Abstract
New fluorescent fluorenevinylene copolymers incorporating bis(phenyl)oxadiazole, triphenylamine, or both moieties were synthesized, characterized, and used as the emissive materials in efficient electroluminescent diodes. In dilute solutions, the copolymers had blue-green fluorescence with high quantum yields of 0.76−0.87. All the copolymers had high glass transition temperatures (Tg = 147−160 °C) and outstanding thermal stability. Light emitting diodes based on the neat copolymer thin films showed bright greenish-yellow electroluminescence, with luminances of up to 1360 cd/m2, originating mostly from intramolecular charge-transfer excited states due to the presence of the donor/acceptor moieties in the copolymers. However, dilute (approximately 5 wt %) binary blends of the copolymers with poly(vinyl carbazole) gave stable blue electroluminescence (CIE = 0.17, 0.16) with higher luminances (1770−3400 cd/m2) and luminous efficiencies of up to 1.34 cd/A.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
