Fabrication and characterization of electro-phosphorescent organic light-emitting devices with a ferromagnetic cathode for observation of spin injection effect

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• 作者：Eiji Shikoh ; Eiji Nakagawa ; Akihiko Fujiwara
• 关键词：Molecular spintronics ; Spin injection ; Spin transport ; Organic light-emitting device ; Circular polarization
• 刊名：Synthetic Metals
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：160
• 期：3-4
• 页码：230-234
• 全文大小：466 K

文摘

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.