Organic electroluminescence element

Details Organic electroluminescence element Organic electroluminescence element

2006-10-31

2006-10-31

Yamnitzky, Marie (Department: 1774)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S212000, C428S917000, C313S504000, C313S506000, C257S102000, C257SE51044

Reexamination Certificate

active

07128982

ABSTRACT:
An organic electroluminescence element is disclosed which comprises a hole transporting layer containing a hole transporting material, a light emission layer containing a host compound and a phosphorescent compound, a hole blocking layer, and an electron transporting layer, the host compound having a band gap of from 3.3 eV to 5 eV, and having a molecular weight of not less than 500, and relationship c<d being satisfied, wherein c (eV) represents a difference between energy level of LUMO (lowest unoccupied molecular orbital) in the hole blocking layer and energy level of LUMO in the light emission layer and d (eV) represents a difference between energy level of HOMO (highest occupied molecular orbital) in the hole blocking layer and energy level of HOMO in the light emission layer.

REFERENCES:
patent: 5776623 (1998-07-01), Hung et al.
patent: 2002/0071963 (2002-06-01), Fujii
patent: 2003/0091860 (2003-05-01), Oshiyama et al.

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