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Synthesis, characterization and electroluminescence of carbazole-benzimidazole hybrids with thiophene/phenyl linker.
- Source :
-
Dyes & Pigments . Oct2016, Vol. 133, p132-142. 11p. - Publication Year :
- 2016
-
Abstract
- New organic luminescent materials containing carbazole and benzimidazole chromophores were synthesized by tethering them together using thiophene or phenyl spacer. Both 3,6- and 2,7-disubstitutions were explored. The functional properties of the new materials were analyzed by photophysical, electrochemical, thermal and electroluminescence properties. The thiophene containing dyes showed red-shifted absorption and emission profiles than that of the phenyl analogs due to effective electronic delocalization in the former. Also, the thiophene-based dyes exhibited low oxidation potentials than that of the phenyl analogs attributable to electron richness. Electroluminescence devices were fabricated using these dyes as emitting layer or dopant in a multi-layered configuration. The devices containing thiophene-based dyes showed relatively low turn-on voltage in the neat devices due to the favorable alignment of energy levels, which facilitated balanced charge transport. A thiophene-based dye exhibited better performance in the series with external quantum efficiency as high as 1.5%. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTROLUMINESCENCE
*CARBAZOLE
*BENZIMIDAZOLES
*THIOPHENES
*ELECTROCHEMISTRY
Subjects
Details
- Language :
- English
- ISSN :
- 01437208
- Volume :
- 133
- Database :
- Academic Search Index
- Journal :
- Dyes & Pigments
- Publication Type :
- Academic Journal
- Accession number :
- 117159658
- Full Text :
- https://doi.org/10.1016/j.dyepig.2016.05.046