Abstract
Cs3Tl2Cl9 is one of the few air stable low-phonon host lattices of interest to Er3+ upconversion. Solution growth at ambient temperature demonstrated that water and a number of other molecular liquids do not yield Er3+doped crystals. Optical and differential scanning calorimetry measurements revealed a phase segregation at 310 °C which is reversible in the presence of 1 atm Cl2 . Growth from molten salt solutions or gas phase deposition techniques is hence restricted to a deposition temperature of less than 300 °C. Preliminary results show that molten ZnCl2 may be used as a flux to obtain lanthanidedoped single crystals or epitaxial layers.
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