Photoluminescence properties of manganese activated calcium tungstate phosphors

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-06-06 DOI:10.15251/djnb.2024.192.761

M. J. Rao, K. S. R. Murthy, Ch. R. S. Kumar, B. P. Singh, G. Choudary, M. C. Varma, Mn CaWO4

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Abstract

This study presents the novel Mn doped CaWO4 nanophosphors as an excellent alternatives of rare earth free materials for display application. The Mn doped CaWO4 phosphor were characterized by various techniques, such as UV–Vis-DRS, Raman, PL analysis. Scheelite type tetragonal structure with space group I41/a has been confirmed. Rietveld analyses confirms the formation of single-phase solid solution. Lattice parameters for Mn free and Mn doped samples were calculated and observed that cell volume decreases after Mn incorporation. FTIR and Raman studies confirm the involvement of functional group and vibrational modes of vibration in the compound. Band gap values are estimated to be in the range of 4.2 to 4.33 eV with Mn doping. Photoluminescence study confirms the strong green emission at 450 and 515 nm (d-d transition in Mn2+) after Mn doping. Also, it was observed that strong emission peak appears ~422 nm is mainly due to the electronic transition, 1 T2 → 1 A1 in [WO4] 2- tetrahedron of CaWO4 host matrices. CIE study confirms that prepared nanophosphor exhibits strong blue colour after Mn incorporation. It can be employed as a potential material for blue phosphors in LEDs applications.

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锰活化钨酸钙荧光粉的光致发光特性

本研究介绍了新型掺杂锰的 CaWO4 纳米荧光粉，它是一种用于显示应用的无稀土材料的极佳替代品。掺杂锰的 CaWO4 荧光粉通过紫外-可见-可见光谱、拉曼、聚光分析等多种技术进行了表征。研究证实了白钨矿型四方结构，空间群为 I41/a。里特维尔德分析证实了单相固溶体的形成。计算了无锰和掺锰样品的晶格参数，观察到掺锰后晶胞体积减小。傅立叶变换红外光谱和拉曼研究证实了化合物中官能团和振动模式的参与。掺入锰后，带隙值估计在 4.2 至 4.33 eV 之间。光致发光研究证实，掺入锰后，在 450 和 515 纳米波长处（Mn2+ 的 d-d 转变）会产生强烈的绿色发射。此外，还观察到在 ~422 nm 处出现的强发射峰主要是由于 CaWO4 主基质的 [WO4] 2- 四面体中的电子转变 1 T2 → 1 A1 所致。CIE 研究证实，制备的纳米磷在加入锰后呈现出强烈的蓝色。它可以作为一种潜在的蓝色荧光粉材料应用于 LED 中。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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