Abstract
Luminescence and optical transmittance measurements were performed on irradiated natural diamond crystals and on synthetic films. Their results show that variations in luminescence with annealing can be due to changes in the non-radiative processes rather than in the concentration of the investigated centre. In particular, emission from the interstitial-related 3H centre increases when the neutral vacancy (GR1) anneals out, showing that the GR1 can effectively quench 3H emission. The 3H centre was found to be stable up to 900 °C in irradiated CVD and natural diamond. As-grown CVD films also show the presence of this centre as well as of a defect, which is assigned to the distorted TR12 centre. The latter defect, labeled as TR12′, shows remarkable temperature stability, being present in films grown at 2100 °C.
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