# US 2014/0197389 A1 · Oled having multi-component emissive layer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197389 A1 - Document ID: US20140197389A1 - Status: Published application - Kind: A1 - Application number: 14/113,529 - Filed: 2011-05-27 - Published: 2014-07-17 - Earliest claimed: 2011-05-27 - Assignees: Universal Display Corporation - Inventors: Vadim Adamovich; Hitoshi Yamamoto; Michael S. Weaver; Chuanjun Xia - Web page: https://patentgrep.com/patent/US20140197389A1 ## CPC - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 50/121: {for assisting energy transfer, e.g. sensitization} - H10K 50/15: Hole transporting layers - H10K 50/16: Electron transporting layers - H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass - H10K 71/70: Testing, e.g. accelerated lifetime tests - H10K 85/324: {comprising aluminium, e.g. Alq3} - H10K 85/342: {comprising iridium} - H10K 85/622: {containing four rings, e.g. pyrene} - H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons} - H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene} - H10K 2101/10: Triplet emission - H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values - H10K 2102/103: {comprising indium oxides, e.g. ITO} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract Organic light-emitting devices having a multi-component organic electroluminescent layer. The organic electroluminescent layer comprises a phosphorescent dopant and a host material that is a mixture of at least three different compounds: a wide band gap host compound, an electron-transporting host compound, and a hole-transporting host compound. Use of such a multi-component organic electroluminescent layer may improve device efficiency and lifetime. ## Claims ### Claim 1 An organic light-emitting device comprising: an anode electrode; a cathode electrode; and an organic electroluminescent layer disposed between the anode electrode and the cathode electrode, the organic electroluminescent layer comprising a phosphorescent dopant and a host material comprising the following three different compounds: (a) an electron-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant; (b) a hole-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant; (c) a wide band gap host compound having a molecular weight of less than 2,000; wherein the wide band gap host compound has a band gap of at least 2.0 eV and a triplet energy that is greater than the triplet energy of the phosphorescent dopant. ### Claim 2 (depends on 1) The device of claim 1, wherein the wide band gap host compound has a band gap that is equal to or greater than the band gap of the hole-transporting host compound and the band gap of the electron-transporting host compound ### Claim 3 (depends on 1) The device of claim 1, wherein the LUMO energy level of the electron-transporting host compound is equal to or lower than the LUMO energy level of the hole-transporting host compound. ### Claim 4 (depends on 1) The device of claim 1, wherein the HOMO energy level of the hole-transporting host compound is equal to or higher than the HOMO energy level of the electron-transporting host compound. ### Claim 5 (depends on 1) The device of claim 1, wherein the wide band gap host compound is a small molecule. ### Claim 6 (depends on 1) The device of claim 1, wherein the hole-transporting host compound is a carbazole or triarylamine compound. ### Claim 7 (depends on 1) The device of claim 1, wherein the hole-transporting host compound is an organometallic complex. ### Claim 8 (depends on 7) The device of claim 7, wherein the organometallic complex is an iridium complex or zinc complex. ### Claim 9 (depends on 1) The device of claim 1, wherein the electron-transporting host compound is an oxadiazole, a benzimidazole, a triazole, a triazine, a benzothiazole, or a carbazole compound. ### Claim 10 (depends on 1) The device of claim 1, wherein the electron-transporting host compound is an organometallic complex. ### Claim 11 (depends on 1) The device of claim 1, wherein the organometallic complex is an aluminum complex, zinc complex, or beryllium complex. ### Claim 12 (depends on 1) The device of claim 1, further comprising a blocking layer that is between the electroluminescent layer and the cathode, the blocking layer comprising the electron-transporting host compound. ### Claim 13 (depends on 1) The device of claim 1, further comprising a hole injection layer that is between the electroluminescent layer and the anode, the hole injection layer comprising the hole-transporting host compound. ### Claim 14 (depends on 1) The device of claim 1, wherein the concentration of the wide band gap host compound is in the range of 10-60 wt %. ### Claim 15 (depends on 14) The device of claim 14, wherein the concentration of the electron-transporting host compound and the hole-transporting host compound are each in the range of 10-60 wt %. ### Claim 16 (depends on 15) The device of claim 15, wherein the concentration of the phosphorescent dopant is in the range of 0.5-10 wt %. ### Claim 17 (depends on 1) The device of claim 1, wherein the phosphorescent dopant is a sensitizer dopant and wherein the electroluminescent layer further comprises an emitter dopant, wherein the triplet energy of the emitter dopant is lower than the triplet energy of the sensitizer dopant. ### Claim 18 A method of making an organic light-emitting device, comprising: providing a first electrode; forming an organic electroluminescent layer over the first electrode, the organic electroluminescent layer comprising a phosphorescent dopant and a host material comprising the following three different compounds: (a) an electron-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant; (b) a hole-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant; (c) a wide band gap host compound having a molecular weight of less than 2,000; wherein the wide band gap host compound has a band gap of at least 2.0 eV and a triplet energy that is greater than the triplet energy of the phosphorescent dopant; forming a second electrode over the organic electroluminescent layer. ### Claim 19 (depends on 18) The method of claim 18, wherein the organic electroluminescent layer is formed by vacuum thermal evaporation of the host compounds. ### Claim 20 (depends on 19) The method of claim 19, wherein two or more of the electroluminescent layer compounds are pre-mixed prior to vacuum thermal evaporation. ### Claim 21 (depends on 18) The method of claim 18, wherein the hole-transporting host compound is an organometallic complex and the electron-transporting host compound is an oxadiazole, a benzimidazole, a triazole, a triazine, a benzothiazole, or a carbazole compound.