We demonstrate highly stable NIR organic light-emitting diodes (OLEDs) based on a system using excitonic energy transfer from thermally activated delay fluorescence molecules to NIR fluorophores. The NIR OLEDs showed an electroluminescence peak at 780 nm and robust operational stability with 2% loss of the initial radiant flux after 1000 h under a constant current density of 10 mA/cm 2 . The variation of hemoglobin oxygen saturation can be detected using the NIR OLEDs as a light source.
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Yamanaka et al. (2017) studied this question.
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