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Updated: Jun 5, 2025

Spatial Separation of Molecular Conformers and Clusters

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Published on: January 9, 2014

Efficiency Boost in Through Space Charge Transfer Emitters: Insights from Spiro Lateral Rocking Confinement.

Rui-Hong Liu¹, Meng-Tian Li¹, Yue-Jian Yang¹

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

Advanced Materials (Deerfield Beach, Fla.)

|December 13, 2024

Summary

Restricting molecular rocking in through-space charge-transfer (TSCT) emitters enhances performance. This strategy improves organic light-emitting diode (OLED) efficiency by controlling excited state dynamics.

Keywords:

organic light‐emitting diodes spiro structure thermally activated delayed fluorescence through‐space charge‐transfer

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Area of Science:

Materials Science
Organic Chemistry
Photophysics

Background:

Intramolecular through-space charge-transfer (TSCT) excited states are key for thermally activated delayed fluorescence (TADF) emitters.
Tuning excited state dynamics is crucial for efficient exciton utilization in TADF materials.
Conformational engineering presents challenges but offers opportunities for performance enhancement.

Purpose of the Study:

To develop a strategy for enhancing TSCT-TADF molecule performance by controlling conformational dynamics.
To investigate the impact of restricted molecular motion on excited state properties.
To design and synthesize novel TSCT-TADF emitters for high-efficiency organic light-emitting diodes (OLEDs).

Main Methods:

Synthesized two TSCT-TADF emitters, 8PhDM-B and 8PyDM-B, utilizing a rigid spiro-fluorene bridge.
Incorporated immobilizing groups to restrict the lateral rocking of the spiro unit.
Fabricated OLED devices using the synthesized emitters to evaluate their performance.

Main Results:

The immobilization strategy effectively restricted the lateral rocking of the spiro unit, influencing donor-acceptor conformations.
OLED devices incorporating 8PhDM-B and 8PyDM-B achieved high maximum external quantum efficiencies of 33.1% and 31.0%, respectively.
Demonstrated a clear correlation between restricted molecular motion and improved emitter performance.

Conclusions:

Restricting molecular rocking via immobilizing groups is an effective strategy to enhance TSCT-TADF emitter performance.
This approach allows for fine-tuning of excited state dynamics, leading to improved exciton utilization.
The findings provide valuable insights for the rational design of next-generation, highly efficient OLED emitters.