CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Chinese Patent Application No. CN 201811581250.3, filed on Dec. 24, 2018, the content of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of organic electroluminescent materials, and in particular, to a novel organic compound containing anthryl and phenanthrolinyl group, and a display panel containing the organic compound and a display apparatus including the display panel.

BACKGROUND

For the commercial and practical applications of electroluminescent devices, it is desirable to obtain electronic transmission materials with higher transmission efficiency and better application performance. Researchers have made exploratory efforts in this field. The electron transmission material used in a conventional electroluminescent device is Alq3 (8-hydroxyquinoline aluminum), but the electron mobility of Alq3 is relatively low (about 10−6cm2/Vs), which causes imbalance of the electron transmission and hole transmission of the device.

At present, the commonly used electron transmission materials, such as batho-phenanthroline (BPhen), bathocuproine (BCP), and TmPyPB (1,3,5-tri[(3-pyridyl)-3)-phenyl]benzene)), basically meet the market's demands for organic electroluminescent panels, but their glass transition temperature is low (generally less than 85° C.). The Joule heat generated during the operation of the devices using such materials may lead to molecular degradation and molecular structure changes, which results in low efficiency and poor thermal stability of the devices. Meanwhile, these materials have symmetric and regular molecular structures and thus easily crystallize after a long time. Once the electron transmission material crystallizes, the charge transition mechanism of the crystallized molecules will be different from the amorphous film mechanism of these molecules during the normal operation, resulting in deterioration in the performance of electron transmission and an imbalance between electron mobility and hole mobility of the whole device. In addition, the exciton formation efficiency is greatly reduced, and the excitons enrich at the interface between the electron transmission layer and the light-emitting layer, resulting in a significant drop in device efficiency and lifetime.

SUMMARY

The present disclosure is to provide a novel organic compound containing anthryl and phenanthrolinyl, and a display panel containing the organic compound and a display apparatus including the display panel. The organic compound can be used as a stable and efficient electron transmission material and/or electron injection material, can simultaneously have high electron mobility and high glass transition temperature, and can be effectively doped, which can reduce the threshold voltage, improve device efficiency, and extend service life of the device. Therefore, the compound of the present disclosure has an important practical application value.

In an aspect, the present disclosure provides organic compound, having a structure represented by Chemical Formula 1:



wherein R1to R8are each independently selected from hydrogen, substituted or unsubstituted C6-C18 aryl, substituted or unsubstituted pyridyl, substituted or unsubstituted quinolyl, substituted or unsubstituted C1-C16 alkyl, substituted or unsubstituted C1-C16 alkoxy, hydroxyl, and carboxyl;

m, n, x and y each independently represent 0 or 1, where m+x≥1, n+y≥1, m+n≥1, and x+y≥1;

L1and L2are each independently selected from substituted or unsubstituted C6-C30 arylene, substituted or unsubstituted C5-C30 heteroarylene, substituted or unsubstituted C1-C8 alkylene, and substituted or unsubstituted C1-C8 alkyleneoxy; and

Ar1 and Ar2 each independently have a structure shown in Chemical Formula 2:



wherein R21to R27are each independently selected from hydrogen, substituted or unsubstituted C6-C18 aryl, substituted or unsubstituted pyridyl, substituted or unsubstituted quinolyl, substituted or unsubstituted C1-C16 alkyl, substituted or unsubstituted C1-C16 alkoxy, hydroxyl, and carboxyl; and # indicates a bonding position where the Chemical Formula 2 is bonded to the Chemical Formula 1.

In another aspect, the present disclosure provides a display panel including an organic electroluminescent device, wherein the organic electroluminescent device comprises a substrate, an anode, a cathode arranged opposite to the anode, a first capping layer located at a side of the cathode facing away from the anode, and organic functional layers located between the anode and the cathode, wherein the organic functional layers comprise an electron injection layer, an electron transmission layer, a light-emitting layer, a hole transmission layer, and a second capping layer, and at least one of the electron injection layer, the electron transmission layer, or the light-emitting layer contains the organic compound as described above.

In still another aspect, the present disclosure provides a display apparatus including the above-mentioned display panel.

