Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2011-03-15
2011-03-15
Hines, Anne M (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S506000
Reexamination Certificate
active
07906897
ABSTRACT:
An organic electroluminescent (EL) element includes at least a positive hole transport layer, a light emitting layer and an electron transport layer between at least a pair of electrodes, wherein the light emitting layer contains therein at least two light emitting materials having different Ea values or Ip values and emitting phosphorescence having the same color as each other, and among the two light emitting materials, a light emitting material having a larger Ea value or Ip value is contained at a higher density in a region of the light emitting layer in the vicinity of the positive hole transport layer, while a light emitting material having a smaller Ea value or Ip value is contained at a higher density in a region of the light emitting layer in the vicinity of the electron transport layer.
REFERENCES:
patent: 5281489 (1994-01-01), Mori et al.
patent: 6869695 (2005-03-01), Thompson et al.
patent: 2004-522276 (2004-07-01), None
patent: 2005-38763 (2005-02-01), None
patent: 2005038763 (2005-02-01), None
Birch & Stewart Kolasch & Birch, LLP
FUJIFILM Corporation
Hines Anne M
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