Crystal structure controlled energy transfer to Tb3+ in KTb(MoO4)2 and K5Tb(MoO4)4 crystals

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

Materials Research Bulletin Pub Date : 2025-05-12 DOI:10.1016/j.materresbull.2025.113553

Muhammad Usama Jamal , Vitali Nagirnyi , Kirill Chernenko , Aleksei Kotlov , Yevheniia Smortsova , Dmitry Spassky

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引用次数: 0

Abstract

Luminescent properties of KTb(MoO₄)₂ and K₅Tb(MoO₄)₄ crystals, possessing the same elemental composition but different crystal structures, were studied. The structural arrangement of Tb³⁺ ions, ordered in KTb(MoO₄)₂ and disordered in K₅Tb(MoO₄)₄, determines their luminescence properties. Partial lattice disorder of K₅Tb(MoO₄)₄ results in broadened bands of Tb³⁺ emission and excitation spectra, but also in more efficient energy transfer from electron-hole excitations to Tb³⁺ due to the disorder-induced limitation of charge carriers’ mean path. It is shown that interband excitation of the Tb^{3+ 5}D₄ terms responsible for the green emission is realized via the intermediate stage of self-trapped exciton creation, while that of the ⁵D₃ terms responsible for the blue emission is realized through the impact interaction. Crystal structure determining the position of Tb³⁺ states in the electronic energy band structure and the distance between neighboring Tb³⁺ sites was found to strongly influence thermal stability and decay characteristics of the Tb³⁺ emission.

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在KTb(MoO4)2和K5Tb(MoO4)4晶体中，晶体结构控制着能量向Tb3+的转移

研究了元素组成相同但晶体结构不同的KTb(MoO4)2和K5Tb(MoO4)4晶体的发光特性。Tb3+离子在KTb(MoO4)2中有序，在K5Tb(MoO4)4中无序的结构排列决定了它们的发光性质。K5Tb(MoO4)4的部分晶格无序导致Tb3+发射和激发光谱的波段变宽，但由于无序导致的载流子平均路径的限制，也导致了从电子空穴激发到Tb3+的更有效的能量转移。结果表明，负责绿色发射的Tb3+ 5D4项的带间激发是通过产生自捕获激子的中间阶段实现的，而负责蓝色发射的5D3项的带间激发是通过撞击相互作用实现的。晶体结构决定了Tb3+在电子能带结构中的位置，邻近Tb3+位之间的距离对Tb3+发射的热稳定性和衰减特性有很大影响。

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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.