Effect of europium doping on structural, optical and fluorescence lifetime studies of CuS nanostructures

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-03-24 DOI:10.1016/j.optmat.2025.116982

B. Sree Sesha Sudha Gayatri, N. Madhusudhana Rao

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Abstract

The purpose of the current study was to examine the impact of varying concentrations of Europium (Eu) atoms on the physical properties of copper sulphide (CuS) nanostructures designed for optical and fluorescence studies. CuS nanostructures were grown using the hydrothermal method and subsequently evaluated their structural, optical, and morphological characteristics. Nanostructures of CuS doped with Eu at levels of 0, 1, 3, 5, and 7 at. % were synthesised. For the purpose of analysing their properties, various characterisation instruments like X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), UV–Vis, photoluminescence, and FESEM were utilised. Chemical states were analysed using XPS. The XRD analysis of CuS revealed its hexagonal structure in the covellite phase and samples doped with Eu showed an increment in crystallite size. Eu-doped CuS nanostructures exhibit bandgap increment with the introduction of doping. FESEM analysis reveals the formation of flower-like structures resembling spheres, while lower magnification identifies the presence of nanoflakes. Room-temperature photoluminescence analysis was performed utilising a fluorescence spectrophotometer, revealing orange-red emission peaks at an excitation wavelength of 350 nm. The colour-correlation temperature (CCT) and colour index of extinction (CIE) values of the synthesised samples indicate significant potential for application in display technology. The analysis of fluorescence lifetime and decay in CuS nanostructures doped with Eu was validated through fluorescence lifetime measurements, indicating that the Eu dopant serves as a fluorescence-enhancing agent. Their unique luminescent properties, particularly the strong red emission, suggest potential applications in red-emitting phosphors, white LEDs, high-energy batteries, and supercapacitors.

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铕掺杂对cu纳米结构结构、光学和荧光寿命研究的影响

本研究的目的是研究不同浓度的铕（Eu）原子对设计用于光学和荧光研究的硫化铜（cu）纳米结构物理性质的影响。采用水热法制备了cu纳米结构，并对其结构、光学和形态特征进行了评价。Eu在0、1、3、5和7 at水平下掺杂cu的纳米结构。%合成。为了分析其性质，使用了各种表征仪器，如x射线衍射（XRD），拉曼，x射线光电子能谱（XPS）， UV-Vis，光致发光和FESEM。用XPS分析了化学状态。对cu的XRD分析表明其呈六方结构，且掺有Eu的样品晶粒尺寸增大。铕掺杂cu纳米结构的带隙随着掺杂的引入而增大。FESEM分析揭示了类似球体的花状结构的形成，而较低的放大倍率则确定了纳米片的存在。利用荧光分光光度计进行室温光致发光分析，在激发波长为350 nm处显示橙红色发射峰。合成样品的颜色相关温度（CCT）和颜色消光指数（CIE）值显示了在显示技术中的应用潜力。通过荧光寿命测量验证了Eu掺杂cu纳米结构的荧光寿命和衰减分析，表明Eu掺杂具有荧光增强剂的作用。它们独特的发光特性，特别是强烈的红色发射，表明了在红色发光荧光粉、白光led、高能电池和超级电容器方面的潜在应用。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.