Study of Charge Transport in Amorphous Organic Semiconductors and OLED Materials
Date Issued
2005
Date
2005
Author(s)
Hung, Wen-Yi
DOI
en-US
Abstract
Charge transport in organic material plays a crucial role in performances of organic optoelectronic devices. In this thesis, we used the time-of-flight measurement technique to study charge-transport properties of various materials.
In the first part of the work, we found that a class of furan-containing oligoaryls that contain no amine moiety could be used as hole-transport materials for OLEDs and devices incorporating such compounds exhibited promising characteristics. In the second part of the work, unprecedented nondispersive ambipolar carrier transport was revealed for a series of terfluorenes. Carrier-transport properties of terflurenes with different types of C9 substitutions were compared. We found that by introducing spiroconjugation between a core chromophore and spiro-linked conjugated substitutions, the bulky substitution not only serves as a spatial hindrance to enhance morphological stability and emission efficiency in the solid states, but can also bridge and enhance intermolecular charge transport, yet still with electronic properties of the core chromophore rather intact. In the third part of the , a new TOF measurement configuration using terflourenes as the charge-generation layer in TOF measurements is discussed. We successfully used this method to measure charge-transport properties of a wide range OLED materials, which otherwise are more difficult to measure by traditional TOF techniques. Finally, we investigated the charge-transporting properties of terflourene-dispersed polymers with different concentrations. Efficient bipolar transport was observed in such MDP systems, indicating potential applications in eletrophotography as organic photoreceptors.
Subjects
載子傳輸
有機半導體
遷移率
Organic Semiconductors
Charge Transport
Mobility
TOF
Type
thesis
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