Organic electroluminescent device

• US 20040137267A1
• Filed: 12/18/2003
• Published: 07/15/2004
• Est. Priority Date: 12/27/2002
• Status: Active Grant

• Current Assignee: UDC Ireland Limited (Universal Display Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Ise, Toshihiro, Igarashi, Tatsuya
• Granted Patent: US 7,291,405 B2
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1033 with oxygen
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1059 containing three nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/181 of the alkali metals and alkaline earth metals
• CPC Class Codes: C09K 2211/182 of the rare earth metals, i.e. Sc, Y or lanthanide
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• 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 85/30 Coordination compounds
• CPC Class Codes: H10K 85/341 Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/346 comprising platinum
• CPC Class Codes: H10K 85/351 Metal complexes comprising lanthanides or actinides, e.g. comprising europium
• CPC Class Codes: H10K 85/636 comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/657 Polycyclic condensed heteroaromatic hydrocarbons
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a metal complex containing a metal in groups 4 to 11 or periods 5 to 6 of a Periodic Table.

Claims

1. An organic electroluminescent device comprising:

a pair of electrodes; and

at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer,

wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a metal complex containing a metal in groups 4 to 11 or periods 5 to 6 of a Periodic Table.

2. The organic electroluminescent device of claim 1, wherein the metal of the metal complex is selected from the group consisting of titanium, iron, manganese, nickel, copper, rubidium, strontium, zirconium, molybdenum, ruthenium, rhodium, palladium, silver, indium, tin, antimony, cesium, barium, a rare earth metal, tungsten, rhenium, osmium, iridium, platinum and gold as a center metal.

3. The organic electroluminescent device of claim 1, wherein the metal of the metal complex is selected from the group consisting of rhodium, palladium, barium, cerium, thulium, gadolinium, rhenium, iridium, and palladium as a center metal.

4. The organic electroluminescent device of claim 1, wherein the metal of the metal complex is selected from the group consisting of rhodium, palladium, rhenium, iridium, and platinum as a center metal.

5. The organic electroluminescent device of claim 1, wherein the metal of the metal complex is selected from the group consisting of rhodium and palladium as a center metal.

6. The organic electroluminescent device of claim 1, wherein the host material is a compound selected from the group consisting of a compound represented by the formula (I), a compound represented by the formula (II), a compound represented by the formula (III), a compound represented by the formula (IV), a compound represented by the formula (V), and a compound represented by the formula (VI):

7. The organic electroluminescent device of claim 1, wherein the luminescent material is a phosphorescent compound.

8. The organic electroluminescent device of claim 7, wherein the host material and the phosphorescent compound have a T₁ value of 60 kcal/mol or higher, and the phosphorescent compound emits phosphorescence having a peak wavelength of 550 nm or shorter.

9. The organic electroluminescent device of claim 7, wherein the phosphorescent compound is an iridium complex, a platinum complex, a rhenium complex, a ruthenium complex, a palladium complex, a rhodium complex or a rare earth complex.

10. The organic electroluminescent device of claim 1, wherein the at least one organic compound layer is at least three organic compound layers including a hole transporting layer, a light emitting layer, and an electron transporting layer, and the electron transporting layer contains a compound having an IP value of 5.9 eV or higher.

11. An organic electroluminescent device comprising:

a pair of electrodes; and

at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer,

the light emitting layer contains at least one host material and at least one phosphorescent material, and the host material is a metal complex containing a metal selected from the group consisting of titanium, iron, manganese, nickel, copper, rubidium, strontium, zirconium, molybdenum, ruthenium, rhodium, palladium, silver, indium, tin, antimony, cesium, barium, a rare earth metal, tungsten, rhenium, osmium, iridium, platinum and gold as a center metal.

12. The organic electroluminescent device of claim 11, wherein the light emitting layer is free from a fluorescent compound, and the phosphorescent material substantially emits light.

13. The organic electroluminescent device of claim 11, wherein the host material is a compound selected from the group consisting of a compound represented by the formula (I), a compound represented by the formula (II), a compound represented by the formula (III), a compound represented by the formula (IV), a compound represented by the formula (V), and a compound represented by the formula (VI):

14. The organic electroluminescent device of claim 11, wherein the host material and the phosphorescent material have a T₁ value of 60 kcal/mol or higher, and the phosphorescent material emits phosphorescence having a peak wavelength of 550 nm or shorter.

15. The organic electroluminescent device of claim 11, wherein the phosphorescent material is an iridium complex, a platinum complex, a rhenium complex, a ruthenium complex, a palladium complex, a rhodium complex or a rare earth complex.

16. The organic electroluminescent device of claim 11, wherein the at least one organic compound layer is at least three organic compound layers including a hole transporting layer, a light emitting layer, and an electron transporting layer, and the electron transporting layer contains a compound having an IP value of 5.9 eV or higher.

17. The organic electroluminescent device of claim 11, wherein the metal of the metal complex is selected from the group consisting of rhodium, palladium, barium, cerium, thulium, gadolinium, rhenium, iridium, and palladium as a center metal.

18. The organic electroluminescent device of claim 11, wherein the metal of the metal complex is selected from the group consisting of rhodium, palladium, rhenium, iridium, and platinum as a center metal.

19. The organic electroluminescent device of claim 11, wherein the metal of the metal complex is selected from the group consisting of rhodium and palladium as a center metal.