VUV and cathodoluminescence spectroscopy of 12CaO · 7Al2O3

• DOI: 10.1007/s10854-008-9570-z
• Publication Date: 2008-01-22T18:13:28Z
• Authors: Eduard Feldbach; Viktor P. Denks; Marco Kirm; Peeter Liblik; Aarne Maaroos; Hugo Mändar; Tea Avarmaa; Kristjan Kunnus
• Keywords: Cathodoluminescence

Reflection, photo- and cathodoluminescence of 12CaO · 7Al2O3 (C12A7) were investigated. Smooth features observed in VUV reflection spectrum of monocrystalline C12A7 evidence its complicated crystalline structure and lattice disorder. Two luminescence bands peaking at 4.9 and 3.35 eV were revealed in C12A7 ceramics having encaged electrons and O2− ions. The 4.9 eV emission has an excitation onset at 6.8 eV, i.e. near the threshold of free electron-hole pair creation, and is assigned to the recombination of encaged electrons with valence band holes. The 3.35 eV emission is ascribed to the recombination of electrons with the holes localized at the encaged O2− ions.