Improving the luminescent properties of Fe3+ in CaAl4O7 by co-doping with Bi3+ ions

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-09-04 DOI:10.1016/j.materresbull.2024.113081

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Abstract

In the framework of luminescent transition metal ions-doped phosphors for near-infrared (NIR) lighting, Fe³⁺-activated phosphors have been recently demonstrated to be a potential alternative to the most common Cr³⁺ and Ni²⁺-based NIR materials. However, this family of phosphors still suffer from low absorption efficiency and severe thermal quenching. This study investigates the effect of Bi³⁺ ion concentration on the spectroscopic features of Fe³⁺ ions in CaAl₄O₇:Fe³⁺, Bi³⁺ system. The presence of the ¹S₀→¹P₁ transition band in Fe³⁺ PLE spectra indicates the Bi³⁺→Fe³⁺ energy transfer leading to a corresponding increase in luminescence intensity of Fe³⁺ ions by over 30-fold compared to Fe³⁺-singly doped sample. High Bi³⁺ concentrations also quench Bi³⁺ ion luminescence, improving NIR emission purity. Additionally, the presence of Bi³⁺ ions enhances Fe³⁺ ion luminescence stability by delaying the thermal depopulation, as evidenced by a T₅₀ shift from 323 K to 393 K. Overall, co-doping CaAl₄O₇:Fe³⁺ with Bi³⁺ ions expands excitation spectra, boosts luminescence intensity, and enhances the thermal stability.

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通过共掺杂 Bi3+ 离子改善 CaAl4O7 中 Fe3+ 的发光特性

在用于近红外（NIR）照明的掺杂过渡金属离子的发光荧光粉框架中，Fe3+活化荧光粉最近被证明是最常见的基于 Cr3+ 和 Ni2+ 的近红外材料的潜在替代品。然而，这一系列荧光粉仍然存在吸收效率低和热淬灭严重的问题。本研究探讨了 Bi3+ 离子浓度对 CaAl4O7:Fe3+, Bi3+ 体系中 Fe3+ 离子光谱特征的影响。Fe3+ PLE 光谱中 1S0→1P1 过渡带的出现表明 Bi3+→Fe3+ 的能量转移导致 Fe3+ 离子的发光强度相应增加，与仅掺杂 Fe3+ 的样品相比增加了 30 倍以上。高浓度的 Bi3+ 还能淬灭 Bi3+ 离子的发光，提高近红外发射纯度。此外，Bi3+ 离子的存在还能延迟热析出，从而增强 Fe3+ 离子发光的稳定性，T50 从 323 K 转移到 393 K 就证明了这一点。总体而言，Bi3+ 离子与 CaAl4O7:Fe3+ 的共掺杂扩展了激发光谱，提高了发光强度，并增强了热稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.