TITLE

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

AUTHOR(S)
Moon, D. G.; Pode, R. B.; Lee, C. J.; Han, J. I.
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4771
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have fabricated a red electrophosphorescent top-emitting organic light-emitting device using the phosphorescent his[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 its at a voltage pulse of 5 V in a device with an emitting area of 20 mm&2sup;. 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.
ACCESSION #
15075029

 

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