# US 2006/0232194 A1 · Hybrid OLED having phosphorescent and fluorescent emitters > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0232194 A1 - Document ID: US20060232194A1 - Status: Published application - Kind: A1 - Application number: 11/105,666 - Filed: 2005-04-13 - Published: 2006-10-19 - Earliest claimed: 2005-04-13 - Assignees: Universal Display Corporation - Inventors: Yeh-Jiun Tung; Michael Weaver; Michael Hack; James Esler - Web page: https://patentgrep.com/patent/US20060232194A1 ## CPC - H10K 50/131: {with spacer layers between the electroluminescent layers} - 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 50/13: comprising stacked EL layers within one EL unit - H10K 50/15: Hole transporting layers - H10K 50/19: Tandem OLEDs - H10K 85/622: {containing four rings, e.g. pyrene} - H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene} - C09K 2211/1011: Condensed systems - H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths - H10K 85/324: {comprising aluminium, e.g. Alq3} - H10K 85/342: {comprising iridium} - H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene} - H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom} - H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons} - H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole} - H10K 2101/10: Triplet emission - H10K 2101/27: {Combination of fluorescent and phosphorescent emission} - H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values - H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers - H10K 2102/351: {Thickness} - 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 ## Abstract The present invention provides organic light emitting devices having a combined emission from at least two emissive materials, a fluorescent blue emissive material and a phosphorescent emissive material. The device may further comprise additional fluorescent or phosphorescent emissive materials. In preferred embodiments, the invention provides OLEDs having three different emissive materials—a red emissive material, a green emissive material and a blue emissive material. The invention provides a device architecture which is optimized for efficiency and lifetime by using a combination of fluorescent and phosphorescent emitters. Further, in preferred embodiments the device architecture provides a high color-stability of the light emission over a wide range of currents or luminances. ## Claims ### Claim 1 An organic light emitting device comprising: a cathode a first emissive layer comprising a fluorescent blue emitting material as a dopant in a host material; a second emissive layer comprising a phosphorescent emitting material as a dopant in a host material; and an anode wherein, a combined emission of the emitting materials gives a white emission from the device. ### Claim 2 (depends on 1) The organic light emitting device of claim 1, wherein the blue emitting material is a blue emitting arylpyrene. ### Claim 3 (depends on 1) The organic light emitting device of claim 1, wherein the blue emitting material is 1,3,6,8-tetra(2-naphthyl)pyrene. ### Claim 4 (depends on 1) The organic light emitting device of claim 1, wherein the blue emitting material is a blue emitting arylenevinylene compound. ### Claim 5 (depends on 1) The organic light emitting device of claim 1, wherein the device further comprises a separate non-emitting hole transporting layer. ### Claim 6 (depends on 1) The organic light emitting device of claim 1, wherein the device further comprises a spacer layer between the first emissive layer and the second emissive layer. ### Claim 7 (depends on 1) The organic light emitting device of claim 1, wherein the second emissive layer comprises a phosphorescent green emitting material and a phosphorescent red emitting material. ### Claim 8 (depends on 1) The organic light emitting device of claim 1, wherein the emissive region comprises: a first emissive layer comprising the fluorescent blue emitting material; a second emissive layer comprising a phosphorescent green emitting material; and a third emissive layer comprising a phosphorescent red emitting material. ### Claim 9 (depends on 1) The organic light emitting device of claim 1, wherein the emissive region comprises: a first emissive layer comprising the fluorescent blue emitting material and a fluorescent green emitting material; and a second emissive layer comprising a phosphorescent red emitting material. ### Claim 10 (depends on 1) The organic light emitting device of claim 1, wherein the device emits light having CIE coordinates of X=0.37±0.07, and Y=0.37±0.07. ### Claim 11 (depends on 1) The organic light emitting device of claim 1, wherein the device has a maximum external quantum efficiency of at least about 5.0%. ### Claim 12 (depends on 1) The organic light emitting device of claim 1, wherein the device has a maximum external quantum efficiency of at least about 6.0%. ### Claim 13 An organic light emitting device comprising in order: a cathode a first emissive layer comprising a fluorescent emitting material; a second emissive layer comprising a phosphorescent emitting material; and an anode wherein, when a voltage is applied across the device light is emitted from the emitting materials. ### Claim 14 (depends on 13) The organic light emitting device of claim 13, wherein the first emissive layer comprises a host material and the fluorescent emitting material as a dopant in the host material. ### Claim 15 (depends on 14) The organic light emitting device of claim 14, wherein the fluorescent emitting material is a blue emitting material. ### Claim 16 (depends on 15) The organic light emitting device of claim 15, wherein the fluorescent emitting material is a blue emitting arylpyrene. ### Claim 17 (depends on 16) The organic light emitting device of claim 16, wherein the blue emitting material is 1,3,6,8-tetra(2-naphthyl)pyrene. ### Claim 18 (depends on 13) The organic light emitting device of claim 13, wherein the blue emitting material is a blue emitting arylenevinylene compound. ### Claim 19 (depends on 13) The organic light emitting device of claim 13, wherein the device further comprises a spacer layer between the first emissive layer and the second emissive layer. ### Claim 20 (depends on 13) The organic light emitting device of claim 13, wherein the second emissive layer comprises a phosphorescent green emitting material and a phosphorescent red emitting material. ### Claim 21 (depends on 13) The organic light emitting device of claim 13, wherein the emissive region comprises: a first emissive layer comprising the fluorescent blue emitting material; a second emissive layer comprising a phosphorescent green emitting material; and a third emissive layer comprising a phosphorescent red emitting material. ### Claim 22 (depends on 13) The organic light emitting device of claim 13, wherein the emissive region comprises: a first emissive layer comprising the fluorescent blue emitting material and a fluorescent green emitting material; and a second emissive layer comprising a phosphorescent red emitting material. ### Claim 23 (depends on 13) The organic light emitting device of claim 13, wherein a combined emission of the emitting materials gives a white emission from the device. ### Claim 24 (depends on 23) The organic light emitting device of claim 23, wherein the device emits light having CE coordinates of X=0.37±0.07, and Y=0.37±0.07. ### Claim 25 (depends on 13) The organic light emitting device of claim 13, wherein the device has a maximum external quantum efficiency of at least about 5.0%. ### Claim 26 (depends on 13) The organic light emitting device of claim 13, wherein the device has a maximum external quantum efficiency of at least about 6.0%.