# US 2019/0173036 A1 · Organic light emitting diode, oled display substrate 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 2019/0173036 A1 - Document ID: US20190173036A1 - Status: Published application - Kind: A1 - Application number: 16/323,518 - Filed: 2018-05-24 - Published: 2019-06-06 - Earliest claimed: 2017-05-27 - Assignees: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Yue HU; Minghung HSU; Chinlung LIAO; Lifang SONG; Zhaokang FAN - Web page: https://patentgrep.com/patent/US20190173036A1 ## CPC - H10K 71/135: {using ink-jet printing} - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light - H10K 50/13: comprising stacked EL layers within one EL unit - H10K 50/14: Carrier transporting layers - H10K 50/15: Hole transporting layers - H10K 50/16: Electron transporting layers - H10K 50/171: {Electron injection layers} - H10K 50/19: Tandem OLEDs - H10K 59/30: Devices specially adapted for multicolour light emission - H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths - H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom} - H10K 59/10: OLED displays - H10K 2101/10: Triplet emission - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract The present disclosure relates to the field of display technology and provides an organic light emitting diode, an OLED display substrate and a display device. It can solve the problem of low continuity in inkjet printing and complicated computer programs between different materials of light emitting layers in the existing organic light emitting diodes. The organic light emitting diode includes a cathode, an anode, and a functional layer between the cathode and the anode; wherein the functional layer includes a first light emitting layer and a second light emitting layer disposed in sequence in a direction away from the anode; the first light emitting layer comprises a first material emitting blue light; and the first light emitting layer and the second light emitting layer form an aggregate in excited state for emitting light of a color different from blue after the cathode and the anode are connected. ## Claims ### Claim 1 An organic light emitting diode, including a cathode, an anode, and a functional layer between the cathode and the anode; wherein the functional layer includes a first light emitting layer and a second light emitting layer disposed in sequence in a direction away from the anode; the first light emitting layer comprises a first material emitting blue light; and the first light emitting layer and the second light emitting layer form an aggregate in excited state for emitting light of a color different from blue after the cathode and the anode are connected. ### Claim 2 (depends on 1) The organic light emitting diode according to claim 1, characterized in that the second light emitting layer includes a second material emitting blue light, the first light emitting layer and the second light emitting layer form an excimer emitting red light after the cathode and the anode are connected. ### Claim 3 (depends on 2) The organic light emitting diode according to claim 2, characterized in that the first material emitting blue light and the second material emitting blue light are the same. ### Claim 4 (depends on 3) The organic light emitting diode according to claim 3, characterized in that the first material emitting blue light and the second material emitting blue light include an aromatic compound having a benzene ring and two molecules in ground state of the aromatic compound form a face-to-face configuration. ### Claim 5 (depends on 4) The organic light emitting diode according to claim 4, characterized in that the first material emitting blue light and the second material emitting blue light include one of a pyrene, an alkylbenzene compound, and a 2,w-alkylpyrene. ### Claim 6 (depends on 2) The organic light emitting diode according to claim 2, characterized in that the organic light emitting diode further includes a hole injection layer and a hole transport layer disposed in sequence between the anode and the first light emitting layer, and a hole blocking layer, an electron transport layer, and an electron injection layer disposed in sequence between the second light emitting layer and the cathode. ### Claim 7 (depends on 1) The organic light emitting diode according to claim 1, characterized in that the second light emitting layer includes an electron transport material, and the first light emitting layer and the second light emitting layer form an exciplex emitting green light after the cathode and the anode are connected. ### Claim 8 (depends on 7) The organic light emitting diode according to claim 7, characterized in that the exciplex has an energy level satisfying hv=I(D)−E(A)−C, wherein I(D) is a ionization potential of a donor, E(A) is an electron affinity potential of a acceptor, and C is a coulomb energy of the exciplex. ### Claim 9 (depends on 7) The organic light emitting diode according to claim 7, characterized in that the organic light emitting diode further includes a hole injection layer and a hole transport layer disposed in sequence between the anode and the first light emitting layer, and an electron injection layer between the second light emitting layer and the cathode. ### Claim 10 (depends on 1) An OLED display substrate, including the organic light emitting diode according to claim 1. ### Claim 11 (depends on 10) The OLED display substrate according to claim 10, characterized in that the organic light emitting diode includes a red organic light emitting diode, a green organic light emitting diode, and a blue organic light emitting diode; and the first light emitting layer and the second light emitting layer of the red organic light emitting diode, the first light emitting layer of the green organic light emitting diode, and the light emitting layer of the blue organic light emitting diode are made of the same material emitting blue light. ### Claim 12 (depends on 10) A display device, characterized in that the display device includes the OLED display substrate according to claim 10.