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Theoretical study of the organic light emitting devices

Patel, Nikunjkumar Dineshbhai (2017). Theoretical study of the organic light emitting devices. Master of Engineering Thesis, Charles Darwin University.

Document type: Thesis
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Author Patel, Nikunjkumar Dineshbhai
Title Theoretical study of the organic light emitting devices
Institution Charles Darwin University
Publication Date 2017-05
Thesis Type Master of Engineering
Supervisor Singh, Jai
Ompong, David
Subjects ENGINEERING
0906 - Electrical and Electronic Engineering
Abstract The organic light emitting devices are currently a great area of research owing to their potential applications and outstanding characteristics. The organic light emitting diodes (OLEDs) are devices with commercial applications such as flexible displays and solid state lighting. OLEDs work on the principle of electroluminescence where light is produced when an electric current is passed through the device. They are highly efficient and flexible compared to traditional lighting devices such as fluorescent lamps, incandescent light bulbs and light emitting diodes (LEDs). There are two types of organic light emitting diodes based on the material used: Fluorescent and Phosphorescent. The thesis reviews on the working of phosphorescent OLEDs and on how the device performance can be improved by doping heavy metal atom in the organic emitting layer.

The thesis is mainly focused on OLEDs with double heterostructure that contains three different layers including organic emissive layer doped with rhenium copolymer. Each layer’s thickness was optimised to enhance the efficiency of the device. The operation of OLED can be divided into three different processes; the injection of holes (positive charge) and electrons (negative charge), transportation of charges to the interface, recombination of holes and electrons to form excitons which emit light. Optimising any of the processes can improve the performance of the device. Besides, materials for electron transport layer and hole transport layer were chosen to get better output results. The General-Purpose Photovoltaic Device Model (GPVDM) software was used to perform the simulation. Light output efficiency obtained was compared to other research work carried out in previous years. Still, the efficiency can be improved by designing micro-cavity or tandem structure OLEDs.
Keyword electroluminescence
organic
exciton
fluorescent
phosphorescent
rhenium
heterostructure
copolymer


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