Enhancement of Sm3+ Luminescence in Sol-Gel Silica Matrix: Effect of Ligands Phenyl Phosphinic Acid and Trioctylphosphine Oxide.

IF 2.6 4区 化学 Q2 BIOCHEMICAL RESEARCH METHODS
Navaneeta Rajkonwar, Purabi Gogoi, Pankaj Dutta
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引用次数: 0

Abstract

Sol-gel silica matrices singly doped with Sm3+ and co-doped with ligands phenyl phosphinic acid (PPIA) and trioctylphosphine oxide (TOPO) were fabricated and studied for their structural and spectroscopic behaviour. Structural studies were done by x-ray diffraction (XRD) and Fourier transform infra-red (FTIR) absorption analysis whereas spectroscopic behaviour was studied by ultraviolet - visible (UV-Vis) absorption, photoluminescence (PL) excitation, emission and time-correlated decay analyses. XRD studies exhibit the amorphous nature of the samples and FTIR studies corroborate the presence of the ligands in the silica matrix. UV-Vis absorption and PL studies show significant enhancement in the radiative parameters in ligand co-doped samples compared to singly doped Sm3+ sample. Judd Ofelt parameters estimated from the absorption spectra possess higher values compared to popular hosts; revealing higher asymmetry and covalency around the active Sm3+ ions. An enhancement in PL intensity by 50.38 times and yield by 52.57 times with the co-doping of the ligands PPIA and TOPO is reported. These enhancement in the radiative output in ligand co-doped samples is attributed to the modification of the silica network with the incorporation of the ligands, energy transfer from ligands to nearby Sm3+ ions as well as due to the shielding of Sm3+ ions from the OH quenchers in the silica matrix. The improved PL behaviour especially corresponding to 4G5∕26H9∕2 transitions occurring at 643 nm suggests the potential of PPIA and TOPO co-doped Sm3+ silica matrix for diverge optical applications.

溶胶凝胶二氧化硅基质中 Sm3+ 发光的增强:配体苯基膦酸和三辛基氧化膦的影响。
制备了单掺杂 Sm3+ 和共掺杂配体苯基膦酸 (PPIA) 和三辛基氧化膦 (TOPO) 的溶胶凝胶二氧化硅基质,并对其结构和光谱特性进行了研究。结构研究是通过 X 射线衍射(XRD)和傅立叶变换红外(FTIR)吸收分析完成的,而光谱行为则是通过紫外-可见(UV-Vis)吸收、光致发光(PL)激发、发射和时间相关衰减分析进行的。XRD 研究显示了样品的无定形性质,傅立叶变换红外光谱研究证实了配体存在于二氧化硅基质中。紫外-可见吸收和聚光研究表明,与单掺杂 Sm3+ 样品相比,配体共掺杂样品的辐射参数显著提高。根据吸收光谱估算出的 Judd Ofelt 参数值比普通宿主参数值更高;这表明活性 Sm3+ 离子周围具有更高的不对称性和共价性。据报告,在配体 PPIA 和 TOPO 的共同掺杂下,PL 强度提高了 50.38 倍,产率提高了 52.57 倍。配体共掺杂样品辐射输出的增强归因于配体的加入对二氧化硅网络的改变、配体向附近 Sm3+ 离子的能量转移以及二氧化硅基体中的羟基淬灭剂对 Sm3+ 离子的屏蔽。聚光性能的改善,特别是在 643 纳米波长发生的 4G5∕2→6H9∕2 转变,表明 PPIA 和 TOPO 共掺杂 Sm3+ 硅基质在发散光学应用方面具有潜力。
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来源期刊
Journal of Fluorescence
Journal of Fluorescence 化学-分析化学
CiteScore
4.60
自引率
7.40%
发文量
203
审稿时长
5.4 months
期刊介绍: Journal of Fluorescence is an international forum for the publication of peer-reviewed original articles that advance the practice of this established spectroscopic technique. Topics covered include advances in theory/and or data analysis, studies of the photophysics of aromatic molecules, solvent, and environmental effects, development of stationary or time-resolved measurements, advances in fluorescence microscopy, imaging, photobleaching/recovery measurements, and/or phosphorescence for studies of cell biology, chemical biology and the advanced uses of fluorescence in flow cytometry/analysis, immunology, high throughput screening/drug discovery, DNA sequencing/arrays, genomics and proteomics. Typical applications might include studies of macromolecular dynamics and conformation, intracellular chemistry, and gene expression. The journal also publishes papers that describe the synthesis and characterization of new fluorophores, particularly those displaying unique sensitivities and/or optical properties. In addition to original articles, the Journal also publishes reviews, rapid communications, short communications, letters to the editor, topical news articles, and technical and design notes.
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