Transient electrophosphorescence in red top-emitting organic light-emitting devices

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

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We have fabricated a red electrophosphorescent top-emitting organic light-emitting device using the phosphorescent bis[2-(2′-benzothienyl)- pyridinato-N,C3′]iridium(acetylacetonate) doped in 4,4′-N, N′-dicarbazole-biphenyl host and Alq3 electron injection layer. The emission spectrum shows a strong peak at 620 nm accompanied with a small peak at 675 nm in the red region. Time evolution of electrophosphorescence reveals a decay time of 703 μs at a voltage pulse of 5 V in a device with an emitting area of 20 mm2. Rise and delay times vary from 450 to 14 μs and 73 to 3 μs, respectively, as the voltage amplitude increases from 4.5 to 10 V. These results are compared with the red emitting device without an electron injection layer.

Original languageEnglish
Pages (from-to)4771-4773
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number20
DOIs
StatePublished - 15 Nov 2004

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