TY  - JOUR
AU  - Jamal, Muhammad Usama
AU  - Nagirnyi, Vitali
AU  - Chernenko, Kirill
AU  - Kotlov, Aleksei
AU  - Smortsova, Yevheniia
AU  - Spassky, Dmitry
TI  - 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
JO  - Materials research bulletin
VL  - 191
SN  - 0025-5408
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - PUBDB-2025-03866
SP  - 113553
PY  - 2025
N1  - ISSN 0025-5408 not unique: **2 hits**.   Waiting for fulltext 
AB  - Luminescent properties of KTb(MoO<sub>4</sub>)<sub>2</sub> and K5Tb(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. 
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1016/j.materresbull.2025.113553
UR  - https://bib-pubdb1.desy.de/record/637538
ER  -