Spontaneous orientation of polar OLED materials: its role and applications (Conference Presentation)

Yuya Tanaka; Yuki Tazo; Shin Shinohara; Hideyuki Kayaguchi; Naoya Abe; Keisuke Kurihara; Masahiro Ohara; Hisao Ishii

doi:10.1117/12.2633192

3 October 2022 Spontaneous orientation of polar OLED materials: its role and applications (Conference Presentation)

Yuya Tanaka, Yuki Tazo, Shin Shinohara, Hideyuki Kayaguchi, Naoya Abe, Keisuke Kurihara, Masahiro Ohara, Hisao Ishii

Proceedings Volume PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI; PC122080Z (2022) https://doi.org/10.1117/12.2633192
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Abstract

In vacuum-deposited film composed of polar OLED materials such as Alq3 and TPBi, the permanent dipole moment of the molecules spontaneously orders surface normal on average, resulting in the formation of polarization charge on the film surface and reverse sides. These polarized charges attract charge carriers of the opposite sign because of the Coulomb interaction: They are an essential factor determining the dynamic behavior of charge carriers in the device, such as injection from the electrode to organic material and accumulation at the heterointerface. In this talk, we will mainly discuss the role of the polarization charge in OLEDs.

Conference Presentation

Citation Download Citation

Yuya Tanaka, Yuki Tazo, Shin Shinohara, Hideyuki Kayaguchi, Naoya Abe, Keisuke Kurihara, Masahiro Ohara, and Hisao Ishii "Spontaneous orientation of polar OLED materials: its role and applications (Conference Presentation)", Proc. SPIE PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, PC122080Z (3 October 2022); https://doi.org/10.1117/12.2633192

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