Abstract

This paper represents structure, photoluminescence, and colorimetric investigations of Sm-activated CaWO₄ ceramic made with the help of a solid-state reaction process. Structures of the ceramics are examined through X-ray diffraction spectroscopy. It indicates that these materials have a tetragonal structure and I4₁/a space group without having any other secondary phase. Energy band gaps are increased with the higher concentrations of Sm dopants. Photoluminescence analyses show that concentration quenching is found at x = 0.02 Sm incorporated CaWO₄. The critical distance of energy transfer is obtained as about 20 Å. Q-value is observed approximately equal to 6 which denotes that dipole-dipole interactions occur in the materials that create the critical energy transfer distance in them. Chromaticity values are described in that the ceramics emit orange-red color as well as excellent colorimetric parameters. Quantum efficiency of x = 0.02 Sm composition in CaWO₄ is measured under 405 nm EX wavelength. Photoluminescence decay behaviors are observed and average lifetime values are evaluated.

中文翻译：

---

Sm 激活 CaWO4 陶瓷的光致发光、比色和衰减性能探索

摘要

本文介绍了借助固态反应过程制备的Sm 激活 CaWO ₄陶瓷的结构、光致发光和比色研究。通过 X 射线衍射光谱检查陶瓷的结构。这表明这些材料具有四方结构和I4 ₁ /a空间群，不具有任何其他第二相。能带隙随着 Sm 掺杂剂浓度的增加而增加。光致发光分析表明，在x = 0.02 Sm 掺入CaWO ₄时发现浓度猝灭。能量传递的临界距离约为 20 Å。观察到的 Q 值大约等于 6，这表示材料中发生偶极-偶极相互作用，从而在其中产生临界能量转移距离。色度值描述为陶瓷发出橙红色以及优异的比色参数。 CaWO ₄中x=0.02 Sm成分的量子效率是在405 nm EX波长下测量的。观察光致发光衰减行为并评估平均寿命值。