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Diamond-like carbon films for electroluminescent applications

TitleDiamond-like carbon films for electroluminescent applications
Publication TypeJournal Article
Year of Publication1990
AuthorsKim, S. B., J. F. Wager, and D. C. Morton
JournalSurface and Coatings Technology
Pagination99 - 106
Date Published12/1990

Diamond-like carbon (DLC) films grown by plasma-enhanced chemical vapor deposition are employed for the first time as an active layer in an alternating current (a.c.) thin-film electroluminescent (ACTFEL) device configuration. The ACTFEL device configuration consists of the DLC active layer sandwiched between two insulating layers which are contacted by a reflecting and transparent electrode. A large a.c. waveform with a small duty cycle is applied with a sufficiently large amplitude so that the DLC layer electrically breaks down; the insulators prevent this breakdown from being catastrophic. Electroluminescence arises from radiative recombination of electrons and holes via bandtail-to-bandtail states. This type of luminescence is inherently very broad band and the electroluminescence appears white. We have been able to produce electroluminescent emission well into the UV region of the electromagnetic spectrum so that these devices are potentially useful for visible and UV applications. The brightness and efficiency of our devices are very low to date: 0.5 ft lambert and 0.002 lm W-ยน.

Short TitleSurface and Coatings Technology