# US 10,312,474 B2 · Organic electroluminescent device comprising a plurality of light emissive units > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,474 B2 - Document ID: US10312474B2 - Status: Granted - Kind: B2 - Application number: 15/993,516 - Filed: 2018-05-30 - Published: 2018-09-27 - Granted: 2019-06-04 - Earliest claimed: 2002-03-26 - Assignees: Rohm Co., Ltd.; Junji Kido; Mitsubishi Heavy Industries, Ltd. - Applicants: Rohm Co., Ltd.; Junji Kido; Mitsubishi Heavy Industries, Ltd. - Inventors: Junji Kido; Toshio Matsumoto - Web page: https://patentgrep.com/patent/US10312474B2 ## CPC - C07C 211/58: Naphthylamines; N-substituted derivatives thereof - C07C 211/61: with at least one of the condensed ring systems formed by three or more rings - C09K 11/06: containing organic luminescent materials - H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light - H10K 50/131: {with spacer layers between the electroluminescent layers} - H10K 50/15: Hole transporting layers - H10K 50/16: Electron transporting layers - H10K 50/17: Carrier injection layers - H10K 50/171: {Electron injection layers} - H10K 50/19: Tandem OLEDs - C07C 2603/18: Fluorenes; Hydrogenated fluorenes - C09K 2211/1003: Carbocyclic compounds - C09K 2211/1007: Non-condensed systems - C09K 2211/1011: Condensed systems - C09K 2211/1014: bridged by heteroatoms, e.g. N, P, Si or B - H10K 59/875: {Arrangements for extracting light from the devices} - H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour - H10K 85/60: Organic compounds having low molecular weight (H10K85/10 - H10K85/50 take precedence) - H10K 85/624: {containing six or more rings} - H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene} - H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom} - Y10T 428/24942: including components having same physical characteristic in differing degree - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An organic electroluminescent device includes at least two light-emissive units provided between a cathode electrode and an anode electrode opposed to the cathode electrode, each of the light-emissive units including at least one light-emissive layer. The light-emissive units are partitioned from each other by at least one charge generation layer, the charge generation layer being an electrically insulating layer having a resistivity of not less than 1.0×102 Ωcm. ## Claims ### Claim 1 A display device comprising an organic electroluminescent element comprising a plurality of light emissive units, each of which has at least one light-emissive layer, and which are provided between a first electrode and a second electrode opposed to said first electrode, wherein said light emissive units are partitioned from each other by at least one charge generation layer, wherein said charge generating layer comprises an organic layer made by an organic material, and said light-emissive layer comprises an organic layer made by an organic material, wherein said organic layers have substantially the same resistivity, wherein said light-emissive units have mutually different emission spectrums, wherein said organic electroluminescent element is configured to emit light from an area where said first electrode and said second electrode are vertically superimposed, and wherein said area comprises a plurality of areas, each of said plurality of areas corresponding to pixels of the display device. ### Claim 2 (depends on 1) The display device according to claim 1, wherein said light emissive layer contains one of a fluorescent material and a phosphorescent material. ### Claim 3 (depends on 1) The display device according to claim 1, wherein said organic electroluminescent element is configured to emit white light due to superimposition of different emission spectrums of each light-emissive unit. ### Claim 4 (depends on 1) The display device according to claim 1, wherein said charge generation layer has a visible light transmittance of at least 50%. ### Claim 5 (depends on 1) The display device according to claim 1, wherein said organic electroluminescent element is configured to emit light only from where an area forming said first electrode and said second electrode are vertically superimposed. ### Claim 6 (depends on 1) The display device according to claim 1, wherein said charge generation layer comprises an electron accepting material and an electron donating material. ### Claim 7 (depends on 6) The display device according to claim 6, wherein said electron donating material comprises an arylamine compound, wherein said arylamine compound is represented by the following formula (I): wherein Ar1, Ar2 and Ar3 each independently represents an aromatic hydrocarbon group which are allowed to have substituents. ### Claim 8 (depends on 7) The display device according to claim 7, wherein said arylamine compound has a glass transition temperature of at least 90° C. ### Claim 9 (depends on 7) The display device according to claim 7, wherein said arylamine compound has an ionization potential of less than 5.7 eV. ### Claim 10 (depends on 6) The display device according to claim 6, wherein said electron accepting material comprises an organic material having at least one cyano group or at least one fluorine