Evaluation of photoluminescence and colorimetric performance of Tb3+-induced calcium tungstate ceramic

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2024-06-21 DOI:10.1140/epjb/s10051-024-00726-z

R. Paikaray, T. Badapanda, S. Sahoo, H. Mohapatra

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Abstract

Photoluminescence and colorimetric investigations of Ca_1−xTb_2x/3WO₄ with x vary from 0.01 to 0.05 samples made by employing the solid-state reaction routes are represented in this paper. Structural analyses of all the phosphors are done with the help of X-ray diffraction spectroscopy and denoted that they exhibit a tetragonal structure and I4₁/a space group without containing any secondary phase. Optical properties are described with the help of the UV–visible reflectance spectra. In addition, the energy bandgap values are evaluated from these spectra and the values are increased concerning the rise in the Tb contents in CaWO₄. Photoluminescence studies are done by considering PL excitation spectra as well as PL emission spectra. The critical concentration of quenching is observed at the composition x = 0.03 along with the critical distance of energy transfer is computed to be ~ 20 Å. Moreover, this distance is created by the dipole–dipole exchanges and indicated by the calculated Q value. Colorimetric analyses of the samples are done from the CIE color coordinates. The green emission color is obtained for all the materials. All the colorimetric parameters are evaluated and quantum yield efficiency for x = 0.03 Tb incorporated CaWO₄ material is obtained by exciting it with 485 nm wavelength. Average lifetime values are evaluated by analyzing the PL decay plots.

Graphical abstract

CIE chromaticity diagram of Tb-doped CaWO₄ at 485 nm EX wavelength

Abstract Image

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Tb3+ 引发的钨酸钙陶瓷的光致发光和比色性能评估

本文介绍了采用固态反应路线制备的 Ca1-xTb2x/3WO4 样品（x 值从 0.01 到 0.05 不等）的光致发光和比色研究。本文利用 X 射线衍射光谱对所有荧光粉进行了结构分析，结果表明这些荧光粉具有四方结构和 I41/a 空间群，不含任何次生相。紫外-可见光反射光谱描述了这些荧光粉的光学特性。此外，还通过这些光谱评估了能带隙值，随着 CaWO4 中铽元素含量的增加，能带隙值也随之增加。光致发光研究是通过考虑 PL 激发光谱和 PL 发射光谱来完成的。在成分 x = 0.03 时观察到淬火的临界浓度，同时计算出能量转移的临界距离约为 20 Å。样品的色度分析是根据 CIE 色坐标进行的。所有材料的发射色均为绿色。对所有色度参数进行评估，并用 485 纳米波长激发 x = 0.03 Tb 的 CaWO4 材料，获得其量子产率效率。通过分析聚光衰减图，评估了平均寿命值。

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