A class of polyaromatic ring compounds used as electroluminescent materials and light-emitting devices thereof

Abstract

The invention belongs to the technical field of organic optoelectronic materials, and relates to a class of polyaromatic ring compounds used as electroluminescent materials and their applications. The polyaromatic ring compounds have a molecular structure as shown in formula (1): the polyaromatic compound provided by the invention Cyclic compounds connect small conjugated aromatic rings into polyaromatic ring compounds through elements or groups such as boron, phosphorus and oxygen, and use non-carbon bridging groups to connect small conjugated ring systems, which can reduce the strong conjugation between polycyclic rings interaction, thereby inhibiting the degree of delocalization of HOMO and LUMO, so that the energy difference of HOMO‑LUMO will not become too small, and the T1 energy level will not be too low, so this type of compound has a larger HOMO‑LUMO Poor energy, can emit high-quality blue, sky blue and dark blue light.

Description

technical field [0001] The invention belongs to the technical field of organic photoelectric materials, and in particular relates to a class of polycyclic aromatic compounds and a light emitting device thereof. Background technique [0002] As an emerging display technology, organic electroluminescence technology has the advantages of high brightness, low driving voltage, high luminous efficiency, simple structure, and large viewing angle, and has a very broad application prospect. At present, among the red, green, and blue primary color materials used to prepare full-color organic light-emitting diodes, red light materials and green light materials have basically met the requirements of industrialization, while blue light materials have excellent performance in terms of fluorescence efficiency, color purity, lifespan, and brightness. There is still a large distance from industrial application, which has become a technical problem in this industry. [0003] At present, blue...

AI Technical Summary

Problems solved by technology

The small conjugated aromatic ring system has a large HOMO-LUMO energy difference, but its redox stability is not good enough, and the emission spectrum often has a large shoulder peak, which is likely to cause poor color purity; while the aromatic ring system with a large conjugated ring The system has good redox stability, but it is easy to produce a relatively small HOMO-LUMO energy difference, and it is also easy to produce a low-energy triplet excited state, which is not suitable as a blue light-emitting material

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