Abstract
Recent advances in organic spin response have unraveled long polaron spin coherence time, substantive magnetic field effect (MFE) in organic light emitting diodes (OLED) and films, and spin-polarized carrier injection from ferromagnetic electrodes in organic spin valves (OSV). Here we compare spin response in films, OLED and OSV devices based on π-conjugated polymers made of protonated, and deuterated (D-) hydrogen having weaker HFI strength. We show that the HFI plays a crucial role in determining the spin response in all devices. OLEDs (and films) based on the D-polymers show substantial narrower MFE response, and the larger spin diffusion length leads to higher magnetoresistance. We also show that the dominant MFE (B) response in devices and films is the polaron pair model.
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