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We report strong and efficient near infrared emission from organic light-emitting devices (OLEDs) based on two donor-acceptor-donor oligomers. These oligomers have fluorescent quantum yields of up to 20% and their energy gap can be tuned by changing the strengths of the donor and acceptor components. Electroluminescence with peak emission wavelengths of 692 and 815 nm were observed from the two oligomers studied here. External quantum efficiencies up to 1.6% and electrical-to-optical power efficiencies up to 7.0 mW/W were achieved in OLEDs based on these near-infrared emitters.
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Yang et al. (2008) studied this question.
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