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CN-121991106-A - Polycyclic aromatic compound and organic electroluminescent device

CN121991106ACN 121991106 ACN121991106 ACN 121991106ACN-121991106-A

Abstract

The present disclosure provides a polycyclic aromatic compound and an organic electroluminescent device, which belong to the technical field of display. The polycyclic aromatic compound is shown in chemical formula 1, which can improve the performance of the organic electroluminescent device.

Inventors

  • ZHANG YUNXI

Assignees

  • 京东方科技集团股份有限公司
  • 成都京东方光电科技有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (12)

  1. 1. A polycyclic aromatic compound, characterized in that the structural formula of the polycyclic aromatic compound is shown in chemical formula (1): In the chemical formula (1): The A ring and the B ring are each independently selected from a substituted or unsubstituted fused ring having at least one aromatic ring, a substituted or unsubstituted fused ring having at least one heteroaromatic ring; X 1 and X 2 are each independently selected from NR or O, R is selected from substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted alkyl; Y 1 is selected from one of B, P, P =o or p=s; R 1 、R 10 、R 11 and R 20 are each independently selected from hydrogen, deuterium, halogen, alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted alkyl having 1 to 4 carbon atoms, heterocycloalkyl having 1 to 4 carbon atoms, aryl having 6 to 12 carbon atoms, and heteroaryl having 2 to 15 carbon atoms; R 21 ～R 23 is each independently selected from hydrogen, deuterium, cyano, alkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl.
  2. 2. The polycyclic aromatic compound according to claim 1, wherein the polycyclic aromatic compound is represented by formula (1A): in the chemical formula (1A): z 1 and Z 2 are each independently carbonyl or a single bond; R 2 ～R 9 、R 12 ～R 19 is independently selected from hydrogen, deuterium, halogen, alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted alkyl having 1 to 4 carbon atoms, heterocycloalkyl having 1 to 4 carbon atoms, aryl having 6 to 12 carbon atoms, and heteroaryl having 2 to 15 carbon atoms.
  3. 3. The polycyclic aromatic compound according to claim 1, wherein the polycyclic aromatic compound is represented by formula (1B): In the chemical formula (1B): R 1' ～R 5' and R 8' ～R 12' are each independently selected from hydrogen, deuterium, halogen, alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted alkyl having 1 to 4 carbon atoms, heterocycloalkyl having 1 to 4 carbon atoms, aryl having 6 to 12 carbon atoms, and heteroaryl having 2 to 15 carbon atoms; R 6' and R 7' are each independently selected from alkyl groups having 1 to 4 carbon atoms, cycloalkyl groups, substituted or unsubstituted aryl groups having 6 to 12 carbon atoms, and R 6' and R 7' which are bonded to the same carbon atom may be bonded to each other to form a 5-to 10-membered aliphatic ring with the commonly bonded carbon atoms.
  4. 4. The polycyclic aromatic compound according to claim 1, wherein the polycyclic aromatic compound is represented by formula (1C): in the chemical formula (1C): R a 、R b is independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted alkyl having 1 to 4 carbon atoms, heterocycloalkyl having 1 to 4 carbon atoms, aryl having 6 to 12 carbon atoms, and heteroaryl having 2 to 15 carbon atoms; E 1 、E 2 is independently selected from C (R c ) 2 , substituted or unsubstituted phenylene, R c is selected from hydrogen, deuterium, methyl, ethyl, propyl, phenyl, biphenyl and naphthyl, or two R c are mutually connected to form a saturated aliphatic ring with 5-10 carbon atoms, and when two R c are not mutually connected, two R c are the same or different.
  5. 5. The polycyclic aromatic compound according to claim 4, wherein R a 、R b is independently selected from the group consisting of hydrogen, deuterium, t-butyl, fluorine, trifluoromethyl, methoxy, phenoxy; C (two R c of R c ) 2 are each independently selected from methyl, phenyl, or two R c are linked to each other such that C (R c ) 2 forms a cyclopentylalkyl group).
  6. 6. The polycyclic aromatic compound according to any one of claims 1 to 5, wherein X 1 and X 2 are each NR, R is selected from a substituted or unsubstituted aryl group having 6 to 18 ring-forming carbon atoms, when R is a substituted aryl group, the substituent on the substituted aryl group is selected from deuterium, methyl, t-butyl, phenyl, and when the number of substituents on the substituted aryl group is two or more, any two substituents are the same or different.
  7. 7. The polycyclic aromatic compound according to any one of claims 1-5, wherein Y 1 is B.
  8. 8. The polycyclic aromatic compound according to any one of claims 1 to 5, wherein each R 21 ～R 23 is independently selected from the group consisting of hydrogen, deuterium, diphenylamino, N-carbazolyl, one or more tert-butyl substituted N-carbazolyl, and at least two of R 21 ～R 23 are selected from the group consisting of hydrogen and deuterium.
  9. 9. The polycyclic aromatic compound according to any one of claims 1-5, wherein the polycyclic aromatic compound is selected from the group consisting of:
  10. 10. An organic electroluminescent device is characterized by comprising an anode, an organic luminescent layer and a cathode which are sequentially stacked, wherein the organic luminescent layer comprises a main body material and a doping material, and the doping material is the polycyclic aromatic compound according to any one of claims 1-9.
  11. 11. The organic electroluminescent device according to claim 10, wherein the mass content of the doping material in the organic luminescent layer is between 1% and 30%.
  12. 12. The organic electroluminescent device according to claim 10, wherein the organic luminescent layer further comprises a thermally activated delayed fluorescence material as a sensitizer, and wherein the mass content of the sensitizer in the organic luminescent layer is not higher than 30%.

