Blue photoluminescence N-substituted poly(4H-benzo[def]carbazole)s
| Autor: | Kosuke Shibasaki, Masashi Kijima, ZhongMin Geng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Condensation polymer Photoluminescence Band gap Carbazole Mechanical Engineering Metals and Alloys 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Monomer chemistry Mechanics of Materials Polymer chemistry Materials Chemistry Thermal stability 0210 nano-technology HOMO/LUMO |
| Zdroj: | Synthetic Metals. 213:57-64 |
| ISSN: | 0379-6779 |
| Popis: | N-Alkyl and N-phenyl substituted poly(carbazole)s having a 4,5-ethenylene bridge, poly(4 H -benzo[ def ]carbazole)s, were newly synthesized. Poly(carbazole)s having a 4,5-ethylene bridge were also synthesized for comparison. They were prepared from corresponding dibromo monomers by Ni(0)-catalyzed Yamamoto polycondensation. All the polymers had good solubility in common organic solvents, enough high molecular weights to make thin films, and good thermal stability showing about 400 °C of temperature at 5 wt% loss in TGA. The band gaps of these polymers were in the range of 2.77–3.15 eV which were appropriate for bluish light emissions. The absorption and emission maxima of these polymers in CHCl 3 were in the ranges of 361–396 and 419–456 nm, respectively. These polymers showed good fluorescence quantum efficiencies in CHCl 3 . The energy levels of highest occupied molecular orbital of the poly(benzocarbazole)s were shallower than those of corresponding 4,5-ethylene bridged poly(carbazole)s. |
| Databáze: | OpenAIRE |
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