High temperature photoluminescence dependence and energy migration of Tb3+-Incorporated K3Y(BO2)6 phosphors

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Applied Radiation and Isotopes Pub Date : 2024-09-25 DOI:10.1016/j.apradiso.2024.111529

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Abstract

This study investigates the structural and photoluminescence (PL) characteristics of Tb³⁺-incorporated K₃Y(BO₂)₆ (KYBO) phosphors synthesized via a microwave-assisted sol-gel technique. X-ray diffraction (XRD) and Rietveld refinement confirmed the formation of a pure hexagonal phase, with lattice expansion due to Tb³⁺ doping. PL studies revealed strong green emissions centered at 541 nm, attributed to the ⁵D₄ → ⁷F₅ transitions of Tb³⁺ ions, with the highest intensity observed at 5 wt% Tb³⁺. A decrease in emission was observed at higher concentrations due to concentration quenching. Temperature-dependent PL measurements revealed reverse thermal quenching enhancing PL intensity. Chromaticity analysis based on CIE 1931 coordinates showed stable green emission across all concentrations, with a maximum color purity of 89.74% observed for the KYBO:3 wt% Tb³⁺ sample. The results, along with reverse thermal quenching behavior observed between 470K and 550K, suggest that these phosphors exhibit excellent potential for lighting and display technologies.

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掺杂 Tb3+ 的 K3Y(BO2)6 荧光的高温光致发光依赖性和能量迁移

本研究探讨了通过微波辅助溶胶-凝胶技术合成的掺杂 Tb3+ 的 K3Y(BO2)6 (KYBO) 荧光粉的结构和光致发光（PL）特性。X 射线衍射 (XRD) 和里特维尔德细化证实了纯六方相的形成，掺杂 Tb³⁺ 导致晶格膨胀。聚光研究发现，以 541 nm 为中心有强烈的绿色发射，这归因于 Tb³⁺ 离子的⁵D₄ → ⁷F₅ 转变，5 wt% Tb³⁺ 时的发射强度最高。在浓度较高时，由于浓度淬火，发射率有所下降。随温度变化的聚光测量显示，反向热淬火增强了聚光强度。基于 CIE 1931 坐标的色度分析表明，在所有浓度下都有稳定的绿色发射，KYBO:3 wt% Tb³⁺ 样品的色纯度最高，达到 89.74%。这些结果以及在 470K 和 550K 之间观察到的反向热淬火行为表明，这些荧光粉在照明和显示技术方面具有卓越的潜力。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.