Exploration of dual-functional Tb3+ activated potassium calcium bismuth phosphate phosphor: Insights into optical transitions and photoluminescence characteristics for lighting and temperature sensing applications

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-09-13 DOI:10.1016/j.jlumin.2025.121526

E. Muthulakshmi, Kavia J. Albert, S. Masilla Moses Kennedy

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引用次数: 0

Abstract

A green-emitting Tb³⁺-doped KCaBi(PO₄)₂ phosphor was synthesized via a conventional solid-state reaction method. Phase purity and crystallographic structure were confirmed by powder X-ray diffraction (PXRD) and Rietveld refinement, revealing a hexagonal crystal structure. Field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to analyze the morphology and elemental composition of the phosphor, respectively. Under 371 nm excitation, the phosphor exhibits a strong green emission centered at 544 nm, corresponding to the ⁵D₄ → ⁷F₅ transition of Tb³⁺ ions. Diffuse reflectance spectroscopy revealed optical bandgap energies of 3.84 eV for the undoped and 4.30 eV for the 0.08 mol Tb³⁺-doped samples. The optimized composition (8 mol % Tb³⁺) retained 55 % of its room-temperature luminescence intensity at 423 K, indicating a moderate thermal stability. Temperature-dependent photoluminescence measurements yielded a relative sensitivity of 1.5 % K⁻¹, while the lifetime-based analysis resulted in a sensitivity of 0.34 % K⁻¹. Photometric parameters, including Commission Internationale de IˈÉclairage (CIE) chromaticity coordinates, color purity, and correlated color temperature (CCT), were evaluated from the emission spectra. These findings suggest that Tb³⁺-doped KCaBi(PO₄)₂ is a promising green-emitting phosphor for solid-state lighting and temperature sensing applications.

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双功能Tb3+活化磷酸钾钙铋荧光粉的探索：对照明和温度传感应用的光学跃迁和光致发光特性的见解

采用传统的固相反应法制备了一种绿色Tb3+掺杂KCaBi(PO4)2荧光粉。通过粉末x射线衍射（PXRD）和Rietveld细化证实了相纯度和晶体结构，显示出六方晶体结构。利用场发射扫描电镜（FESEM）和能量色散x射线能谱（EDS）分别分析了荧光粉的形貌和元素组成。在371 nm激发下，荧光粉表现出以544 nm为中心的强绿色发射，与Tb3+离子的5D4→7F5跃迁相对应。漫反射光谱显示，未掺杂样品的带隙能量为3.84 eV， 0.08 mol Tb3+掺杂样品的带隙能量为4.30 eV。优化后的组合物（8mol % Tb3+）在423 K时保持了55%的室温发光强度，显示出中等的热稳定性。温度依赖的光致发光测量结果的相对灵敏度为1.5% K−1，而基于寿命的分析结果的灵敏度为0.34% K−1。光度参数包括国际委员会Éclairage （CIE）色度坐标、颜色纯度和相关色温（CCT），从发射光谱中进行评估。这些发现表明，Tb3+掺杂的KCaBi(PO4)2是一种很有前途的固态照明和温度传感绿色发光荧光粉。

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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.