Room temperature photoluminescence from nanostructured amorphous carbon

Henley, S. J.; Carey, J. D.; Silva, S. R. P.
December 2004
Applied Physics Letters;12/20/2004, Vol. 85 Issue 25, p6236
Academic Journal
Visible room-temperature photoluminescence (PL) was observed from hydrogen-free nanostructured amorphous carbon films deposited by pulsed laser ablation in different background pressures of argon (PAr). By varying PAr from 5 to 340 mTorr, the film morphology changed from smooth to rough and at the highest pressures, low-density filamentary growth was observed. Over the same pressure regime an increase in the ordering of sp2 bonded C content was observed using visible Raman spectroscopy. The origin of the PL is discussed in terms of improved carrier localization within an increased sp2 rich phase.


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