Organic electroluminescent element having plurality of light...

Details Organic electroluminescent element having plurality of light... Organic electroluminescent element having plurality of light...

2007-09-26

2010-02-16

Guharay, Karabi (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S504000

Reexamination Certificate

active

07663309

ABSTRACT:
In an organic EL element, a light-emitting layer is divided into at least three layers in a thickness direction including a light-emitting layer A close to an anode, a light-emitting layer C close to a cathode and a light-emitting layer B between the light-emitting layers A and C, wherein in one embodiment a thickness (a) of the light-emitting layer A, a thickness (c) of the light-emitting layer C and a thickness (b) of the light-emitting layer B satisfy the relationship of a<b<c, and an intermediate layer containing an electron blocking material is disposed between the divided light-emitting layers; and in another embodiment, the relationship of a>b>c is satisfied, and an intermediate layer containing a hole blocking material is disposed between the divided light-emitting layers.

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Sung Soo Lee et al. , White light emission obtained by direct color mixing in multi-layer organic light-emitting Devices, Jan. 25, 2002, Korean J. Chem. Eng., 19(3) 463-466.
Kido, J. et al.; Science, vol. 267, No. 3, pp. 1332-1334 (1995).

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