The fast luminescence, the transient absorption spectra, and the recombination kinetics are observed and investigated in α-Al₂O₃. Absorption spectra reveal short-lived bands at 2.75 and 2.15 eV. Their decay times remain the same (30 to 200 ns) in the temperature interval 80 to 293 K. They are found to be almost the same as the lifetime of the fast components of the luminescence band at 3.8 eV. They are expected to be due to interstitial aluminium ions. Experimental results argue for subthreshold creation of short-lived Frenkel defect pairs in the cation sublattice of α-Al₂O₃.

Abstract

Die schnelle Lumineszenz und die Übergangs-Absorptionsspektren sowie die Rekombinationskinetik in α-Al₂O₃ werden untersucht. Die Absorptionsspektren zeigen Bänder mit kurzer Lebensdauer bei 2,75 und 2,15 eV. Ihre Abklingzeiten bleiben im Temperaturintervall von 80 bis 293 K die gleichen (30 bis 200ns) und stimmen annähernd mit der Lebensdauer der schnellen Komponente des Lumineszenzbandes bei 3,8 eV überein. Sie werden Zwischengitter-Al-Ionen zugeschrieben. Die Experimente sprechen für die unterschwellige Bildung von Frenkel-Defekt-Paaren kurzer Lebensdauer im Kationenuntergitter des α-Al₂O₃.

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Volume171, Issue1

1 May 1992

Pages 283-288

Short-Lived Frenkel Defects in α-Al₂O₃

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Short-Lived Frenkel Defects in α-Al₂O₃