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Aggregate-enabled ultrafast exciton dynamics in dithienopyrrole-benzothiadiazole based donor-acceptor conjugated polymers were investigated to address factors affecting the material performance in optoelectronic and photonic devices such as OPV, OLED, power limiters and polariton lasers.
Dithienopyrrole-based polymers show strong nonlinear absorption and potential as optical limiters in the telecommunications region. A 17X suppression (figure-of-merit ∼ 35) is achieved in a waveguided device, arising from the strong and broad excited-state absorption.
Processing methods for optical-quality conjugated polymer charge-transfer composite films have been investigated. These materials exhibited strong energy-suppression characteristics in the near infrared regime for nanosecond pulses and show potential as efficient optical limiters for sensor protection.
The optical nonlinearities of porphyrin polymers were investigated in the telecommunications band: large values, slow kinetics in solutions revealed efficient optical limiting while large values, fast kinetics in films suggested ultrafast applications should be possible.
An original and convenient three steps (swelling–poling–deswelling) process of poling a cross-linked polymer/NLO-phore composite to produce a stable second harmonic generation is described, using as a model system a cross-linked poly-amido amine network carrying covalently attached a modified Disperse Red One, a well known NLO-phore. This procedure is expected to be of wide applicability to produce...
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