Effects of Ferromagnetic Nanowires on Singlet and Triplet Exciton Fractions in Fluorescent and Phosphorescent Organic Semiconductors

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2162801· OSTI ID:1003421

Hu, Bin ^[1]; Wu, Yue ^[1]; Zhang, Zongtao ^[1]; Dai, Sheng ^[1]; Shen, Jian ^[1]

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1. ORNL

We report a magnetic field-dependent electroluminescence (EL) induced by ferromagnetic Co{sub 53}Pt{sub 47} nanowires in fluorescent conjugated polymer poly[2-methoxy-5-(2{prime}-ethylhexyloxy)-1,4-phenylenevinylene] and phosphorescent iridium-complex Ir(ppy){sub 3} molecules. The photoluminescence and EL studies indicate that the dispersed CoPt nanowires increase the singlet-to-triplet exciton ratio in organic semiconductors, suggesting that the spin-polarized holes were injected into the organic molecules from the CoPt nanowires under electrical excitation. Therefore, the use of ferromagnetic nanomaterials demonstrates a pathway to tune the optoelectronic properties that are related to singlet and triplet states in organic semiconducting materials.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1003421
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 2 Vol. 88; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTROLUMINESCENCE
EXCITATION
EXCITONS
ORGANIC SEMICONDUCTORS
PHOTOLUMINESCENCE
POLYMERS
TRIPLETS