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| Home > Publications database > Crystal structure controlled energy transfer to Tb$^{3+}$ in KTb(MoO$_4$)$_2$ and K$_5$Tb(MoO$_4$)$_4$ crystals |
| Home > Publications database > Crystal structure controlled energy transfer to Tb$^{3+}$ in KTb(MoO$_4$)$_2$ and K$_5$Tb(MoO$_4$)$_4$ crystals |
| Journal Article | PUBDB-2025-03866 |
; ; ; ; ;
2025
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.materresbull.2025.113553
Abstract: Luminescent properties of KTb(MoO$_4$)$_2$ and K5Tb(MoO$_4$)$_4$ crystals, possessing the same elemental composition but different crystal structures, were studied. The structural arrangement of Tb$^{3+}$ ions, ordered in KTb(MoO$_4$)$_2$ and disordered in K$_5$Tb(MoO$_4$)$_4$, determines their luminescence properties. Partial lattice disorder of K$_5$Tb(MoO$_4$)$_4$ results in broadened bands of Tb$^{3+}$ emission and excitation spectra, but also in more efficient energy transfer from electron-hole excitations to Tb$^{3+}$ due to the disorder-induced limitation of charge carriers’ mean path. It is shown that interband excitation of the Tb$^{3+5}$ D$_4$ terms responsible for the green emission is realized via the intermediate stage of self-trapped exciton creation, while that of the $^5$D$_3$ terms responsible for the blue emission is realized through the impact interaction. Crystal structure determining the position of Tb$^{3+}$ states in the electronic energy band structure and the distance between neighboring Tb$^{3+}$ sites was found to strongly influence thermal stability and decay characteristics of the Tb$^{3+}$ emission.
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