Description

Polycyclic aromatic compound and organic electroluminescent device Technical Field The disclosure relates to the technical field of display, in particular to a polycyclic aromatic compound and an organic electroluminescent device. Background An OLED (organic electroluminescent device) is an electroluminescent device, which is widely used in the fields of solid-state lighting and display because of its advantages of self-luminescence, high resolution, low power consumption, high color saturation, wide color gamut, fast screen response speed, and flexibility. The rapid popularization of OLEDs, the great demands of the market, and the rapid update and iteration of electronic products have driven the research and development of functional materials, including hole injection materials, hole transport materials, hole blocking materials, light-emitting host materials, light-emitting dopants, electron blocking materials, electron transport materials, and electron injection materials, and the like, in an effort to improve the device performance such as the OLED light-emitting efficiency, driving voltage, lifetime, and color purity. The traditional fluorescent material only can emit light by utilizing singlet excitons, the cost is low but the efficiency is low, the phosphorescent material can obtain a high-efficiency electroluminescent device by relying on the heavy atomic effect of rare metals, but the preparation cost of the material is high, and the stability of the phosphorescent OLED is poor, the service life of a blue light device is short and the application is limited due to the long service life of T 1 (first triplet state) excitons. The T 1 exciton of TADF (thermally activated delayed fluorescence) material can realize the up-conversion between the opposite systems into S 1 (first singlet) exciton by absorbing the ambient heat when the delta E ST (difference between the first singlet and the first triplet) is lower than 0.3eV, and then fluorescence is emitted, so that the advantages of 100% internal quantum efficiency, relatively low cost and the like are paid attention since the advent of the prior art. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of Invention The present disclosure aims to overcome the above-mentioned shortcomings of the prior art, and provide a polycyclic aromatic compound and an organic electroluminescent device, which improve the performance of the organic electroluminescent device. According to one aspect of the present disclosure, there is provided a polycyclic aromatic compound having a structural formula as shown in chemical formula (1): In the chemical formula (1): The A ring and the B ring are each independently selected from a substituted or unsubstituted fused ring having at least one aromatic ring, a substituted or unsubstituted fused ring having at least one heteroaromatic ring; X 1 and X 2 are each independently selected from NR or O, R is selected from substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted alkyl; Y 1 is selected from one of B, P, P =o or p=s; R 1、R10、R11 and R 20 are each independently selected from hydrogen, deuterium, halogen, alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted alkyl having 1 to 4 carbon atoms, heterocycloalkyl having 1 to 4 carbon atoms, aryl having 6 to 12 carbon atoms, and heteroaryl having 2 to 15 carbon atoms; R 21～R23 is each independently selected from hydrogen, deuterium, cyano, alkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl. According to another aspect of the disclosure, an organic electroluminescent device is provided, which includes an anode, an organic light emitting layer, and a cathode that are sequentially stacked, wherein the organic light emitting layer includes a host material and a doping material, and the doping material is the polycyclic aromatic compound. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort. Fig. 1 is a schematic structural view of an organic electroluminescent device according to an embodiment of the present disclosure. Detailed Description Example embodiments will now be descr