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FABRICATION
OF LIGHT-EMITTING DEVICES USING POLYELECTROLYTE FILMS AND QUANTUM
DOTS
The fabrication of light-emitting devices (LEDs) through the integration
of polyelectrolyte films and quantum dots is a new approach to making
light-emitting devices. The research involves the construction of
these devices and studying their electroluminescent properties.
The devices are made of two alternating layers of polyelectrolyte
films (cationic and anionic) which are separated by a monolayer
of Cd-Se quantum dots. The alternating polyelectrolyte films are
deposited from an aqueous solution using layer-by-layer self assembly.
One of the alternating polyelectrolyte films serves as the electron
transport layer (ETL) at the cathode and the other alternating polyelectrolyte
film serves as the hole transport later (HTL) (a hole is an electron
vacancy) at the anode. The Langmuir-Blodgett trough is used to perform
the Langmuir-Schaefer technique for the deposition of the Cd-Se
quantum dot monolayer onto the HTL. The ETL is then deposited on
top of the Cd-Se quantum dot monolayer. Once a device is constructed
a voltage is applied to it, and the current density and the brightness
of the device are investigated. These devices have applications
in making flat panel displays, and also result in better resolution
in displays and a longer life in displays.
View
final presentation as PDF
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