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Ce3+ doped oxide materials are promising for optical emission in the greenspectral range. The growth of CaSc2O4:Ce3+ single crystals is reported here forthe first time. Laser heated pedestal growth (LHPG) proved to be suitable forthis refractive material, if performed in nitrogen of 99.999% purity. If theoxygen content of the growth atmosphere is substantially larger, Ce4+ isformed, which shows no useful optical emission. If the oxygen content issubstantially lower, severe evaporation of calcium impedes stable crystalgrowth. Thermodynamic equilibrium calculations allowed to describe evaporationof species and cerium dopant charging under different growth conditions. Theevaporation could be investigated by quadrupole mass spectrometry of emanatinggases and by chemical analysis of fibers with ICP-OES. The congruent meltingpoint was confirmed by DTA at 2110 degrees centigrade. Photoluminescencespectrometry of fibers revealed the dependence of optical emission in the greenspectral range on growth conditions.

Laser-heated pedestal growth of cerium doped calcium scandate crystal fibers