group. ### Claim 11 (depends on 6) The display device according to claim 6, wherein said electron accepting material comprises an organic material having both at least one cyano group and at least one fluorine group. ### Claim 12 (depends on 1) The display device according to claim 1, wherein said first electrode comprises an anode selected from ITO (indium tin oxide) or IZO (indium zinc oxide). ### Claim 13 (depends on 1) The display device according to claim 1, wherein said second electrode comprises a cathode selected from ITO (indium tin oxide) or IZO (indium zinc oxide). ### Claim 14 (depends on 11) The display device according to claim 11, wherein said second electrode comprises a cathode selected from one of Al (aluminum) and Ag (silver). ### Claim 15 (depends on 1) The display device according to claim 1, wherein said organic electroluminescent element comprises an electron injection layer as a layer that contacts with said charge generation layer on a side of said first electrode, and wherein said electron injection layer comprises an organic material and an electron donating dopant. ### Claim 16 (depends on 15) The display device according to claim 15, wherein a thickness of said electron injection layer is less than 5 nm. ### Claim 17 (depends on 1) The display device according to claim 1, wherein said organic electroluminescent element comprises a hole injection layer as a layer that contacts with said charge generation layer on the side of said second electrode, and wherein said hole injection layer comprises an organic material and an electron donating dopant. ### Claim 18 (depends on 16) The display device according to claim 16, wherein a thickness of said hole injection layer is less than 30 nm. ### Claim 19 (depends on 1) The display device according to claim 1, wherein the first electrode and the second electrode are both in the form of a strip. ### Claim 20 (depends on 19) The display device according to claim 19, wherein the first electrode and the second electrode are crossed, thereby forming the area where the first electrode and the second electrode are vertically superimposed. ### Claim 21 A method of emitting light from a device comprising applying a voltage to an organic electroluminescent element within the device, wherein the electroluminescent element comprises comprising a plurality of light emissive units, each of which has at least one light-emissive layer, and which are provided between a first electrode and a second electrode opposed to said first electrode, wherein said light emissive units are partitioned from each other by at least one charge generation layer, wherein said charge generating layer comprises an organic layer made by an organic material, and said light-emissive layer comprises an organic layer made by an organic material, wherein said organic layers have substantially the same resistivity, wherein said light-emissive units have mutually different emission spectrums, wherein said organic electroluminescent element is configured to emit light from an area where said first electrode and said second electrode are vertically superimposed, and wherein said area comprises a plurality of areas, each of said plurality of areas corresponding to pixels of the display device. ### Claim 22 (depends on 21) The method of claim 21, wherein the charge generation layer has a resistivity of not less than 1.0×102 Ωcm. ### Claim 23 (depends on 21) The method of claim 21, wherein the charge generation layer has a resistivity of not less than 1.0×105 Ωcm. ### Claim 24 (depends on 21) The method of claim 21, wherein the charge generation layer comprises a laminated layer of said electron accepting material and said electron donating material. ### Claim 25 (depends on 21) The method of claim 21, wherein the first electrode and the second electrode are both in the form of a strip. ### Claim 26 (depends on 21) The method of claim 21, wherein the first electrode and the second electrode are crossed, thereby forming the area where the first electrode and the second electrode are vertically superimposed. ### Claim 27 A display device comprising an organic electroluminescent element comprising a plurality of light emissive units, each of which has at least one light-emissive layer, and which are provided between a first electrode and a second electrode opposed to said first electrode, wherein said light emissive units are partitioned from each other by at least one partition layer capable of injecting an electron for an anode direction of the device as well as injecting a hole for a cathode direction of the device upon voltage being applied, wherein said partition layer comprises an organic layer made by an organic material, and said light-emissive layer comprises an organic layer made by an organic material, wherein said organic layers have substantially the same resistivity, wherein said light-emissive units have mutually different emission spectrums, wherein said organic electroluminescent element is configured to emit light from an area where said first electrode and said second electrode are vertically superimposed, and wherein said area comprises a plurality of areas, each of said plurality of areas corresponding to pixels of the display device.