Journal
ACS PHOTONICS
Volume 4, Issue 8, Pages 1899-1905Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00567
Keywords
organic light-emitting diodes; exciplex; magneto-electroluminescence; organic spintronics; thermally activated delayed fluorescence
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Funding
- Samsung Global Research Outreach (GRO)
- NSF [DMR-1701427]
- NSF-Material Science & Engineering Center (MRSEC) program at the University of Utah [DMR-1121252]
- China Scholarship Council (CSC)
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Exciplex organic light-emitting diodes (XOLEDs) utilize nonemissive triplet excitons via a reverse intersystem crossing process of thermally activated delayed fluorescence. The small energy difference between the lowest singlet and triplet levels of exciplex also allows a magnetic field to manipulate their populations, thereby achieving ultralarge intrinsic magneto-electroluminescence (MEL) in XOLEDs. Here we incorporate it into a hybrid type of spintronic device (hybrid spin-XOLED), where the XOLED is connected to a magnetic tunnel junction with large magnetoresistance, to introduce an extrinsic MEL response that interferes with the intrinsic MEL. The ratio between two MEL contributions, the MEL value, and the field response were altered by changing the exciplex layer thickness or actively manipulated by adding another current source that drives the XOLED. Most importantly, by involving two XOLEDs (green and red) in the same circuit, the hybrid spin-XOLED shows a color change when sweeping the magnetic field, which provides an alternative way for future OLED display technologies.
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