Abstract
The NH4NO3 molten solution system was developed to synthesize LiYF4:Er3+/Yb3+ micromaterials. The influences of the reaction temperature and time on the crystal phase and shape evolution were investigated in detail. The morphology, rotation angle and temperature dependences of the visible emission of Er3+ in LiYF4:Er3+/Yb3+ were measured under the excitation of 979 nm. The UC emission band from 455 to 670 nm with the involvement of 2 NIR photons for the sample with tetragonal bipyramid shape is much stronger than that for one with polyhedra shape and exhibits low polarization degree, whereas that at 370-430 nm involving in 2 NIR photons for the former is much weaker than that for the latter and possesses high polarization degree. Finally, the temperature sensitive visible upconversion fluorescence characteristics of Er3+ in tetragonal bipyramid-like LiYF4:Er3+/Yb3+ micromaterials at temperatures between 300 and 10 K are investigated and discussed in detail.
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