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Understanding the Influence of Electron Traps and Urbach States on the Kinetics of Ti3+ Persistent Luminescence in LaAlO3:Ti3+
Autorzy
Rok wydania
2025
Czasopismo
Numer woluminu
64
Strony
3137-3149
DOI
10.1021/acs.inorgchem.5c00390
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The luminescence kinetics of Ti3+ ions, resulting from the spin-allowed 2E → 2T2 electron transition, are generally expected to be fast, within the microsecond range. However, in this study, we observed average lifetimes of up to 30 ms in nanocrystalline LaAlO3:Ti3+ powders. Our detailed analysis of the spectroscopic and thermoluminescence properties of LaAlO3:Ti3+ suggests that this prolonged Ti3+ kinetics is associated with the presence of electron traps and the proximity of the Ti3+ excited state to the conduction band, which facilitates energy transfer between them. Furthermore, the observed shift in Urbach states with an increasing Ti3+ concentration correlates with the efficiency of energy transfer between deeper traps and Ti3+ ions. This study provides a comprehensive strategy for controlling the luminescence kinetics of Ti3+ ions through electron trap engineering, induced by dopant ion concentration, which can be applied in various fields including luminescence thermometry.
Słowa kluczowe
Energy, Ions, Kinetics, Luminescence, Materials
Licencja otwartego dostępu
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Pełny tekst licencji: https://creativecommons.org/licenses/by/3.0/pl/legalcode
Adres publiczny
http://dx.doi.org/10.1021/acs.inorgchem.5c00390
Strona internetowa wydawcy
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