# US 2018/0026219 A1 · Organic light emitting element, display panel and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026219 A1 - Document ID: US20180026219A1 - Status: Published application - Kind: A1 - Application number: 15/459,119 - Filed: 2017-03-15 - Published: 2018-01-25 - Earliest claimed: 2016-07-22 - Assignees: EverDisplay Optronics (Shanghai) Limited - Applicants: EverDisplay Optronics (Shanghai) Limited - Inventors: Yanhu LI; Xin MOU - Web page: https://patentgrep.com/patent/US20180026219A1 ## CPC - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 50/13: comprising stacked EL layers within one EL unit - 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 59/12: Active-matrix OLED [AMOLED] displays - H10K 85/636: {comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom} - H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole} - 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: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract The present disclosure relates to an organic element, a display panel and a display device. The organic light emitting element includes: a first electrode; a hole layer disposed on the first electrode; a light emitting layer including a first light emitting portion, a second light emitting portion and a third light emitting portion; an electron layer on the light emitting layer; and a second electrode disposed on the electron layer. An energy level difference between the hole layer and the first light emitting portion and/or an energy level difference between the first light emitting portion and the electron layer is greater than or equal to a first threshold, so that a turn-on voltage difference between the first light emitting portion and the second light emitting portion is smaller than a second threshold. ## Claims ### Claim 1 An organic light emitting element, comprising: a first electrode; a hole layer disposed on the first electrode; a light emitting layer disposed on the hole layer and comprising a first light emitting portion, a second light emitting portion and a third light emitting portion; an electron layer disposed on the light emitting layer; and a second electrode disposed on the electron layer; wherein a difference of an energy level between that of the hole layer and the first light emitting portion and/or a difference of an energy level between that of the first light emitting portion and the electron layer is greater than or equal to a first threshold, so that a difference of a turn-on voltage between that of the first light emitting portion and the second light emitting portion is smaller than a second threshold. ### Claim 2 (depends on 1) The organic light emitting element according to claim 1, wherein the first light emitting portion, the second light emitting portion and the third light emitting portion emit different colors. ### Claim 3 (depends on 1) The organic light emitting element according to claim 1, wherein the difference of the energy level between that of the hole layer and the first light emitting portion is a difference of an energy level of a highest occupied molecular orbital between that of the hole layer and the first light emitting portion. ### Claim 4 (depends on 1) The organic light emitting element according to claim 1, wherein the difference of the energy level between that of the first light emitting portion and the electron layer is a difference of an energy level of a lowest unoccupied molecular orbital between that of the first light emitting portion and the electron layer. ### Claim 5 (depends on 1) The organic light emitting element according to claim 1, wherein the hole layer comprises: a hole injection layer disposed on the first electrode; and a hole transporting layer disposed between the hole injection layer and the light emitting layer. ### Claim 6 (depends on 5) The organic light emitting element according to claim 5, wherein the difference of the energy level between that of the hole layer and the first light emitting portion is a difference of energy level between that of the hole transporting layer and the first light emitting portion. ### Claim 7 (depends on 1) The organic light emitting element according to claim 1, wherein the electron layer comprises: an electron injection layer disposed on the light emitting layer; and an electron transporting layer disposed between the electron injection layer and the second electrode. ### Claim 8 (depends on 7) The organic light emitting element according to claim 7, wherein the difference of the energy level between that of the first light emitting portion and the electron layer is a difference of an energy level between that of the first light emitting portion and the electron transporting layer. ### Claim 9 (depends on 1) The organic light emitting element according to claim 1, wherein the electron layer is formed by 4,7-diphenyl-1,10-phenanthroline or 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene; or the hole layer is formed by 4,4′,4″-tris(carbazol-9-yl)-triphenylamine, or N,N-diphenyl-N,N-[(1-naphthalenyl)- 1,1′-biphenyl-4,4-diamine (NPD); or the first light emitting portion is formed by 1,3-bis(carbazol)-9-yl-benzene or 10-hydroxybenzo[H]quinolone. ### Claim 10 (depends on 1) The organic light emitting element according to claim 1, wherein the first threshold is from 0.2 eV to 0.4 eV. ### Claim 11 (depends on 1) The organic light emitting element according to claim 1, wherein an electron mobility of the first light emitting portion is smaller than an electron mobility of the second light emitting portion. ### Claim 12 (depends on 11) The organic light emitting element according to claim 11, wherein the electron mobility of the first light emitting portion is smaller than 10−3 cm2/Vs. ### Claim 13 (depends on 1) The organic light emitting element according to claim 1, wherein the second threshold is from 0.4V to 0.6V. ### Claim 14 (depends on 1) The organic light emitting element according to claim 1, wherein a difference of an energy level between that of the hole layer and the third light emitting portion and/or a difference of an energy level between that of the third light emitting portion and the electron layer is greater than or equal to a third threshold, so that a difference of the turn-on voltage between that of the second light emitting portion and the third light emitting portion is smaller than a fourth threshold. ### Claim 15 (depends on 14) The organic light emitting element according to claim 14, wherein the third threshold is from 0.2 eV to 0.4 eV. ### Claim 16 (depends on 14) The organic light emitting element according to claim 14, wherein an electron mobility of the third light emitting device is smaller than the electron mobility of the second light emitting portion. ### Claim 17 (depends on 16) The organic light emitting element according to claim 16, wherein the electron mobility of the third light emitting portion is smaller than 10−3 cm2/Vs. ### Claim 18 (depends on 14) The organic light emitting element according to claim 14, wherein the fourth threshold is from 0.4V to 0.6V. ### Claim 19 A display panel, comprising an organic light emitting element; wherein the organic light emitting element comprises: a first electrode; a hole layer disposed on the first electrode; a light emitting layer disposed on the hole layer and comprising a first light emitting portion, a second light emitting portion and a third light emitting portion; an electron layer disposed on the light emitting layer; and a second electrode disposed on the electron layer; wherein a difference of an energy level between that of the hole layer and the first light emitting portion and/or a difference of an energy level between that of the first light emitting portion and the electron layer is greater than or equal to a first threshold, so that a difference of a turn-on voltage between that of the first light emitting portion and the second light emitting portion is smaller than a second threshold. ### Claim 20 A display device, comprising a display panel comprising an organic light emitting element; wherein the organic light emitting element comprises: a first electrode; a hole layer disposed on the first electrode; a light emitting layer disposed on the hole layer and comprising a first light emitting portion, a second light emitting portion and a third light emitting portion; an electron layer disposed on the light emitting layer; and a second electrode disposed on the electron layer; wherein a difference of an energy level between that of the hole layer and the first light emitting portion and/or a difference of an energy level between that of the first light emitting portion and the electron layer is greater than or equal to a first threshold, so that a difference of a turn-on voltage between that of the first light emitting portion and the second light emitting portion is smaller than a second threshold.