Novel compound and applications thereof, and organic electroluminescent device using compound

Abstract

The present invention relates to a novel organic compound and applications thereof, and an organic electroluminescent device using the compound, wherein the compound has a structure represented by thefollowing formula defined in the specification, wherein Y<1>, Y<2> and Y<3> are respectively and independently selected from H and B, at most one of Y<1>, Y<2> and Y<3> is H, X<1>, X<2> and X<3> arerespectively and independently selected from N and H, at most one of X<1>, X<2> and X<3> is H, X<4>, X<5> and X<6> are respectively and independently selected from H, a single bond, O, S and CR, R<1>-R<18> are respectively and independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C36 alkyl, substituted or unsubstituted C6-C48 monocyclic aromatic hydrocarbon or fused ringaromatic hydrocarbon, and substituted or unsubstituted C3-C48 monocyclic heteroaromatic hydrocarbon or fused ring heteroaromatic hydrocarbon, and the two adjacent groups in R<1>-R<18> can be bonded to form C1-C10 cycloalkane, C6-C30 aromatic hydrocarbon or C5-C30 heteroaromatic hydrocarbon. According to the present invention, with the application of the compound as the light emitting layer material in an OLED device, the compound exhibits excellent device performance and excellent stability. The present invention further discloses an organic electroluminescent device using the compound represented by the general formula.

Description

technical field [0001] The invention relates to a novel compound, application of the compound, and an organic light-emitting device using the compound. Background technique [0002] Organic electroluminescent devices (OLED: Organic Light Emission Diodes) are a type of device with a sandwich-like structure, including positive and negative electrode film layers and an organic functional material layer sandwiched between the electrode film layers. Due to the advantages of high brightness, fast response, wide viewing angle, simple process, and flexibility, OLED devices have attracted much attention in the field of new display technology and new lighting technology. At present, this technology has been widely used in the display panels of new lighting fixtures, smart phones and tablet computers, and will further expand to the application field of large-size display products such as TVs. It is a new type of display with fast development and high technical requirements. technology...

AI Technical Summary

Problems solved by technology

[0004] In the selection of OLED materials, singlet light-emitting fluorescent materials have a long life and low price, but low efficiency; triplet light-emitting phosphorescent materials have high efficiency, but are expensive, and the life of blue light materials has not been solved.

[0005] In the prior art, the "multiple resonance-induced thermally activated delayed fluorescence (MR-TADF)" strategy is used to design new structural compounds, such as patent applications CN107851724, CN108431984, etc., which design a single boron atom and nitrogen atom to combine multiple aromatic rings The polycyclic aromatic compounds formed by linking, that is to build a special rigid molecular system containing boron (B) atoms and nitrogen (N) atoms (as shown in the following formula (A)), where Y 1 for B, X 1 and X 2 They are N-R independently, although this kind of thermally activated delayed fluorescent molecules can have high radiative transition rate and high color purity, but their large HOMO-LUMO overlap will lead to extremely poor singlet and triplet state energies (ΔEst) of the material Larger, resulting in severe device efficiency roll-off

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