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Aggregation Enhanced Thermally Activated Delayed Fluorescence through Spin-Orbit Coupling Regulation.

Wei Zhang¹, Shuai Li², Yujie Gong²

¹Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.

Angewandte Chemie (International Ed. in English)

|May 2, 2024

Summary

Aggregation-induced emission (AIE) and thermally activated delayed fluorescence (TADF) materials show enhanced light emission. Aggregation boosts fluorescence and influences excited-state dynamics, guiding the design of efficient organic light-emitting diodes (OLEDs).

Keywords:

aggregation spin-orbit coupling thermally activated delayed fluorescence ultrafast spectroscopy

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Published on: December 27, 2018

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Thermally activated delayed fluorescence (TADF) and aggregation-induced emission (AIE) are key phenomena in developing efficient organic light-emitting diodes (OLEDs).
A comprehensive understanding of the interplay between AIE and TADF mechanisms is crucial for optimizing material performance.

Purpose of the Study:

To investigate the impact of aggregation on the photophysical properties of TADF emitters.
To elucidate the mechanisms by which aggregation influences excited-state dynamics and luminescence efficiency.

Main Methods:

Modulation of the TADF process through controlled aggregation.
Analysis of excited-state dynamics and molecular reorientation under aggregation conditions.

Main Results:

Aggregation simultaneously enhances both prompt and delayed fluorescence.
Restricted molecular reorientation due to aggregation strengthens spin-orbit coupling.
Aggregation leads to a reduced energy gap between singlet and triplet states.

Conclusions:

Aggregation significantly impacts TADF materials by enhancing luminescence and altering excited-state properties.
The findings provide fundamental insights into the aggregation effect on TADF mechanisms.
This study offers guidance for designing high-efficiency photoluminescent materials for OLED applications.