ORGANIC ELECTROLUMINESCENCE DEVICE

• US 20100295027A1
• Filed: 08/21/2009
• Published: 11/25/2010
• Est. Priority Date: 05/22/2009
• Status: Abandoned Application

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Jinde, Yukitoshi, Kuma, Hitoshi, Nishimura, Kazuki, Kawamura, Yuichiro, Ogiwara, Toshinari
• Application Number:
  US12/545,425
• Publication Number:
  US 20100295027A1
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: H05B 33/14 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 Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/636 comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes

Abstract

An organic electroluminescence device includes: an anode; a cathode; and an organic thin-film layer provided between the anode and the cathode and including at least three emitting layers. The organic thin-film layer includes: a first emitting layer adjacent to the anode; a second emitting layer adjacent to the cathode; and a third emitting layer interposed between the first emitting layer and the second emitting layer. The first emitting layer, the second emitting layer and the third emitting layer contain phosphorescent dopants. The first emitting layer and the second emitting layer use fused polycyclic aromatic derivatives as host materials.

Claims

1. An organic electroluminescence device, comprising:

an anode;

a cathode; and

an organic thin-film layer provided between the anode and the cathode and comprising at least three emitting layers, wherein

the organic thin-film layer comprises;

a first emitting layer adjacent to the anode;

a second emitting layer adjacent to the cathode; and

a third emitting layer interposed between the first emitting layer and the second emitting layer,

the first emitting layer, the second emitting layer and the third emitting layer contain phosphorescent dopants, and

the first emitting layer and the second emitting layer use fused polycyclic aromatic derivatives as host materials.

2. The organic electroluminescence device according to claim 1, wherein the third emitting layer uses a heterocycle-containing compound as a host material.

3. The organic electroluminescence device according to claim 2, wherein triplet energy of the heterocycle-containing compound in the third emitting layer is larger than triplet energy of the fused polycyclic aromatic derivatives in the first emitting layer and the second emitting layer.

4. The organic electroluminescence device according to claim 1, wherein the fused polycyclic aromatic derivatives have triplet energy of 2.0 eV or more.

5. The organic electroluminescence device according to claim 1, wherein the fused polycyclic aromatic derivatives are fused polycyclic aromatic hydrocarbon.

6. The organic electroluminescence device according to claim 1, wherein emission wavelengths of the phosphorescent dopants contained in the first emitting layer and the second emitting layer are longer than an emission wavelength of the phosphorescent dopant contained in third emitting layer.

7. The organic electroluminescence device according to claim 6, wherein

the phosphorescent dopants contained in the first emitting layer and the second emitting layer emit red light, and

the phosphorescent dopant contained in the third emitting layer emits green light.

8. The organic electroluminescence device according to claim 2, wherein the fused polycyclic aromatic derivatives in the first emitting layer and the second emitting layer are naphthalene derivatives, and

the heterocycle-containing compound in the third emitting layer is a ladder-type heterocycle-containing compound.

9. The organic electroluminescence device according to claim 8, wherein the naphthalene derivatives contain at least one skeleton selected from a phenanthrene ring, florene ring, fluoranthene ring, benzo[b]fluoranthene ring, benzochrysene ring and benzophenanthrene ring.

10. The organic electroluminescence device according to claim 8, wherein the ladder-type heterocycle-containing compound is a ladder-type furan compound.

11. The organic electroluminescence device according to claim 1, wherein

the phosphorescent dopant contains a metal complex, and

the metal complex has a period 6 metal atom and a ligand.

12. The organic electroluminescence device according to claim 11, wherein the metal atom is iridium.

13. The organic electroluminescence device according to claim 1, providing white-color emission comprising:

color emission of the first emitting layer;

color emission of the second emitting layer; and

color emission of the third emitting layer.

14. The organic electroluminescence device according to claim 13, further comprising:

a second organic thin-film layer, wherein

an intermediate layer is interposed between the organic thin-film layer and the second organic thin-film layer.

15. The organic electroluminescence device according to claim 14, wherein the organic thin-film layer and the second organic thin-film layer provide different color emissions, the organic electroluminescence device providing white-color emission comprising the different color emissions.