Time resolved photoluminescence of amorphous hydrogenated carbon

We measured time resolved photoluminescence of amorphous hydrogenated carbon prepared by the chemical vapour deposition technique. Depending on the bias voltage applied to the electrode used as the substrate holder, samples show more or less intense luminescence at room temperature. The decay follows a stretched exponential law with a time constant of about 70 ps for a sample prepared under zero bias. We observe that the decay time constant increases with increasing bias voltage. (C) 1998 Elsevier Science B.V. All rights reserved.