[11a-A33-1~13] 12.2 Characterization and Materials Physics

12:15 PM - 12:30 PM JST(3:15 AM - 3:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[11a-A33-13] Variation in Electron Affinity Induced by Spontaneous Orientation Polarization
in OLED Materials

〇Ota Nagaoka¹, Kiyoshi Torizuka¹, Ryotaro Nakazawa¹, Hiroyuki Yoshida^1,2 (1.Chiba Univ., 2.Chiba Univ.)

Keywords:

organic semiconductor,low-energy inverse photoemission spectroscopy(LEIPS),electron affinity

The standard deviation of the electron affinity (EA) of organic light-emitting diode (OLED) materials measured by low-energy inverse photoelectron spectroscopy (LEIPS) often exceeds 0.1 eV. In this study, we focused on the giant surface potential (GSP) as a possible factor contributing to this variation. We found that the standard deviation of the EA tends to increase with increasing GSP slope, which is an indicator of the magnitude of the GSP. In addition, theoretical calculations have predicted that the EA value can be affected by the GSP. In this presentation, we compare our experimental results with theoretical calculations and discuss the relationship between the GSP and the variation in EA.