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Updated: Feb 8, 2026
07:44
Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
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Exploiting Singlet Fission in Organic Light-Emitting Diodes.
Ryo Nagata1,2,3, Hajime Nakanotani1,2,3,4, William J Potscavage1,2
1Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|July 6, 2018
Summary
Organic light-emitting diodes (OLEDs) can now exceed 100% exciton production efficiency by using singlet fission. This breakthrough enables efficient near-infrared (NIR) electroluminescence for advanced applications.
Area of Science:
- Organic electronics
- Photophysics
Background:
- Electroluminescence quantum efficiencies in organic light-emitting diodes (OLEDs) are typically limited by exciton production efficiency.
- Harvesting both singlet and triplet excitons approaches 100% efficiency, but theoretical limits restrict production to 100% of electron-hole pairs.
Purpose of the Study:
- To overcome the theoretical 100% exciton production limit in OLEDs.
- To demonstrate the exploitation of singlet fission for enhanced electroluminescence.
- To achieve high-efficiency near-infrared (NIR) light emission.
Main Methods:
- Utilized singlet fission in a rubrene host matrix within an OLED device.
- Investigated the dependence of electroluminescence intensity on an applied magnetic field.
- Observed excitonic energy transfer from rubrene's triplet state to erbium(III) tris(8-hydroxyquinoline) (ErQ3).
Main Results:
- Achieved an overall exciton production efficiency of 100.8%.
- Confirmed triplet production via singlet fission through magnetic field-dependent electroluminescence.
- Generated near-infrared (NIR) electroluminescence via energy transfer to ErQ3.
Conclusions:
- Demonstrated the feasibility of harvesting singlet fission-produced triplets for electroluminescence under electrical excitation.
- Showcased a viable method for enhancing OLED quantum efficiency.
- Paved the way for developing high-intensity NIR light sources for sensing, optical communications, and medical applications.
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