Infrared to visible upconversion emissions of La1–0.02–xEr0.02YbxOF nanorods

Comparative Investigation of Green and Red Upconversion Luminescence in Er3+ Doped and Yb3+/Er3+ Codoped LaOCl

“…Rare earth oxyhalides (represented by LnOX, Ln = Y, lanthanide ions; X = F, Cl, Br) are previously rated as preeminent solid electrolytes, yielding the highest reported ion conductivities thus far for halogen ions conduction . In these years, intensive investigations have been focused to develop the luminescence phosphors of oxyhalides of lanthanides . Among them, lanthanide oxychlorides, LaOCl, is known for the low maximum phonon cutoff energy, high chemical stability, and ability to promote efficacious phonon energy transfer to dopant ions, which are originating from the low phonon vibrational energy and high ionicity of the rare earth to chlorine bond .…”

“…Considerable attention has recently been devoted to the synthetic approaches on LnOX nanocrystals for both fundamental research of synthetic chemistry and a wide range of potential applications . To fabricate the LnOX‐type compounds, many preparation strategies have been developed, such as, high‐temperature solid‐state methods, hydrothermal syntheses, mechanochemical grinding, sol‐gel processes, thermolysis methods of trifluoroacetate precursors, and pyrohydrolyisis methods of ternary ammonium chlorometalates, and so on. However, to the best of our knowledge, only few reports are concentrated on the comparative investigations of luminescence behaviors of different activators in LnOX structure, especially the upconversion (UC) luminescence .…”