Solvothermal synthesis of CeF3: Tm3+, Yb3+ microcrystals with visible upconversion luminescence by 980 nm excitation

CeF3: Tm3+, Yb3+ microcrystals have been successfully synthesized by a solvothermal method with further calcinations. The crystalline phase, size and optical properties were characterized using powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and upconversion luminescence (UCL). All the as-prepared samples showed blue emissions (450, 475 nm) and red emission (649 nm) under 980 nm excitation. The main mechanism that allows for upconversion is attributed the energy transfer (ET) among Yb3+ and Tm3+ ions in excited states. The results illustrate the large potential of this new class of material for photonic applications involving optoelectronics devices.

► A simple solvothermal method has been used to prepare CeF3: Tm3+, Yb3+ nanoplates with further calcinations. ► The visible upconversion emission of Tm3+, Yb3+ in CeF3 nanoplates was observed and never been reported before. ► The upconversion mechanisms of CeF3: Tm3+, Yb3+ nanoplates have been investigated.