Boron-containing organic compound and light-emitting device

Abstract

The invention discloses a boron-containing organic compound and a light-emitting device. The boron-containing organic compound comprises compounds as shown in any one of formulas (I)-(III), wherein R1-R14 are respectively selected from any one of the following groups: hydrogen, deuterium, halogen, cyano, NO2, N (R) 2, OR, SR, C(=O) R, P(=O) R, Si(R)3, substituted or unsubstituted C1-C20 alkyl group, C2-C20 alkenyl group, C2-C20 alkynyl group, C6-C40 aryl group and C5-C40 heteroaryl group; M is a substituted or unsubstituted C6-C48 aryl group; X1 and X2 are respectively selected from any one of the following groups: O, S, N-Y and C(Y)2; and Y is selected from any one of the following groups: a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C6-C40 aryl group or a substituted or unsubstituted C5-C40 heteroaryl group. The light-emitting device comprises a first electrode, a second electrode and an organic layer arranged between the first electrode and the second electrode, and the organic layer contains at least one boron-containing organic compound.

Description

technical field [0001] The invention relates to the field of organic photoelectric technology, in particular to a boron-containing organic compound and a light-emitting device. Background technique [0002] Organic electroluminescent devices have a series of advantages such as self-luminescence, low-voltage drive, full curing, wide viewing angle, simple composition and process; compared with liquid crystal displays, organic electroluminescent devices do not require a backlight. Therefore, organic electroluminescent devices have broad application prospects. [0003] An organic electroluminescent device generally includes an anode, a metal cathode, and an organic layer sandwiched between them. The organic layer mainly includes a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer. In addition, most light-emitting layers adopt a host-guest structur...

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Problems solved by technology

[0005] Currently commercially used blue-light boron-nitride materials are relatively popular multiple resonance thermally excited delayed fluorescence materials (MR-TADF), although theoretically this type of material can use the triplet state to increase the utilization rate of excitons to 100%, but The current commercialized blue-light boron-nitrogen-based triplet excitons have too long lifetimes, resulting in short device lifetimes and large efficiency roll-offs at high current densities. Therefore, many panel manufacturers mostly choose to increase device lifetimes and reduce device efficiency. Emitting only the singlet state of the material

How to use the triplet excitons of such materials in industry to improve device efficiency and ensure a long device life still faces many key problems; in addition, due to the relatively good planar structure of the current commercialized blue-light boron-nitride molecules, in The self-quenching effect is very serious under high doping concentration, and it is usually necessary to prepare devices at extremely low doping concentration, which seriously affects the operability of the process

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