Organic light emitting device

Patent metadata

Field	Value
Publication number	US-9312494-B2
Application number	US-201013501123-A
Country	US
Kind code	B2
Filing date	Dec 2, 2010
Priority date	Dec 14, 2009
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Provided is an organic light emitting device with enhanced durability during continuous driving. The organic light emitting device includes: an anode, a cathode, and an organic compound layer being placed between the anode and the cathode and including at least a hole transport layer and an emission layer, in which: the emission layer contains a blue light emitting material; the hole transport layer contains a plurality of kinds of organic compounds; and an organic compound having the smallest ionization potential among the organic compounds includes a compound having no absorption spectrum peak in a blue color wavelength region in a radical cation state.

First claim

The invention claimed is:

1. An organic light emitting device comprising:
an anode;
a cathode; and
an organic compound layer being placed between the anode and the cathode and including at least a hole transport layer and an emission layer,
wherein the emission layer contains a blue light emitting material;
wherein the hole transport layer contains a plurality of kinds of organic compounds;
wherein an organic compound having the smallest ionization potential among the organic compounds includes a compound having no absorption spectrum peak in a blue color wavelength region in a radical cation state;
wherein concentration of the organic compound having the smallest ionization potential is 5% by weight or more to 30% by weight or less of the hole transport layer; and
wherein the organic compound having the smallest ionization potential is uniformly contained throughout the hole transport layer.

2. The organic light emitting device according to claim 1 , wherein a mole absorptivity coefficient of the organic compound having the smallest ionization potential in the blue color wavelength region is 5000 L·mol −1 ·cm −1 or less.

3. The organic light emitting device according to claim 1 , wherein the organic compound having the smallest ionization potential is represented by the following general formula (1):

where Ar 1 to Ar 3 each represent a fused polycyclic aromatic group or a substituted phenyl group represented by the following general formula (2):

provided that each of Ar 1 to Ar 3 may be the same as or different from the other substituents,
where R 1 and R 3 each represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, provided that any one of R 1 and R 3 represents a substituted or unsubstituted aryl group; and R 2 represents a hydrogen atom, a halogen atom, or a substituted or unsubstituted alkyl group.

4. A display apparatus comprising pixels comprising the organic light emitting device according to claim 1 and a TFT circuit that controls luminance of the organic light emitting device.

5. The organic light emitting device according to claim 1 , wherein the emission layer does not contain the organic compound having the smallest ionization potential.

6. The organic light emitting device according to claim 5 , wherein the emission layer comprises a host and a guest.

7. The organic light emitting device according to claim 1 , wherein the organic compound having the smallest ionization potential is represented by any one of the following formulae:

8. An illumination comprising the organic light emitting device according to claim 1 .

9. An electrophotographic image forming apparatus comprising a light source for forming a latent image of a photosensitive body, wherein the light source comprises the organic light emitting device according to claim 1 .

Assignees

• Nakasu Minako
• Yashima Masataka
• Muta Hajime
• Okinaka Keiji
• Yamaguchi Tomona
• Horikiri Tomonari
• Okajima Maki
• Yamada Naoki
• Canon Kk

Inventors

• Nakasu Minako
• Yashima Masataka
• Muta Hajime
• Okinaka Keiji
• Yamaguchi Tomona
• Horikiri Tomonari
• Okajima Maki
• Yamada Naoki

Classifications

• H05B33/14

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title

• C09K2211/1011

  Condensed systems · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• G03G15/04036

  Details of illuminating systems, e.g. lamps, reflectors (lamp housings for copying cameras, reflex exposure lighting G03B27/542) · CPC title