Voltage-induced electroluminescence characteristics of hybrid light-emitting diodes with CdSe/Cd/ZnS core-shell nanoparticles embedded in a conducting polymer on plastic substrates

Journal Article · Mon Mar 10 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4868643· OSTI ID:22257048

Kwak, Kiyeol; Cho, Kyoungah; Kim, Sangsig ^[1]

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1. Department of Electrical Engineering, Korea University, Seoul 136-713 (Korea, Republic of)

We investigate the electroluminescence (EL) characteristics of a hybrid light-emitting diode (HyLED) with an emissive layer comprised of CdSe/Cd/ZnS core-shell nanoparticles (NPs) embedded in poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) on a plastic substrate. The EL characteristics change dramatically with increasing of the biased voltage. At low voltages, recombination of electrons and holes occurs only in the PFO film because of poor charge transfer in the PFO-CdSe/Cd/ZnS NPs composite film, while the color of the light-emitting from the HyLED changes from blue to red as the biased voltage increases from 7.5 to 17.5 V. We examine and discuss the mechanism of this color tunability.

• OSTI ID: 22257048
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 10 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CADMIUM
CADMIUM SELENIDES
ELECTRIC POTENTIAL
ELECTROLUMINESCENCE
LIGHT EMITTING DIODES
NANOSTRUCTURES
SUBSTRATES
ZINC SULFIDES