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Efficient NIR emission from organic light-emitting devices based on acceptor-donor-acceptor (A-D-A) and donor-acceptor-donor (D-A-D) oligomers.

In this paper, two new organic light emitting diodes in near infrared (NIR) range were fabricated based on acceptor-donor-acceptor (A-D-A) and donor-acceptor-donor (D-A-D) oligomers. We found that, the electroluminescent (EL) spectra of these oligomers which have the wavelength range from 900 to 1150 nm. The maximum external quantum efficiencies (EQE) and electrical to optical power efficiencies for these devices were measured and they found to be (3.3%, 16.7 mW/W) and (1.32%, 6.6 mW/W) for A-D-A and D-A-D oligomers respectively.