CN-122011044-A - Organometallic compound and organic light-emitting layer material

Abstract

The invention relates to the technical field of organic photoelectric materials, in particular to an organic metal compound and an organic light-emitting layer material. The organometallic compound is selected to have a dEST-2 value in the range of between 0.0001eV < DEST-2<0.30 eV. After being used for the organic electroluminescent device, the organic electroluminescent device has the characteristics of long service life, high efficiency and low driving voltage.

Inventors

• WANG HUI
• LIU KAI
• LI XIAOLONG
• WANG YU
• CUI MING
• ZHOU CE

Assignees

• 吉林奥来德光电材料股份有限公司

Dates

Publication Date

20260512

Application Date

20250928

Claims (2)

1. 1. An organometallic compound, wherein the organometallic compound has a structural formula selected from any one of the compounds represented by the following structural formulas: 。
2. 2. An organic light-emitting layer material, characterized in that it comprises a host material and a TADF material, which TADF material can be selected from the organometallic compounds according to claim 1.

Description

Organometallic compound and organic light-emitting layer material The present invention claims priority to China patent application number 202511394601X, entitled "organometallic Compound and organic light-emitting layer Material", the disclosure of which and the contents of the claims are incorporated in their entirety into the description of the present invention and are incorporated as part of the original description of the present invention. Technical Field The invention relates to the technical field of organic photoelectric materials, in particular to an organic metal compound and an organic light-emitting layer material. Background Organic semiconductor materials belong to a novel class of photovoltaic materials, which originate on a large scale from 1977 from the common discovery by the chinese senna tree, a.heeger and a.mcdiamid of doped polyethylenes having conductivity up to copper levels. Subsequently, C.Tang et al, kodak, 1987 invented small Organic Light Emitting Diodes (OLEDs). OLEDs utilize organic thin films that emit light when a voltage is applied across the device. OLEDs are becoming an increasingly interesting technology for use in applications such as flat panel displays, lighting and backlighting. Optoelectronic devices utilizing organic materials are becoming increasingly popular for a variety of reasons. For example, organic materials used to fabricate devices are relatively inexpensive, and organic photovoltaic devices have cost advantages over inorganic devices. As another example, the inherent properties of an organic material (e.g., its flexibility) may make it suitable for a particular application, such as fabrication on a flexible substrate. Organic photovoltaic devices include organic light emitting diodes/devices (OLEDs), organic phototransistors, organic photovoltaic cells, and organic photodetectors. For OLEDs, organic materials have performance advantages over conventional materials, for example, the emission color of an OLED can be achieved by the structural design of the emissive material. The OLED may include a light emitting layer or layers to achieve a desired spectrum. At present, the rapid decrease of the efficiency of phosphorescent OLEDs at high brightness remains a problem, and also results in the phenomenon of low efficiency and short lifetime of phosphorescent materials applied to organic light emitting devices. Currently, TADF materials have higher emission efficiency, high singlet energy levels, and high stability. When a TADF sensitized fluorescent device is adopted and a traditional fluorescent material is used as a light-emitting body, the TADF sensitized fluorescent device is only required to be used as a doping body to be evaporated together with a main material and a fluorescent emitter material to prepare a fluorescent device, then a light-emitting layer is formed, when electron holes are combined into excitons in the main body, the excitons firstly transfer energy to the TADF material, electrons on a triplet state are transferred to the singlet state through the trans-intersystem crossing capability of the TADF material, then the TADF material transfers the singlet state energy to the traditional fluorescent material (called FRET process), and finally fluorescence is emitted by the traditional fluorescent material, and the fluorescence is called super fluorescence. In the whole process, the TADF material is not required to emit light, but rather the material is used for collecting energy and transmitting the energy to the fluorescent emitter material. Because the sensitized fluorescence is emitted by the traditional fluorescent material, the spectrum of the sensitized fluorescent emitter has the advantages of relatively narrow spectrum, long service life and high efficiency of TADF, and is suitable for the OLED display field. Accordingly, there is still a great room for improvement in the above-mentioned requirements of the existing TADF materials, and there is a need in the industry to develop new materials for sensitized fluorescent OLED materials. Therefore, how to provide an organic electroluminescent material with long lifetime, high efficiency and low driving voltage is a problem to be solved by those skilled in the art. In view of this, the present invention has been made. Disclosure of Invention The purpose of the present invention is to provide an organometallic compound and an organic light-emitting layer material. The embodiment of the invention provides a novel organic metal compound, which is used for an organic electroluminescent device, so that the organic electroluminescent device has the characteristics of long service life, high efficiency and low driving voltage. The invention is realized in the following way: In a first aspect, embodiments of the present invention provide an organometallic compound having a La ligand having a structure represented by the following formula I: , Wherein R 1、R2、R3 and R 4 are each independently sele