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 language | English |
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Pages (from-to) | 4771-4773 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 85 |
Issue number | 20 |
DOIs | |
State | Published - 15 Nov 2004 |