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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Multi-Colored Light-Emitting Electrochemical Cells Based on Thermal Activated Delayed Fluorescence Host
Jiang Liu1, Jorge Oliva1, Kwing Tong1
1Department of Materials Science and Engineering, University of California, Los Angeles, California, 90095, USA.
Scientific Reports
|May 10, 2017
Summary
This study introduces thermally activated delayed fluorescence (TADF) as a host material in light-emitting electrochemical cells (LECs). This innovation enables high-efficiency, low-cost lighting solutions with stable, high luminance emissions.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Light-emitting electrochemical cells (LECs) offer a promising pathway for low-cost lighting due to their simple structure.
- Thermally activated delayed fluorescence (TADF) is a mechanism known to enhance electroluminescence efficiency in organic light-emitting devices by utilizing triplet excitons.
Purpose of the Study:
- To investigate the use of TADF materials as hosts in LECs for the first time.
- To fabricate and characterize LEC devices with TADF hosts and phosphorescent guests for various emission colors.
Main Methods:
- Solution processing of TADF host and phosphorescent guest materials.
- Fabrication of single-active-layer LEC devices.
- Performance characterization including luminance, efficiency, and stability under operational stress.
Main Results:
- Successful fabrication of LECs with green, yellow, red, and warm white emissions.
- Achieved stable emission exceeding 7000 cd/m² with peak efficiency over 7 cd/A.
- Observed transient high luminance bursts exceeding 30,000 cd/m² under high voltage stress.
Conclusions:
- Demonstrated the viability of TADF materials as hosts in LECs, enhancing device performance.
- The developed LECs exhibit high luminance and efficiency with a simplified device architecture.
- This research paves the way for cost-effective, high-luminance lighting solutions utilizing TADF technology.
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