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A Dislocated Twin-Locking Acceptor-Donor-Acceptor Configuration for Efficient Delayed Fluorescence with Multiple

Feng-Ming Xie¹, Hao-Ze Li², Kai Zhang³

¹Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.

Angewandte Chemie (International Ed. in English)

|October 7, 2022

Summary

A novel organic material with multiple through-space charge transfer (TSCT) states enables efficient thermally activated delayed fluorescence (TADF) and aggregation-induced emission, achieving high performance in organic light-emitting diodes.

Keywords:

Multiple Through-Space Charge Transfer Organic Light-Emitting Diodes Polycyclic Aromatic Hydrocarbons Thermally Activated Delayed Fluorescence Twin-Locking Configuration

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Area of Science:

Organic electronics
Photophysics
Materials science

Background:

Intramolecular through-space charge transfer (TSCT) excited states are key for efficient thermally activated delayed fluorescence (TADF).
Developing materials with multiple TSCT systems for enhanced optoelectronic properties remains a significant challenge in organic electronics.

Purpose of the Study:

To design and synthesize a novel organic material with a unique three-dimensional dislocated sandwich acceptor-donor-acceptor configuration.
To investigate the impact of twin-locking spiro-fluorene bridges on TSCT effects and photophysical properties.

Main Methods:

Synthesis of a rigid molecule linking biphenazine (2PXZ) donor and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor via spiro-fluorene bridges.
Characterization of photophysical properties including singlet-triplet energy difference, reverse intersystem crossing, and photoluminescence quantum yield.
Fabrication and testing of organic light-emitting diode (OLED) devices using the synthesized material as a dopant.

Main Results:

The developed 2PXZ-2TRZ molecule exhibits multiple TSCT effects due to its rigid, twin-locked structure, suppressing intramolecular rotations.
Achieved a small singlet-triplet energy difference, a rapid reverse intersystem crossing rate, and a high photoluminescence quantum yield.
The material demonstrated simultaneous TADF and aggregation-induced emission capabilities, with devices reaching 27.1% external quantum efficiency and low efficiency roll-off.

Conclusions:

The novel molecular design effectively utilizes multiple TSCT states for efficient optoelectronic applications.
The developed material offers a promising platform for high-performance organic light-emitting diodes with improved efficiency and stability.
This work provides insights into the rational design of advanced organic materials for next-generation electronic devices.