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Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Air-Stable and High-Performance Solution-Processed Organic Light-Emitting Devices Based on Hydrophobic Polymeric
Shugo Sato1, Satoru Ohisa1,2,3, Yukihiro Hayashi1
1Department of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|March 14, 2018
Summary
Researchers developed a new electron-injection layer (EIL) using poly(DDA)TFSI for polymer light-emitting devices (PLEDs). This stable EIL enhances device efficiency and air stability, outperforming traditional materials.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Solution-processed organic light-emitting devices (OLEDs) often use alkali-metal compound electron-injection layers (EILs) for higher efficiency.
- These EILs are prone to moisture degradation, limiting device lifespan and stability.
- Developing air-stable EILs with high electron-injection efficiency is crucial for practical OLED applications.
Purpose of the Study:
- To investigate poly(diallyldimethylammonium)-based polymeric ionic liquids as electron-injection layers (EILs) in polymer light-emitting devices (PLEDs).
- To evaluate the air stability and electroluminescence performance of PLEDs utilizing poly(DDA)TFSI as an EIL.
- To assess the potential of poly(DDA)TFSI as a hole-injection layer (HIL) in PLEDs.
Main Methods:
- Experimental investigation and analytical study of PLEDs using F8BT polymer and poly(DDA)TFSI as EIL.
- Fabrication and characterization of PLEDs with poly(DDA)TFSI as both EIL and HIL.
- Performance evaluation including turn-on voltage, external quantum efficiency, current efficiency, and power efficiency.
Main Results:
- The optimized PLED with poly(DDA)TFSI as EIL demonstrated excellent storage stability in air.
- Achieved low turn-on voltage (2.01 V), high external quantum efficiency (9.00%), current efficiency (30.1 cd A-1), and power efficiency (32.4 lm W-1).
- PLEDs utilizing poly(DDA)TFSI as a HIL showed performance comparable to conventional HILs.
Conclusions:
- Polymeric ionic liquids, specifically poly(DDA)TFSI, are promising air-stable alternatives for EILs in PLEDs.
- Poly(DDA)TFSI offers significant improvements in device efficiency and operational stability.
- The dual functionality of poly(DDA)TFSI as both EIL and HIL presents a versatile approach for advanced PLED design.
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