Efficient blue organic light-emitting diodes based on an oligoquinoline

Kulkarni, Abhishek P.; Gifford, Angela P.; Tonzola, Christopher J.; Jenekhe, Samson A.
February 2005
Applied Physics Letters;2/7/2005, Vol. 86 Issue 6, p061106
Academic Journal
An oligoquinoline 6,6′-bis(2,4-diphenylquinoline), with excellent thermal stability and a high glass transition temperature (Tg=133 °C), was used as a blue-emitting and electron-transport material to achieve efficient blue electroluminescence. The diodes based on poly(N-vinylcarbazole) hole-transport layer and LiF/Al cathode had a stable blue emission with a peak at 453 nm, chromaticity coordinates at (0.15, 0.12), and a maximum brightness of 925 cd/m2 in air. The external quantum efficiency of 4.1% and luminous efficiency of 3.33 cd/A at 100 cd/m2 are comparable to the best blue organic light-emitting diodes (OLEDs) in the literature. These results demonstrate that oligoquinolines are promising as both blue emitters and electron-transport materials for developing high-efficiency OLEDs with a simpler architecture.


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