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Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
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Solution-processed multilayer small-molecule light-emitting devices with high-efficiency white-light emission.
Naoya Aizawa1, Yong-Jin Pu1, Michitake Watanabe1
1Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata University, 4-3-16 Johnan, Yonezawa 992-8510, Japan.
Nature Communications
|December 19, 2014
Summary
Researchers developed efficient multilayer organic light-emitting diodes (OLEDs) using small molecules. Covalent dimerization/trimerization of host molecules improved solvent resistance, enabling solution processing and achieving record power efficiencies for blue, green, and white OLEDs.
Area of Science:
- Materials Science
- Organic Electronics
- Device Physics
Background:
- Recent advances in π-conjugated polymers have improved solution-processed organic light-emitting diodes (OLEDs).
- Further efficiency enhancements are crucial for OLEDs to rival traditional light sources.
- Existing methods face challenges in achieving high performance with solution-processed multilayer structures.
Purpose of the Study:
- To demonstrate efficient multilayer OLEDs fabricated using small molecules via solution processing.
- To investigate methods for enhancing the solvent resistance of host molecules for multilayer fabrication.
- To achieve record power efficiencies in solution-processed blue, green, and white OLEDs.
Main Methods:
- Developed small host molecules with covalent dimerization or trimerization to improve alcohol solvent resistance.
- Employed solvent resistance tests to validate the stability of host molecules during multilayer processing.
- Fabricated multilayer OLEDs through sequential solution-processing steps.
Main Results:
- Achieved record power efficiencies of 36, 52, and 34 lm W⁻¹ at 100 cd m⁻² for solution-processed blue, green, and white OLEDs, respectively.
- Demonstrated stable electroluminescence spectra across varying current densities.
- Identified interface composition as a critical factor influencing device performance.
Conclusions:
- Covalent dimerization/trimerization of small host molecules provides sufficient solvent resistance for multilayer solution processing.
- This approach enables the fabrication of highly efficient, solution-processed multilayer OLEDs.
- Optimizing the interface composition is key to maximizing device performance in multilayer OLEDs.
