Surfaces and Interfaces

CiteScore

2.70

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0.00%

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