Organic electroluminescent device including hole blocking layer and electron transport layer

Abstract

The invention discloses an organic electroluminescent device including a hole blocking layer and an electron transport layer. The device comprises an anode, a cathode and an organic layer arranged between the anode and the cathode, wherein the organic layer at least comprises a first organic layer and a second organic layer, and both the first organic layer and the second organic layer comprise compounds of specific structures. By selecting a special combination of the hole blocking layer and the electron transport layer containing a specific structural material, the concentration of carriersin the light-emitting layer is effectively regulated and controlled to reach expected balance, and compared with the prior art, the comprehensive performance of the organic light-emitting device is obviously improved. A display assembly is also disclosed.

Description

technical field [0001] The present invention relates to an organic electronic device. More particularly, it relates to organic electroluminescent devices comprising a hole-blocking layer and an electron-transporting layer. Background technique [0002] Organic electronic devices include but are not limited to the following categories: organic light-emitting devices (OLEDs), organic field-effect transistors (O-FETs), organic light-emitting transistors (OLETs), organic photovoltaic devices (OPVs), dye-sensitized solar cells (DSSCs) , organic optical detectors, organic photoreceptors, organic field-effect devices (OFQDs), light-emitting electrochemical cells (LECs), organic laser diodes, and organic plasmonic light-emitting devices. [0003] Organic light-emitting devices have advantages such as wide angle, high contrast ratio and faster response time. Tang and Van Slyke of Eastman Kodak Company reported an organic light-emitting device in 1987, arylamine hole transport layer...

AI Technical Summary

Problems solved by technology

[0006] U.S. patent application US20190067591A1 discloses a series of compounds with a nitrogen heterocyclic structure such as triazine as the basic skeleton that can be used as hole blocking materials. The matching of electron transport materials with the ring as the basic skeleton, but the coordination of this type of compound as a hole blocking material with other specific structure types, especially electron transport materials containing silicon heterocycles, has not been studied

[0007] Chinese patent application CN 109671851 A discloses a series of carbazole compounds that can be used as hole blocking materials, but this application only studies the combined use of such compounds and three common electron transport materials, and does not study the carbazole compounds Coordination of Compounds as Hole-blocking Materials and Electron-Transporting Materials with Specific Structures

Although the application discloses a series of organic compounds that can be used as hole-blocking layer materials, the application does not pay attention to the coordination of organic compounds as hole-blocking layer materials and electron-transporting layer materials of specific structures.

Images