CN-117186081-B - Main body material and preparation method thereof, double main body material and organic electroluminescent device

Abstract

The invention provides a main body material, a preparation method thereof, a double main body material and an organic electroluminescent device, wherein the main body material is a compound shown in a structural formula II, and the organic electroluminescent device prepared from the main body material formed by the compound shown in the structural formula II has high luminous efficiency, low driving voltage and long service life.

Inventors

• WANG KANG
• MA XIAOYU
• XU JIANAN
• REN WEIHUA
• WANG TIE
• ZHANG XUE
• ZHANG SIMING

Assignees

• 吉林奥来德光电材料股份有限公司

Dates

Publication Date

20260512

Application Date

20230626

Claims (5)

1. 1. A host material selected from the group consisting of compounds of formula II; ; Wherein X 3 is selected from any one of O, S and-CR 1 R 2 -, R 1 and R 2 are each independently selected from C1-C10 alkyl; ar 3 and Ar 4 are each independently selected from any one of the groups represented by the following structural formulae: ; has The group of (2) represents N as a connecting position, and any position of other groups is used as a connecting position on the basis of meeting the rule of chemical bonds.
2. 2. The host material of claim 1, wherein R 1 and R 2 are each independently selected from unsubstituted C1-C5 alkyl.
3. 3. The host material of claim 1 or 2, wherein the compound of formula II is selected from any one of the following compounds: 。
4. 4. A process for the preparation of a host material according to any one of claims 1 to 3, wherein the compound of formula II is prepared according to the following synthetic route: R' is Or (b) Hal 2 is selected from any one of Cl, br and I.
5. 5. An organic electroluminescent device, characterized in that the light emitting device comprises the host material according to any one of claims 1-3.

Description

Main body material and preparation method thereof, double main body material and organic electroluminescent device The application relates to a divisional application of a patent application with the application number 202310754752.6 (the application date of the original application is 2023, 6 and 26, the application name is a main body material, a preparation method thereof, a double main body material and an organic electroluminescent device), which is applied to the divisional application. Technical Field The invention relates to the technical field of organic luminescent materials, in particular to a main body material and a preparation method thereof, a double main body material and an organic electroluminescent device. Background An organic electroluminescent display (OLED) is an active light emitting display device. At present, an OLED display screen with a medium and small size has been applied to high-end smart phones manufactured by companies such as Hua Cheng, xiao Ji, sanxing and the like in a large scale, and obtaining the optimal luminous efficiency of a device under the condition of low working voltage is a general requirement in the OLED field. The reasonable device structure can effectively improve the performance of the device, and the organic electroluminescent device is generally a multi-layer structure and generally comprises an electron injection layer, an electron transport layer, a hole blocking layer, a luminescent layer, an electron blocking layer, a hole transport layer, a hole injection layer and the like, and is widely used for improving the performance of the device. Holes from the anode and electrons from the cathode are injected into the light emitting layer by applying a voltage, and excitons having high energy are generated by recombination of the holes and electrons. The organic light emitting compound moves to an excited state by energy and emits light by the energy when the organic light emitting compound returns from the excited state to a ground state. Factors affecting the efficiency and lifetime of an organic electroluminescent device include i) whether electrons and holes in the light emitting layer are balanced, and ii) whether the emission regions in the light emitting layer are widely and uniformly distributed in the light emitting layer, instead of focusing on the hole transporting layer or the electron transporting layer. Further development of organic electroluminescent devices having low voltage, high efficiency and long lifetime is a problem to be solved by those skilled in the art. In particular, the performance of the organic electroluminescent device is improved by improving the material forming the light emitting layer. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a main body material, a preparation method thereof, a double main body material and an organic electroluminescent device. The double-main-body material formed by the compound with the specific structure provided by the embodiment of the invention can greatly improve the performance of the organic electroluminescent device, and particularly reduces the low driving voltage, high efficiency and long service life of the organic electroluminescent device. The invention is realized in the following way: in a first aspect, the present invention provides a host material comprising a compound of formula I, Wherein, X 1 and X 2 are respectively and independently selected from O or N, and X 1 and X 2 are not N or O at the same time; r is selected from any one of substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C6-C24 aryl and substituted or unsubstituted 3-to 24-membered heteroaryl; l 1 is selected from any one of a bond, a substituted or unsubstituted C6-C24 aryl, and a substituted or unsubstituted 3-to 24-membered heteroaryl; Ar 1 and Ar 2 are each independently selected from any one independently selected from substituted or unsubstituted C6-C24 aryl and substituted or unsubstituted 3-to 24-membered heteroaryl, or Ar 1 and Ar 2 may be linked to form a ring. In a second aspect, the present invention provides a method for preparing a host material according to the foregoing embodiment, comprising preparing the compound represented by formula I by referring to the following synthetic route: when L 1 is not a connecting bond, the subsequent synthetic route is as follows: When L 1 is a connecting bond, the subsequent synthetic route is as follows: wherein Hal1 is selected from Cl or Br, hal is selected from any one of Cl, br and I, R' is In a third aspect, the present invention provides a dual-host material, which is composed of a first host material and a second host material, wherein the first host material is selected from the compounds shown in the structural formula I, and the second host material is selected from the compounds shown in the structural formula II; wherein X 3 is selected from any one of O, S and-CR 1R2