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Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Highly Efficient, Stable Exciplex-Based OLEDs with Narrowband Emission via Multiple Resonance Effect
Shaogang Shen1,2, Xin Xie1,2, Xinyi Lv1,2
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, and TIPC-CityU Joint Laboratory of Functional Materials and Device, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
The Journal of Physical Chemistry Letters
|June 15, 2026
Summary
Researchers developed efficient organic light-emitting diodes (OLEDs) using novel thermally activated delayed fluorescence (TADF) exciplexes. This breakthrough enhances color purity, device lifetime, and external quantum efficiency (EQE) for advanced display technologies.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Organic light-emitting diodes (OLEDs) face performance limitations in color purity, device lifetime, and external quantum efficiency (EQE).
- Exciplex-based OLEDs are particularly challenged by these metrics, hindering their widespread adoption.
- Thermally activated delayed fluorescence (TADF) offers a pathway to overcome efficiency limitations in OLEDs.
Purpose of the Study:
- To develop a novel construction strategy for efficient TADF exciplexes with narrowband emission.
- To introduce a multiresonance TADF (MR-TADF) donor to enhance exciplex performance.
- To provide a new paradigm for designing ideal exciplex luminescent materials for OLEDs.
Main Methods:
- Synthesized and characterized a multiresonance TADF (MR-TADF) donor molecule (SYBN).
- Formed exciplexes using SYBN and 2,4,6-triphenyl-1,3,5-triazine (3N) derivatives.
- Fabricated and tested OLED devices incorporating the developed exciplex system.
Main Results:
- Achieved high photoluminescence quantum yield (PLQY) up to 89% with narrow full-width at half-maximum (FWHM) down to 60 nm.
- Demonstrated strong intermolecular charge-transfer characteristics and a high driving force for exciplex formation (ΔGCS up to 1.2 eV).
- Optimal OLED devices exhibited a high EQE of 27.28%, narrow FWHM of 60 nm, and extrapolated LT50 operational lifetime exceeding 6,000 hours at 1,000 cd m⁻².
Conclusions:
- The developed MR-TADF strategy enables efficient exciplex formation with narrowband emission.
- The research breaks performance records for exciplex-based OLEDs, addressing key bottlenecks.
- This work presents a new design approach for high-performance exciplex luminescent materials.
