Abstract
AbstractA comparison of excitation spectra of photostimulated and ordinary luminescence enabled us for the first time to determine experimentally the framework energy gap value Eg = 6.5 eV of 12CaO · 7 Al2O3 (C12A7). The most short‐wavelength luminescence band (peaked at ∼4.5 eV) detected at 10 K can be interpreted either as luminescence of intrinsic excitations or as recombination of electrons, captured in sub‐nanometer sized cages of C12A7 crystal structure, with holes of valence band. The main peak of thermostimulated luminescence (134–137 K) is composed of two emission bands peaked at 2.8 and 4.5 eV. The calculated activation energy 0.44 eV of spectrally resolved (at 4.5 eV) thermally stimulated luminescence peak at 137 K is close to the value (0.4 eV) needed to initiate the inter‐cage charge transfer of electrons (polaron hopping) between cages. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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