1 School of Materials Science and Engineering, Hanoi University of Science and Technology (HUST), No. 01 Dai Co Viet, Hanoi 100000, Vietnam
2 Laboratory of Biomedical Materials, Hanoi University of Science and Technology (HUST), No. 01 Dai Co Viet, Hanoi 100000, Vietnam
3 Department of Physics and Chemical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet Road, Hanoi 11917, Vietnam
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Author to whom correspondence should be addressed.
Materials 2024, 17(13), 3376; https://doi.org/10.3390/ma17133376
Submission received: 13 May 2024 / Revised: 14 June 2024 / Accepted: 23 June 2024 / Published: 8 July 2024
(This article belongs to the Section Thin Films and Interfaces)
Abstract
The present study investigates the effects of Er3+ doping content on the microstructure and up-conversion emission properties of CaTiO3: Er3+ phosphors as a potential material in biomedical applications. The CaTiO3: x%Er3+ (x = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0%) films were synthesized on Ti substrates by a hydrothermal reaction at 200 °C for 24 h. The SEM image showed the formation of cubic nanorod CaTiO3: Er3+ films with a mean edge size value of (1–5) μm. When excited with 980 nm light, the CaTiO3: Er3+ films emitted a strong green band and a weak red band of Er3+ ions located at 543, 661, and 740 nm. The CaTiO3: Er3+ film exhibited excellent surface hydrophilicity with a contact angle of ~zero and good biocompatibility against baby hamster kidney (BHK) cells. CaTiO3: Er3+ films emerge as promising materials for different applications in the biomedical field.
Keywords: CaTiO3: Er3+ phosphor; hydrophilicity; up-conversion emission; hydrothermal method
