Cerium-infused tungstate nanocrystals: Illuminating the future of solid-state lighting

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-10-22 DOI:10.1016/j.molstruc.2024.140463

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Abstract

Rare earth based luminescent materials have emerged as a focal point of the scientific investigation owing to their remarkable optical behaviour and potential applications. An effort has been made to develop a series of Ce³⁺ doped CaWO₄ nano-phosphors using an ethylene-glycol assisted reflux route. The detailed structural and morphological properties have been examined through various analytical techniques. The +3-oxidation state of the activator ion Ce has been verified through the XPS study. The change in optical band gap due to the substitution is well discussed using diffuse reflectance spectroscopy. In Photoluminescence study, a broad emission centred at 465 nm is observed due to the ⁵D_3/2→²F_J transitions (J = 7/2 and 5/2) and a significant enhancement in the emission peak is obtained for the optimized phosphor. Concentration quenching phenomenon, observed after 3 mol% of Ce³⁺ is mainly mediated by the electric multipole-multipole type interaction. The CIE diagram indicates the tuning of emission colour from blue to white region and the emission near white region for the optimized phosphor is further authenticated by its low colour purity value (43 %). The effective tunability of photo-physical properties and colorimetric parameters suggest the applicability of the optimized nano-phosphor in solid state lighting especially for outdoor illumination.

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注入铈的钨酸盐纳米晶体：照亮固态照明的未来

基于稀土的发光材料因其卓越的光学性能和潜在的应用而成为科学研究的焦点。我们采用乙烯-乙二醇辅助回流路线，努力开发了一系列掺杂 Ce3+ 的 CaWO4 纳米磷酸盐。通过各种分析技术对其详细的结构和形态特性进行了研究。活化剂离子 Ce 的 +3- 氧化态已通过 XPS 研究得到验证。利用漫反射光谱分析了替代物导致的光带隙变化。在光致发光研究中，由于 5D3/2→2FJ 转变（J = 7/2 和 5/2），观察到以 465 纳米为中心的宽发射，优化荧光粉的发射峰显著增强。在 Ce3+ 浓度为 3 mol% 之后观察到的浓度淬灭现象主要是由电多极-多极型相互作用介导的。CIE 图显示了从蓝色到白色区域的发射色调，而优化荧光粉的低色纯度值（43%）进一步证实了其在白色区域附近的发射。光物理性质和色度参数的有效可调性表明，优化的纳米荧光粉可用于固态照明，尤其是户外照明。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.