Organic light-emitting device

Details Organic light-emitting device Organic light-emitting device

2006-10-12

2008-12-16

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S506000

Reexamination Certificate

active

07466074

ABSTRACT:
In an organic light-emitting device which uses, in particular, a light-emitting layer material having a wide band gap, a lowering in emission intensity due to continuous driving is alleviated while maintaining a high emission efficiency. There is provided an organic light-emitting device in which a hole-transporting layer contains a second component in addition to a main component; an energy of a lowest triplet excited state of the second component is less than an energy of a lowest triplet excited state of the main component of the hole-transporting layer; a lowest unoccupied molecular orbital energy of the second component is higher than a lowest unoccupied molecular orbital energy of the main component of a light-emitting layer; and the second component has an energy gap of 2.7 eV or more.

REFERENCES:
patent: 7034454 (2006-04-01), Kawai et al.
patent: 2006/0017376 (2006-01-01), Okinaka et al.
patent: 2002-359080 (2002-12-01), None
Sakamoto, G. et al., “Significant improvement of device durability in organic light-emitting diodes by doping both hole transport and emitter layers with rubrene molecules”, Appl. Phys. Lett., 75 (6), pp. 766-768, 1999.

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