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CN-121974900-A - Organic electroluminescent compound and light-emitting device

CN121974900ACN 121974900 ACN121974900 ACN 121974900ACN-121974900-A

Abstract

The invention discloses an organic electroluminescent compound and a luminescent device, wherein in the structure of the organic electroluminescent compound, electron-rich groups formed by carbazole and phenyl connected with the carbazole are replaced by deuterium, and the electron-rich groups are matched with a P-type compound deuterated in a core region (HOMO electron distribution region), so that the chemical stability, the photoelectric stability and the thermal stability of the luminescent material structure can be effectively improved, the stability and the service life of the luminescent device using the material are further improved, meanwhile, the N-type compound can form a good Premix material with the P-type compound deuterated in the core region (HOMO electron distribution region), the P/N stability and the mass production stability are good in the evaporation process, and the formed Premix material has more balanced carrier mobility, and the efficiency and the service life of the device are greatly improved.

Inventors

  • XU JUN
  • WANG JIANJUN
  • GUO SHUAI
  • HUANG JUN

Assignees

  • 江苏高光新材料科技股份有限公司

Dates

Publication Date
20260505
Application Date
20250507

Claims (6)

  1. 1. An organic electroluminescent compound selected from any one of the following compounds:
  2. 2. An organic electroluminescent device comprising a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, wherein the organic layer comprises the organic electroluminescent compound according to claim 1.
  3. 3. An organic electroluminescent device as claimed in claim 2, wherein the organic layer comprises a hole injection layer, a first hole transport layer, a second hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer, the light emitting layer comprising the organic electroluminescent compound as claimed in claim 1.
  4. 4. An organic electroluminescent device as claimed in claim 3, wherein the light-emitting layer comprises a light-emitting host material composed of a first compound and a second compound, the first compound being the organic electroluminescent compound as claimed in claim 1, the second compound having a structure represented by the following formula (2-1) or formula (2-2): wherein: L 3 、L 4 、L 5 and L 6 each independently represent a single bond, or a deuterium-substituted or unsubstituted C6-C20 arylene group; Ar 3 、Ar 4 、Ar 5 and Ar 6 each independently represent a substituted or unsubstituted C6-C30 aryl group, or a substituted or unsubstituted C5-C30 heteroaryl group, ar 3 、Ar 4 、Ar 5 and Ar 6 each independently represent a substituent selected from deuterium, deuterated substituted or unsubstituted C6-C20 aryl group; R 12 and R 13 are deuterium, m1 is selected from integers from 0 to 3, m2 is selected from integers from 0 to 4, and n is selected from integers from 0 to 4.
  5. 5. The organic electroluminescent device of claim 4, wherein: L 3 、L 4 、L 5 and L 6 are each independently a single bond, phenylene or deuterated phenylene, ar 3 、Ar 4 、Ar 5 and Ar 6 are each independently a substituted or unsubstituted phenyl, biphenyl, naphthyl, anthryl, phenanthryl, benzophenanthryl or N-containing heteroaryl, and the substituents of Ar 3 、Ar 4 、Ar 5 and Ar 6 are selected from one or more of deuterium, phenyl and deuterated phenyl.
  6. 6. The organic electroluminescent device of claim 4, wherein the second compound is selected from any one of the following compounds:

Description

Organic electroluminescent compound and light-emitting device The invention is a divisional application of patent application with the application number of 202510579667.X and the application name of organic electroluminescent compounds and light-emitting devices aiming at 2025.05.07. Technical Field The invention belongs to the technical field of organic electroluminescence, and particularly relates to an organic electroluminescent compound and a luminescent device. Background The organic electroluminescent device generally includes a cathode, an anode, and an organic layer disposed therebetween, and when a voltage is applied between the two electrodes, holes are injected from the anode into the organic layer, electrons are injected from the cathode into the organic layer, excitons are formed when the holes and the electrons meet, and light is emitted when the excitons re-transition to a ground state. In recent years, deuterated light-emitting materials are often used in organic electroluminescent devices. Luminescent materials incorporating deuterium atoms in different ways may have different effects on the performance of the device. For example, deuteration does not occur at active sites of material molecules and sites with high electron density, which may cause that the stability of the material is not expected and the service life of the device is further affected, and the collocation between the luminescent main materials of the organic electroluminescent device is poor, which may cause that energy is not efficiently transferred to the doped material and the luminous efficiency is affected. Meanwhile, the inventor finds that the P/N ratio of the current green light main luminescent material has larger change along with the extension of evaporation time, so that the device performance fluctuation is larger, the stability is poorer, and the yield is lower. Disclosure of Invention The technical purpose of the invention is to develop an organic electroluminescent material with more excellent performance. In order to achieve the technical purpose, the invention provides the following technical scheme: an organic electroluminescent compound, characterized by having the structural formula (1): wherein: r 0-R7 each independently represents deuterium, a C6-C30 aryl substituted with deuterium or unsubstituted, provided that at least seven of R 0-R7 are deuterium; R 8-R11 each independently represents hydrogen, deuterium, a C6-C30 aryl substituted with deuterium or unsubstituted, provided that at least one of R 8-R11 is deuterium; l 1 and L 2 each independently represent a single bond; Ar 1 and Ar 2 are the same or different and represent a substituted or unsubstituted C6-C30 aryl group, provided that when any one of R 0-R11 is not a deuterium-substituted or unsubstituted C6-C30 aryl group, at least one of Ar 1 and Ar 2 is a substituted or unsubstituted biphenyl group, and the substituents of Ar 1 and Ar 2 are each independently selected from one or more of deuterium, cyano, C6-C20 aryl, deuterated C6-C20 aryl, C5-C20 heteroaryl, C1-C4 straight or branched alkyl, deuterated C1-C4 straight or branched alkyl, or a combination of more. Further, ar 1 and Ar 2 are the same or different and represent a phenyl group or a biphenyl group substituted or unsubstituted with a substituent, and the substituents of Ar 1 and Ar 2 are each independently selected from one or more of deuterium, methyl, phenyl, deuterated methyl, deuterated phenyl. Further, in the compound, in R 8-R11, R 8 or R 10 is C6-C30 aryl substituted by deuterium or unsubstituted, and at least one of the three remaining R groups is deuterium. Further, in the compound, seven R groups in R 0-R7 are deuterium, and another group other than deuterium is phenyl or deuterated phenyl. Preferably, the compounds of the present invention are selected from the following compounds: An organic electroluminescent device comprising a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, wherein the organic layer comprises the organic electroluminescent compound according to any one of the above. As a preferred embodiment, the organic layer includes a hole injection layer, a first hole transport layer, a second hole transport layer, a light emitting layer containing the organic electroluminescent compound as described above, a hole blocking layer, an electron transport layer, and an electron injection layer. Further, in the organic electroluminescent device, the light-emitting layer contains a light-emitting host material, the light-emitting host material is composed of a first compound and a second compound, the first compound is the organic electroluminescent compound according to any one of the above, and the structure of the second compound is represented by the following formula (2-1) or formula (2-2): wherein: L 3、L4、L5 and L 6 each independently represent a single bond, or a deuterium-substituted or unsu