Organic electroluminescent device

Details Organic electroluminescent device Organic electroluminescent device

2011-04-12

2011-04-12

Tarazano, D. Lawrence (Department: 1786)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S917000, C313S504000, C313S506000, C252S301160, C257S040000, C257SE51051

Reexamination Certificate

active

07923128

ABSTRACT:
The invention provides an organic electroluminescent device having at least a light-emitting layer containing a light-emitting material and a host material, a hole injection-promoting layer, and a hole-transporting layer containing a hole-transporting material in this order between a pair of electrodes, in which the hole injection-promoting layer contains a hole-transporting material and has a thickness of 0.1 nm to 0.3 nm, and the relationship Ip1<Ip2<Ip3 is satisfied, when Ip1 is defined as the ionization potential of the hole-transporting material of the hole-transporting layer, Ip2 is defined as the ionization potential of the hole-transporting material of the hole injection-promoting layer, and Ip3 is defined as the ionization potential of the host material. Accordingly, the invention provides an electroluminescent device excellent in both light emitting efficiency and operation durability.

REFERENCES:
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Ren et al. “Ultrahigh energy gap hosts in deep blue organic electrophosphorescent devices.” Chem. Mater. 2004, vol. 16, No. 23, pp. 4743-4747.
Kazakov et al. “Determination of first ionization potentials from spectra of electronic loss in the vapor of polyatomic organic compounds.” J. Appl. Spectrosc. 1999. vol. 66, No. 3, pp. 375-379.
Japanese Office Action dated Nov. 30, 2010 issued in corresponding Japanese patent application No. 2006-132548.

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