A multiple resonance thermally activated delayed fluorescence compound based on hexa-substituted phenyl as a core and a steric heavy atom effect, a preparation method and an organic electroluminescent device
By introducing hexasubstituted phenyl groups and compounds with spatial heavy atom effects into MR-TADF materials, the problem of separating HOMO and LUMO was solved, promoting the RISC process and inhibiting molecular aggregation, thus achieving efficient and stable light-emitting performance, suitable for organic electroluminescent devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF NEW DISPLAY TECH HENAN ACAD OF SCI
- Filing Date
- 2024-12-16
- Publication Date
- 2026-06-19
AI Technical Summary
Existing MR-TADF materials face significant challenges in separating HOMO and LUMO, resulting in large ΔEST, low antisystem crossing rates, and long fluorescence lifetimes. Furthermore, the planar molecular structure is prone to intermolecular interactions, leading to aggregation quenching and broadening of the emission spectrum.
A multi-resonance thermally activated delayed fluorescence compound based on a hexasubstituted phenyl core and the spatial heavy atom effect is employed. Through the alternating connection of heavy atom structural units and MR-TADF units on the central benzene ring, the RISC process is promoted by spatial interactions, and molecular aggregation is inhibited by a propeller-shaped molecular skeleton.
It effectively reduces delayed fluorescence lifetime, improves device performance, suppresses efficiency roll-off, avoids aggregation of light-emitting units, maintains narrow spectral characteristics and high external quantum efficiency, and adapts to a wider doping window.
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