# US 7,745,990 B2 · White light emitting organic electroluminescent element and lighting device

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- Number: US 7,745,990 B2
- Document ID: US7745990B2
- Status: Granted
- Kind: B2
- Application number: 12/050,480
- Filed: 2008-03-18
- Published: 2008-10-02
- Granted: 2010-06-29
- Earliest claimed: 2007-03-29
- Assignees: Konica Minolta Holdings, Inc.
- Inventors: Toshiya Kondo; Tomoyuki Nakayama; Kunimasa Hiyama
- Web page: https://patentgrep.com/patent/US7745990B2

## CPC

- C09K 11/06: containing organic luminescent materials
- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- C09K 2211/1007: Non-condensed systems
- C09K 2211/1011: Condensed systems
- C09K 2211/1029: containing one nitrogen atom as the heteroatom
- C09K 2211/1033: with oxygen
- C09K 2211/1037: with sulfur
- C09K 2211/1044: containing two nitrogen atoms as heteroatoms
- C09K 2211/1048: with oxygen
- C09K 2211/1051: with sulfur
- C09K 2211/1059: containing three nitrogen atoms as heteroatoms
- C09K 2211/1074: containing more than three nitrogen atoms as heteroatoms
- C09K 2211/1092: containing sulfur as the only heteroatom
- C09K 2211/185: of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 85/342: {comprising iridium}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 85/6574: {comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes}
- H10K 2101/10: Triplet emission
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y10S 428/917: Electroluminescent
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A white light-emitting organic electroluminescent element is disclosed, containing a substrate having thereon: an anode; a cathode; and a plurality of light emitting layers between the anode and the cathode, wherein the plurality of light emitting layers contains: a first light emitting layer which emits a light having a predetermined wavelength; a second light emitting layer which is located at a nearer position to the anode than the first light emitting layer and emits a light having a complementary color to the light having the predetermined wavelength; and a third light emitting layer which is located at a nearer position to the cathode than the first light emitting layer and emits the light having the complementary color to the light having the predetermined wavelength.

## Claims

### Claim 1

A white light-emitting organic electroluminescent element comprising a substrate having thereon:
an anode;
a cathode; and
a plurality of light emitting layers between the anode and the cathode,
wherein the plurality of light emitting layers comprises:
a first light emitting layer which emits a light having a predetermined wavelength;
a second light emitting layer which is located at a nearer position to the anode than the first light emitting layer and emits a light having a complementary color to the light having the predetermined wavelength; and
a third light emitting layer which is located at a nearer position to the cathode than the first light emitting layer and emits the light having the complementary color to the light having the predetermined wavelength.

### Claim 2 (depends on 1)

The white light-emitting organic electroluminescent element of claim 1,
wherein one of the first light emitting layer, the second light emitting layer and the third light emitting layer is a blue light emitting layer which emits a light having a maximum luminescent wavelength of 480 nm or less.

### Claim 3 (depends on 2)

The white light-emitting organic electroluminescent element of claim 2,
wherein both the second light emitting layer and the third light emitting layer comprise:
a green light-emitting material which emits a light having a maximum luminescent wavelength of 510-570 nm; and
a red light-emitting material which emits a light having a maximum luminescent wavelength of 590-650 mm.

### Claim 4 (depends on 1)

The white light-emitting organic electroluminescent element of claim 1,
wherein at least two of the first light emitting layer, the second light emitting layer and the third light emitting layer comprise a host compound having the same chemical structure.

### Claim 5 (depends on 1)

A lighting device comprising the white light-emitting organic electroluminescent element of claim 1.