| Abstract
| - Electroluminescent materials comprising quinoxaline, triarylamine, and fluorophores such as carbazole,pyrene, and fluorene were prepared by using a key step involving a Pd-catalyzed C−N coupling reaction.Chromophores were embedded both at quinoxaline and triarylamine units, and their influence onphotophysical and thermal properties was investigated. Quinoxalines possessing more electron-donatingamines exhibit lower fluorescence quantum efficiency and the photoluminescence (PL) is severely affectedby the polarity of the solvent used for measurement. Bulky and rigid aromatic groups such as pyrene andcarbazole enhance the glass transition temperature of the derivatives. Oxidation potential of the triarylaminewas easily tuned by the aromatic substituents while retaining the reduction potential of the quinoxalinesegment. This provides us a method for tuning the photophysical and thermal properties maintaining theenergy levels of the dipolar compounds. The electroluminescent devices fabricated using these materialsas hole-transporters and emitters led to intense light emission. The emission color is green and correspondswell with the film PL of the material used.
- Electroluminescent materials comprising quinoxaline, triarylamine, and fluorophores such as pyrene, anthracene, and fluorene have been synthesized. Electroluminescent devices of good performance can be fabricated using these materials as hole-transporters/emitters.
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