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

Jamal, Muhammad Usama ; Nagirnyi, Vitali ; Chernenko, Kirill LU ; Kotlov, Aleksei ; Smortsova, Yevheniia and Spassky, Dmitry (2025) In Materials Research Bulletin 191.
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... (More)

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 Tb3+ 5D4 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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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Energy transfer, KTb(MoO), Luminescence, Thermal quenching
in
Materials Research Bulletin
volume
191
article number
113553
publisher
Elsevier
external identifiers
  • scopus:105004914066
ISSN
0025-5408
DOI
10.1016/j.materresbull.2025.113553
language
English
LU publication?
yes
id
9460e8df-b4c4-4096-9892-cf761bf39499
date added to LUP
2025-07-11 11:14:56
date last changed
2025-07-11 11:15:21
@article{9460e8df-b4c4-4096-9892-cf761bf39499,
  abstract     = {{<p>Luminescent properties of KTb(MoO<sub>4</sub>)<sub>2</sub> and K<sub>5</sub>Tb(MoO<sub>4</sub>)<sub>4</sub> crystals, possessing the same elemental composition but different crystal structures, were studied. The structural arrangement of Tb<sup>3+</sup> ions, ordered in KTb(MoO<sub>4</sub>)<sub>2</sub> and disordered in K<sub>5</sub>Tb(MoO<sub>4</sub>)<sub>4</sub>, determines their luminescence properties. Partial lattice disorder of K<sub>5</sub>Tb(MoO<sub>4</sub>)<sub>4</sub> results in broadened bands of Tb<sup>3+</sup> emission and excitation spectra, but also in more efficient energy transfer from electron-hole excitations to Tb<sup>3+</sup> due to the disorder-induced limitation of charge carriers’ mean path. It is shown that interband excitation of the Tb<sup>3+ 5</sup>D<sub>4</sub> terms responsible for the green emission is realized via the intermediate stage of self-trapped exciton creation, while that of the <sup>5</sup>D<sub>3</sub> terms responsible for the blue emission is realized through the impact interaction. Crystal structure determining the position of Tb<sup>3+</sup> states in the electronic energy band structure and the distance between neighboring Tb<sup>3+</sup> sites was found to strongly influence thermal stability and decay characteristics of the Tb<sup>3+</sup> emission.</p>}},
  author       = {{Jamal, Muhammad Usama and Nagirnyi, Vitali and Chernenko, Kirill and Kotlov, Aleksei and Smortsova, Yevheniia and Spassky, Dmitry}},
  issn         = {{0025-5408}},
  keywords     = {{Energy transfer; KTb(MoO); Luminescence; Thermal quenching}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Materials Research Bulletin}},
  title        = {{Crystal structure controlled energy transfer to Tb<sup>3+</sup> in KTb(MoO<sub>4</sub>)<sub>2</sub> and K<sub>5</sub>Tb(MoO<sub>4</sub>)<sub>4</sub> crystals}},
  url          = {{http://dx.doi.org/10.1016/j.materresbull.2025.113553}},
  doi          = {{10.1016/j.materresbull.2025.113553}},
  volume       = {{191}},
  year         = {{2025}},
}