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Exciplex: An Intermolecular Charge-Transfer Approach for TADF
Monima Sarma1, Ken-Tsung Wong1,2
1Department of Chemistry , National Taiwan University , Taipei 10617 , Taiwan.
ACS Applied Materials & Interfaces
|April 4, 2018
Summary
Exciplex-based organic materials enable efficient organic light-emitting diodes (OLEDs) by utilizing intermolecular charge transfer for thermally activated delayed fluorescence (TADF). This approach simplifies achieving small energy gaps, paving the way for 100% internal quantum efficiency in OLEDs.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Thermally activated delayed fluorescence (TADF) materials are crucial for advanced organic light-emitting diodes (OLEDs).
- Both intramolecular and intermolecular charge transfer mechanisms contribute to TADF in organic emitters.
- Exciplex systems, formed by donor-acceptor blends, offer a promising route to efficient OLEDs.
Purpose of the Study:
- To review and discuss recent advancements in exciplex-based organic materials for OLED applications.
- To categorize exciplex systems based on their function as emitters or hosts.
- To analyze working mechanisms and future challenges in exciplex-based OLED research.
Main Methods:
- Literature review and synthesis of recent developments in exciplex-based TADF materials.
- Categorization of exciplex systems into TADF emitters and hosts for dopants.
- Discussion of electroluminescence mechanisms at donor/acceptor interfaces and co-host systems.
Main Results:
- Exciplex systems facilitate small energy gaps (Δ EST 0-0.05 eV) due to spatially separated charges.
- These systems can function as direct TADF emitters or as hosts for fluorescent, phosphorescent, and TADF dopants.
- Exciplex-based OLEDs demonstrate potential for achieving theoretical 100% internal quantum efficiency.
Conclusions:
- Exciplex-based systems present a viable strategy to overcome limitations in achieving small energy gaps for efficient TADF in organic electronics.
- Further research into exciplex systems as emitters and hosts is crucial for developing next-generation high-efficiency OLEDs.
- Addressing current challenges will accelerate progress in this rapidly evolving field of functional organic materials.
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