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Improving the luminescent properties of Fe3+ in CaAl4O7 by co-doping with Bi3+ ions

•Sensitization of Fe3+ luminescence via Bi3+ is investigated.•Presence of Bi3+ increases thermal stability of Fe3+ luminescence.•Presence of Bi3+ extends the excitation spectral range of Fe3+ ions. In the framework of luminescent transition metal ions-doped phosphors for near-infrared (NIR) lighting...

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Published in:Materials research bulletin 2025-01, Vol.181, p.113081, Article 113081
Main Authors: Piotrowski, W.M., Szymanski, D., Crozzolin, M., Back, M., Marciniak, L.
Format: Article
Language:English
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Summary:•Sensitization of Fe3+ luminescence via Bi3+ is investigated.•Presence of Bi3+ increases thermal stability of Fe3+ luminescence.•Presence of Bi3+ extends the excitation spectral range of Fe3+ ions. In the framework of luminescent transition metal ions-doped phosphors for near-infrared (NIR) lighting, Fe3+-activated phosphors have been recently demonstrated to be a potential alternative to the most common Cr3+ and Ni2+-based NIR materials. However, this family of phosphors still suffer from low absorption efficiency and severe thermal quenching. This study investigates the effect of Bi3+ ion concentration on the spectroscopic features of Fe3+ ions in CaAl4O7:Fe3+, Bi3+ system. The presence of the 1S0→1P1 transition band in Fe3+ PLE spectra indicates the Bi3+→Fe3+ energy transfer leading to a corresponding increase in luminescence intensity of Fe3+ ions by over 30-fold compared to Fe3+-singly doped sample. High Bi3+ concentrations also quench Bi3+ ion luminescence, improving NIR emission purity. Additionally, the presence of Bi3+ ions enhances Fe3+ ion luminescence stability by delaying the thermal depopulation, as evidenced by a T50 shift from 323 K to 393 K. Overall, co-doping CaAl4O7:Fe3+ with Bi3+ ions expands excitation spectra, boosts luminescence intensity, and enhances the thermal stability. [Display omitted]
ISSN:0025-5408
DOI:10.1016/j.materresbull.2024.113081