The role of the Tm3+ concentration on CaMoO4 properties processed by microwave hydrothermal under stirring condition

Carla Marina Santos Feldhaus, Roseli Künzel, Máximo Siu Li, Carla Marina Santos Feldhaus, Roseli Künzel, Máximo Siu Li, Ana Paula de Azevedo Marques

The role of the Tm3+ concentration on CaMoO4 propertiesThe role of the Tm3+ concentration on CaMoO4 propertiesprocessed by microwave hydrothermal under stirring condition

Journal of the American Ceramic Society
2021
122343,
ISSN:1551-2916
DOI: 10.1111/jace.17813
(https://ceramics.onlinelibrary.wiley.com/doi/abs/10.1111/jace.17813)
Abstract: The compounds based on calcium molybdate (CaMoO₄) are the subject of extensive research due to their excellent optical properties and a broad range of potential technological applications. In this work, we report a systematic study of CaMoO₄:Tm³⁺ phosphors synthesized by coprecipitation and processed in a microwave‐hydrothermal system at low temperature (100°C) and stirring. The effect of the Tm³⁺ doping content (0%–12%) is studied in full detail to understand their role in the CaMoO₄:Tm³⁺ morphological, structural, and luminescent properties. The X‐ray diffraction, Raman, and Fourier Transform Infrared spectroscopic techniques revealed that all the prepared powders have a tetragonal crystal structure with a distinct density of cation vacancies and structural disorders. The band gap remains almost constant for doping levels lower than 8%, but it narrows strongly for powders doped with 12% Tm³⁺ ions. The designed phosphors have shown two emission bands in which intensity depends on the Tm³⁺ ions doping level. For doping levels lower than 2%, the photoluminescence profile displays a broad emission band peaking at 543 nm (green). For concentrations higher than 4%, the band centered at 543 nm decreases in intensity and the near‐infrared emission band at around 800 nm, assigned to ³F₃, ³H₄ → ³H₆ transitions from Tm³⁺ ion, become more intense. The outcomes of this work reveal that appropriated Tm³⁺ ions doping levels can be applied to suppress the PL emission in the visible range and improve that in the near‐infrared region in CaMoO₄‐based materials.