Syntheses, Properties and Applications of homologous oligofluorenes and indenothiophene-embedded oligomers
Date Issued
2006
Date
2006
Author(s)
Chao, Teng-Chih
DOI
zh-TW
Abstract
We have successfully synthesized homologous series of oligofluorenes with variety of C9 substituents and backbone lengths by successive Suzuki coupling reactions. The correlation between molecular structure and physical properties including thermal stability, fluorescent quantum yields, and emission wavelength etc, has been investigated systematically for probing the structure-physical property relationship. The bulky and rigid 9,9-diaryl substituents are significantly beneficial for their high morphological and thermal stability. The emission maxima of these oligomers were lying on the blue region and closely dependent on the conjugation length. Cyclic voltammetry experiments reveal that these oligofluorenes exhibit potential ambipolar carrier transport property. These intriguing characteristics render them as the most promising candidates for OLEDs. The UV-OLED and red electrophosphorecent devices have been achieved using these oligomers as emitter or host materials.
On the other hand, We have also successfully synthesized a series of thiophene-embedded conjugated oligomer with variety of backbone lengths by successive Negishi and Suzuki coupling reactions. The physical properties of these novel oligofluorene analogues are significantly altered upon introducing thiophene units as constituents. The presence of the thiophene and their coplanarity with adjacent phenylene rings provides these molecules with promising properties. We are presently fabricating light-emitting devices that incorporate these molecules as active materials.
Subjects
寡聚芴
有機發光二極體
載子傳輸率
oligofluorene
indenothiophene
OLED
mobility
Type
thesis
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