Light emitting device

Details Light emitting device Light emitting device

2005-02-25

2009-12-22

Tarazano, D. Lawrence (Department: 1794)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S506000, C428S690000, C428S917000, C257S040000, C257SE51049

Reexamination Certificate

active

07635946

ABSTRACT:
To provide an organic electroluminescent device having excellent durability and having high luminous efficiency and luminance, the organic electroluminescent device includes an organic compound layer containing a hole transport layer, a light emitting layer, a block layer, and an electron transport layer between a pair of electrodes, wherein the block layer contains an electron transport material and an electrically inactive organic compound capable of being subjected to dry film formation and having an energy difference Eg between highest occupied molecular orbital and lowest unoccupied molecular orbital of 4.0 eV or more.

REFERENCES:
patent: 6303238 (2001-10-01), Thompson et al.
patent: 2003/0039858 (2003-02-01), Igarashi et al.
patent: 2003/0168970 (2003-09-01), Tominaga et al.
patent: 2005/0019604 (2005-01-01), Thompson et al.
patent: 2002-180040 (2002-06-01), None
patent: WO 02/43449 (2002-05-01), None
Baldo et al., “Very high-efficiency green organic light-emitting devices based on electrophosphorescence”, Applied Physics Letters, vol. 75, No. 1, Jul. 1999, pp. 4-6.
Tsutsui et al., “High quantum efficiency in organic light-emitting devices with iridium-complex as a triplet emissive center”, Japanese Journal of Applied Physics, vol. 38, 1999, pp. 1502-1504.
Kwong et al., “High operational stability of electrophosphorescent devices”, Applied Phsycis Letters, vol. 81, No. 1, Jul. 2002, pp. 162-164.
Adamovich et al., “New charge-carrier blocking materials for high efficiency OLEDs”, Organic Electrics, vol. 4, 2003, pp. 77-87.

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