Failure of the top emission organic light-emitting device with a Ca/Ag semitransparent cathode

D. G. Moon, R. B. Pode, C. J. Lee, J. I. Han

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The influence of vacuum conditions during the deposition of Ca/Ag cathode on the performance of top emission organic light-emitting devices (TEOLEDs) is investigated. The fabricated devices have been characterized by current-voltage (I-V) and electroluminescence (EL) measurements. Low turn-on voltage and high yield of EL are observed if the cathode is deposited in a better background pressure than 2.78 × 10-6 Torr, whereas the deposition of cathode in a poor back ground pressure (<2.78 × 10-6 Torr) leads to device failure. It is argued that the partial oxidation of Ca significantly improves the transparency of the Ca/Ag cathode while remaining conducting, whereas the complete oxidation of Ca (formation of Ca-O bonds) results into device failure.

Original languageEnglish
Pages (from-to)63-68
Number of pages6
JournalSynthetic Metals
Volume146
Issue number1
DOIs
StatePublished - 14 Oct 2004

Keywords

  • Ca oxidation
  • Ca/Ag semitransparent cathode
  • Device failure
  • Top emission organic light-emitting devices (TEOLEDs)
  • Transmittance

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