Spectroscopic analysis of La2(WO4)3:Tb3+ phosphor and the delayed concentration quenching of 5D4 →7FJ emission

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-09-11 DOI:10.1016/j.jlumin.2024.120895

Bibily Baby, Sajan Thomas, Jifi Jose, Manju Gopinath, P.R. Biju, Cyriac Joseph

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引用次数: 0

Abstract

Trivalent terbium ion doped lanthanum tungstate (La_2-xTb_x(WO₄)₃; x = 0.6,1.0,1.4) and terbium tungstate (Tb₂(WO₄)₃) phosphors were successfully synthesized via optimized microwave-assisted co-precipitation technique. The phase purity and crystallinity of the prepared samples were confirmed using the powder XRD technique. The photoluminescence studies revealed a quenching-free emission up to 70 % of Tb³⁺ doping concentration, even though the emission intensity slightly decreases under host excitation since it becomes less relevant at higher doping concentrations. The experimental and calculated oscillator strengths were evaluated using absorption data and further used to quantify the Judd - Ofelt (JO) intensity parameters, which appeared in a trend of Ω₂>Ω₄>Ω₆ for all samples. As a theoretical approach to assure the excellency of the tungstate host, the radiative parameters were calculated from the emission data using the JO analysis technique. The dominance in the values of stimulated emission cross section and gain bandwidth corresponding to ⁵D₄→⁷F₅ transition of Tb³⁺ ion of lanthanum tungstate proclaims it as an excellent green phosphor. Hence, the less susceptibility of the tungstate host towards concentration quenching is confirmed in the present work.

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La2(WO4)3:Tb3+ 荧光粉的光谱分析和 5D4 →7FJ 发射的延迟浓度淬灭

通过优化的微波辅助共沉淀技术，成功合成了掺杂三价铽离子的钨酸镧（La2-xTbx(WO4)3；x = 0.6,1.0,1.4）和钨酸铽（Tb2(WO4)3）荧光粉。利用粉末 XRD 技术确认了所制备样品的相纯度和结晶度。光致发光研究表明，Tb3+掺杂浓度达到 70% 时，尽管在宿主激发下发射强度会略有下降，但由于掺杂浓度越高，相关性越小，因此发射无淬灭。利用吸收数据对实验和计算的振子强度进行了评估，并进一步用于量化 Judd - Ofelt (JO) 强度参数，所有样品都呈现出 Ω2>Ω4>Ω6 的趋势。为了从理论上确保钨酸盐宿主的优越性，利用 JO 分析技术从发射数据中计算了辐射参数。钨酸镧离子 Tb3+ 的 5D4→7F5 转变所对应的受激发射截面和增益带宽值占主导地位，这表明它是一种优秀的绿色荧光粉。因此，本研究证实了钨酸盐宿主对浓度淬火的敏感性较低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.