Kaynar U H, Aydin H, Hakami Jabir, Altowyan Abeer S, Coban M B, Ayvacikli M, Canimoglu A, Can N
Bakırcay University, Faculty of Engineering and Architecture, Department of Fundamental Sciences, Menemen, Izmir, Turkiye; Bakırçay University, Biomedical Technologies Design Application and Research Center, Menemen, Izmir, Turkiye.
Central Research Laboratories, Katip Celebi University, Izmir, Turkiye; Graphene Application&Research Center, Izmir, Turkiye.
Appl Radiat Isot. 2024 Aug;210:111380. doi: 10.1016/j.apradiso.2024.111380. Epub 2024 May 31.
This study explores the structural and luminescent properties of terbium (Tb³⁺)-doped lanthanum aluminium borate (LaAl₂B₄O₁₀, abbreviated as LAB) phosphors, a novel host lattice for Tb³⁺ doping. LAB:Tb³⁺ phosphors, with varying dopant concentrations, were synthesized using a microwave-assisted combustion synthesis approach and characterized using X-ray diffraction (XRD), Rietveld refinement, and photoluminescence spectroscopy at both room and low temperatures. The structural analysis confirmed the hexagonal crystal structure of LAB and revealed successful incorporation of Tb³⁺ ions without altering the fundamental lattice. Luminescence studies demonstrated that the LAB:Tb³⁺ phosphors show strong green emission primarily attributed to the D→F transition of Tb³⁺. The optimal doping concentration was determined to be 5 wt% Tb³⁺, which provided maximum luminescence efficiency. This concentration also allowed for a critical study of energy transfer mechanisms within the phosphor, revealing dipole-dipole interactions with a critical distance of 9.80 Å between Tb³⁺ ions. Additionally, the CIE chromaticity coordinates of LAB:0.05 Tb³⁺ were precisely determined to be (0.289, 0.4460), indicating the potential for high-quality green emission suitable for solid-state lighting and display technologies. This work not only demonstrates the potential of LAB:Tb as a highly efficient green luminescent material, but also sheds light on the mechanisms responsible for energy transfer and concentration quenching.
本研究探索了掺铽（Tb³⁺）的硼酸镧铝（LaAl₂B₄O₁₀，缩写为LAB）荧光粉的结构和发光特性，LAB是一种用于Tb³⁺掺杂的新型基质晶格。采用微波辅助燃烧合成法合成了不同掺杂浓度的LAB:Tb³⁺荧光粉，并在室温和低温下利用X射线衍射（XRD）、Rietveld精修和光致发光光谱对其进行了表征。结构分析证实了LAB的六方晶体结构，并揭示了Tb³⁺离子成功掺入且未改变基本晶格。发光研究表明，LAB:Tb³⁺荧光粉呈现出强烈的绿色发射，主要归因于Tb³⁺的D→F跃迁。确定最佳掺杂浓度为5 wt% Tb³⁺，此时发光效率最高。该浓度还使得能够对荧光粉内的能量转移机制进行关键研究，揭示了Tb³⁺离子之间临界距离为9.80 Å的偶极-偶极相互作用。此外，LAB:0.05 Tb³⁺的CIE色度坐标精确测定为(0.289, 0.4460)，表明其具有适用于固态照明和显示技术的高质量绿色发射潜力。这项工作不仅证明了LAB:Tb作为高效绿色发光材料具有潜力，还阐明了能量转移和浓度猝灭的相关机制。
