Structural characterization and spectroscopic analysis of NIR emitting LiBi(MoO4)2:Ln3+(Ln= Nd, Yb and Er) phosphors for optical applications

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-06-10 DOI:10.1016/j.molstruc.2025.142965

Supriya Kshetrapal , Nilesh S. Ugemuge , P.K. Tawalare , Renuka Nafdey , S.V. Moharil

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引用次数: 0

Abstract

Results on luminescence in near infrared (NIR) region of the lanthanide ions as an activator in LiBi(MoO₄)₂ host synthesized by solid state reaction are presented. The samples were characterized using x-ray diffraction, electron microscopy, energy dispersive spectra, elemental mapping, Raman, FTIR and luminescence spectroscopy. Symmetric and asymmetric stretching vibrations of (MoO₄²⁻), were identified through combined Raman and FTIR studies. LiBi(MoO₄)₂ crystalises in non-centrosymmetric space group (I-4). Nd³⁺, Yb³⁺ and Er³⁺ were used as activators. They yielded emission lines at 1066, 1005 and 1541 nm, respectively. Yb³⁺ emission was observed only upon sensitization by Nd³⁺. Lifetime measurements were used for calculating the energy transfer efficiency which was about 83.5 %. Bandgap of LiBi(MoO₄)₂ was calculated as 3.32 eV from Tauc’s plot. This phosphor has potential applications related to NIR.

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光学用近红外发光LiBi(MoO4)2:Ln3+（Ln= Nd， Yb和Er）荧光粉的结构表征和光谱分析

研究了镧系离子作为活化剂在固相合成LiBi(MoO4)2基质中的近红外发光特性。采用x射线衍射、电子显微镜、能量色散光谱、元素图、拉曼光谱、红外光谱和发光光谱对样品进行了表征。（MoO42−）的对称和非对称拉伸振动通过拉曼和FTIR研究进行了识别。LiBi(MoO4)2在非中心对称空间群（I-4）中结晶。用Nd3+、Yb3+和Er3+作为活化剂。它们分别在1066、1005和1541 nm处产生了发射线。仅在Nd3+敏化后才观察到Yb3+的发射。用寿命测量法计算了能量传递效率，约为83.5%。根据Tauc图计算LiBi(MoO4)2的带隙为3.32 eV。该荧光粉具有与近红外相关的潜在应用。

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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.