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Abstract
7CaO⋅12Al2O3 (C12A7) and Ho3+-doped 7CaO⋅12Al2O3 (C12A7–Ho3+) polycrystal powders were synthesized via co-precipitation followed by sintering at 1173K. Crystal structures, thermodynamics characters and optical properties of crashed samples were examined by XRD, DSC/TG, FT-IR and Raman spectra analysis, respectively. Activation energy of crystallization for C12A7 polycrystals was calculated according to both Ozawa/Kissinger and modified Ozawa/Kissinger methods to be 813 or 791 (for the former, only considering crystallization) and 1084 or 1077kJmol−1 (for the latter, taking both crystallization and nucleation into consideration) respectively. Growth morphology parameter (m) and crystallization mechanism index (n) of C12A7 were determined to be m=3 and n=4. Fluorescence effects of Raman spectra around 2000–2300cm−1 and pure visible up-conversion emission centered at 540nm were observed from C12A7–Ho3+ (1, 2 and 5mol.%) powders under 488nm laser diode and 808nm Xe lamp excitation, respectively. Two mechanisms were proposed to explain up-conversion of pure green light process.
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