High-Tg Carbazole Derivatives as Blue-Emitting Hole-Transporting Materials for Electroluminescent Devices
| Autor: | Chin-Hsiung Chien, Jiann T. Lin, K. R. Justin Thomas, P. Kundu, Yu-Tai Tao |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
business.industry Carbazole Green-light Electroluminescence Condensed Matter Physics Excimer Photochemistry Electronic Optical and Magnetic Materials Indium tin oxide Biomaterials chemistry.chemical_compound chemistry Electrochemistry Optoelectronics Molecule Amine gas treating Benzene business |
| Zdroj: | Advanced Functional Materials. 13:445-452 |
| ISSN: | 1616-3028 1616-301X |
| DOI: | 10.1002/adfm.200304308 |
| Popis: | A series of dicarbazolyl derivatives bridged by various aromatic spacers and decorated with peripheral diarylamines were synthesized using Ullmann and Pd-catalyzed C–N coupling procedures. These derivatives emit blue light in solution. In general, they possess high glass-transition temperatures (Tg > 125 °C) which vary with the bridging segment and methyl substitution on the peripheral amine. Double-layer organic light-emitting devices were successfully fabricated using these molecules as hole-transporting and emitting materials. Devices of the configuration ITO/HTL/TPBI/Mg:Ag (ITO: indium tin oxide; HTL: hole-transporting layer; TPBI: 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene) display blue emission from the HTL layer. The EL spectra of these devices appear slightly distorted due to the exciplex formation at the interfaces. However, for the devices of the configuration ITO/HTL/Alq3/Mg:Ag (Alq3 = tris(8-hydroxyquinoline)aluminum) a bright green light from the Alq3 layer was observed. This clearly demonstrates the facile hole-transporting property of the materials described here. |
| Databáze: | OpenAIRE |
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