We have demonstrated enhanced efficiency from organic light-emitting devices (OLEDs) with Fe 3 O 4 -coated indium−tin−oxide (ITO) anodes. The current efficiency of the OLEDs with Fe 3 O 4 /ITO anode is increased by 10.5%, when an external magnetic field is applied. This improvement is ascribed to the magnetic field-induced spin polarization of holes injected through the spin aligner of the Fe 3 O 4 film, which results in an enhanced formation ratio of singlet excitons. In addition, Fe 3 O 4 is also found acting as an anodic buffer to increase the hole-injection efficiency. The improved luminance and efficiency considered as resulting from the anode interfacial modification of Fe 3 O 4 compared to the devices with bare ITO.
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Feng et al. (2010) studied this question.
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