White light-emitting organic electroluminescence (EL) device...

Details White light-emitting organic electroluminescence (EL) device... White light-emitting organic electroluminescence (EL) device...

2008-08-05

2010-10-12

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C445S024000, C445S025000

Reexamination Certificate

active

07812521

ABSTRACT:
The white light-emitting organic EL device of the present invention comprises: an anode, a cathode, at least a red light-emitting layer, a blue light-emitting layer and a green light-emitting layer provided between the anode and the cathode, and an intermediate layer between any two adjacent layers of the respective light-emitting layers, wherein, when CIE chromaticity coordinates of a dopant incorporated into the red light-emitting layer are represented by (xR, yR), CIE chromaticity coordinates of a dopant incorporated into the blue light-emitting layer are represented by (xB, yB), CIE chromaticity coordinates of a dopant incorporated into the green light-emitting layer are represented by (xG, yG), and target CIE chromaticity coordinates of white light emitted from the device are represented by (xt, yt), Δy represented as a difference between yRand yB, and Δx represented as a difference between xGand xtsatisfy the following relationships:in-line-formulae description="In-line Formulae" end="lead"?Δy≦0.18in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Δx≦0.10.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 2006/0040132 (2006-02-01), Liao et al.
patent: 2006/0046095 (2006-03-01), Ragini et al.
patent: 2006/0108592 (2006-05-01), Nishimura et al.
patent: 2007/0278937 (2007-12-01), Forrest et al.
patent: 2008/0238305 (2008-10-01), Kondo et al.
patent: 2004-063349 (2004-02-01), None
patent: WO2005/117499 (2005-12-01), None

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