An organic electroluminescent material, an organic electroluminescent device, and an organic electroluminescent apparatus

By employing an organic electroluminescent material with a low-refractive-index (arylalkylfluorene) core linked to an aromatic amine group, the problems of insufficient efficiency and lifetime of the light-emitting auxiliary layer material in the prior art have been solved, realizing an organic electroluminescent device with high-efficiency light extraction and long lifetime.

CN122212950APending Publication Date: 2026-06-16JILIN OPTICAL & ELECTRONICS MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JILIN OPTICAL & ELECTRONICS MATERIALS CO LTD
Filing Date
2026-05-21
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing technologies lack luminescent auxiliary layer materials that can significantly improve the luminous efficiency and lifetime of organic electroluminescent devices, especially since the energy level barrier problem between the hole transport layer and the luminescent layer has not been effectively solved.

Method used

An organic electroluminescent material with an arylalkylfluorene core and an aromatic amino group connected to it, wherein the aromatic amino group side chain contains a 1,1,4,4-tetramethyl-1,2,3,4-tetrahydronaphthalene derivative, was used to prepare a low-refractive-index compound of formula I. This compound was applied to the light-emitting auxiliary layer and combined with a high-refractive-index material to improve light extraction efficiency.

Benefits of technology

By using a low-refractive-index light-emitting auxiliary material, the light-gathering effect is enhanced, light loss is reduced, the luminous efficiency and lifespan of the device are improved, and the driving voltage is reduced.

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Abstract

This invention discloses an organic electroluminescent material, an organic electroluminescent device, and an organic electroluminescent apparatus, relating to the field of organic electroluminescent materials technology. The invention uses compound formula I as the core, linked to an aromatic amine group. One of the aromatic amine side chains contains a 1,1,4,4-tetramethyl-1,2,3,4-tetrahydronaphthalene derivative, and the other aromatic amine side chain is an aryl or heteroaryl group. Compound formula I has a low refractive index and is used as the thicker layer in a bilayer light-emitting auxiliary material. This allows light emitted from the device to pass through the low-refractive-index film of formula I. The organic electroluminescent device prepared by combining this low-refractive-index film with the high-refractive-index light-emitting auxiliary material can better concentrate light, emitting specific wavelengths of light emitted from the device. This narrows the emission spectrum, enhances the luminous intensity of specific wavelengths, reduces light loss, and improves the device's luminous efficiency, while ensuring a low driving voltage and a long device lifespan.
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