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A series of NIR organic chromophores with donor–π–acceptor–π–donor structure are synthesized. Good thermal stability and strong photoluminescence in solid state render them suitable for application in light-emitting diodes. Exclusive near-infrared emission at 1080 nm with external quantum efficiency of 0.28% is obtained from the nondoped OLEDs. The longest electroluminescence wavelength is 1220 nm.
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Qian et al. (2008) studied this question.
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