# US 7,608,993 B2 · Blue organic electroluminescent device comprising dopants having ultraviolet and visible luminescent properties > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,993 B2 - Document ID: US7608993B2 - Status: Granted - Kind: B2 - Application number: 11/498,071 - Filed: 2006-08-03 - Published: 2007-03-29 - Granted: 2009-10-27 - Earliest claimed: 2005-09-05 - Assignees: Idemitsu Kosan Co., Ltd. - Inventors: Masahide Matsuura; Toshihiro Iwakuma - Web page: https://patentgrep.com/patent/US7608993B2 ## CPC - H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light - C09K 11/06: containing organic luminescent materials - 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} - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 85/342: {comprising iridium} - H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine} - H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole} - C09K 2211/1007: Non-condensed systems - C09K 2211/1011: Condensed systems - C09K 2211/1014: bridged by heteroatoms, e.g. N, P, Si or B - C09K 2211/1029: containing one nitrogen atom as the heteroatom - C09K 2211/1044: containing two nitrogen atoms as heteroatoms - C09K 2211/1059: containing 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 85/324: {comprising aluminium, e.g. Alq3} - H10K 85/40: Organosilicon compounds, e.g. TIPS pentacene - H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)} - H10K 2101/10: Triplet emission - H10K 2102/103: {comprising indium oxides, e.g. ITO} - Y10S 428/917: Electroluminescent - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A blue organic electroluminescent device (1) including at least an emitting layer (40) between an anode (20) and a cathode (60), the emitting layer (40) including a host material and a plurality of dopants, at least one of the dopants having ultraviolet luminescent properties. ## Claims ### Claim 1 A blue organic electroluminescent device comprising at least an emitting layer between an anode and a cathode, the emitting layer comprising a host material and a plurality of dopants, at least one of the dopants having ultraviolet luminescent properties, and at least one of the dopants having visible luminescent properties. ### Claim 2 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the dopant having ultraviolet luminescent properties has a peak of 450 nm or less in the ultraviolet luminescence region. ### Claim 3 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the dopant having ultraviolet luminescent properties has a triplet energy gap greater than the triplet energy gap of the dopant having visible luminescent properties. ### Claim 4 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein at least one of the dopants has an ionization potential lower than the ionization potential of the host material. ### Claim 5 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein at least one of the dopants has an electron affinity lower than the electron affinity of the host material. ### Claim 6 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein at least one of the dopants is a heavy metal complex. ### Claim 7 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein all of the dopants are heavy metal complexes. ### Claim 8 (depends on 6) The blue organic electroluminescent device according to claim 6, wherein at least one of the heavy metal complexes is a carbene complex or a pyrazole complex. ### Claim 9 (depends on 6) The blue organic electroluminescent device according to claim 6, wherein at least one of the dopants has an ionization potential lower than that of the host material and a luminous intensity one tenth or less that of the luminous (EL) peak wavelength from the device. ### Claim 10 (depends on 6) The blue organic electroluminescent device according to claim 6, comprising a hole transporting layer between the emitting layer and the anode, wherein at least one of the heavy metal complexes has a triplet energy gap smaller than the triplet energy gap of at least one compound forming the hole transporting layer. ### Claim 11 (depends on 10) The blue organic electroluminescent device according to claim 10, wherein at least one of the heavy metal complexes has a triplet energy gap smaller than the triplet energy gap of at least one compound forming the hole transporting layer in an amount of 0.2 eV or more. ### Claim 12 (depends on 6) The blue organic electroluminescent device according to claim 6, comprising an electron transporting layer between the emitting layer and the cathode, wherein at least one of the heavy metal complexes has a triplet energy gap smaller than the triplet energy gap of at least one compound forming the electron transporting layer. ### Claim 13 (depends on 12) The blue organic electroluminescent device according to claim 12, wherein at least one of the heavy metal complexes has a triplet energy gap smaller than the triplet energy gap of at least one compound forming the electron transporting layer in an amount of 0.2 eV or more. ### Claim 14 (depends on 6) The blue organic electroluminescent device according to claim 6, comprising a hole transporting layer between the emitting layer and the anode and an electron transporting layer between the emitting layer and the cathode, wherein at least one of the heavy metal complexes has a triplet energy gap smaller than the triplet energy gap of at least one of compounds forming the hole transporting layer and the electron transporting layer. ### Claim 15 (depends on 14) The blue organic electroluminescent device according to claim 14, wherein at least one of the heavy metal complexes has a triplet energy gap smaller than the triplet energy gap of at least one of compounds forming the hole transporting layer and the electron transporting layer in an amount of 0.2 eV or more. ### Claim 16 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the visible luminescent dopant is a metal complex of Ir, Pt, Os, Pd or Au. ### Claim 17 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the host material is selected from the group consisting of amine derivatives, carbazole derivatives, oxadiazole derivatives, triazole derivatives, benzoxazole type, benzothiazole type, and benzimidazole type fluorescent whitening agents, metal chelate oxanoid compounds and styryl compounds. ### Claim 18 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the host material is an organic compound having at least one carbazolyl group. ### Claim 19 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the ultraviolet luminescent dopant is selected from the group consisting of ### Claim 20 (depends on 1) The blue organic electroluminescent device according to claim 1, wherein the visible luminescent dopant is a metal complex of Ir, Pt, Os, Pd or Au, wherein the host material is an organic compound having at least one carbazolyl group, and wherein the ultraviolet luminescent dopant is selected from the group consisting of