Abstract
Organic light-emitting devices (OLEDs) with a phosphorescent molecule Ir(ppy) 3 as the emitter and with an Fe cathode as the spin injector were fabricated for the observation of the large degree of circular polarization. The OLED structure was a glass-substrate/ITO/α-NPD/CBP doped with Ir(ppy) 3/BCP/Al-oxide/Fe/Al. The mixing ratio of CBP and Ir(ppy) 3 in the emissive layer was optimized for high luminescence efficiency. The OLEDs showed circular polarization, and the maximum degree of circular polarization of the OLEDs was 0.4% at the applied magnetic field of 1.6 T at room temperature. On the other hand, no circular polarization was observed from the OLEDs with an Al cathode.
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