[14p-302-1~17] 12.4 Organic light-emitting devices and organic transistors

[14p-302-12] Analysis of Molecular Orientation in Organic Semiconducting Amorphous Film Using Dynamic Nuclear Polarization Enhanced Solid-State NMR

〇Katsuaki Suzuki¹, Shosei Kubo¹, Aussenacn Fabien², Engelk Frank², Tatsuya Fukushima¹, Hironori Kaji¹ (1.Kyoto Univ., 2.Bruker Biospin)

Keywords:Organic semiconductor, Solid-state NMR, Analysis of Molecular Orientation

We show the first application of dynamic nuclear polarization (DNP)- enhanced static solid-state NMR to an organic semiconducting molecule. We analyzed the orientation of phenyl-dipyrenylphosphine oxide (POPy₂) film sublimed or drop-casted on the glass sheets. The ¹H-³¹P CP DNP-NMR spectra showed a clear chemical shift anisotropy broadening line pattern, which indicates the perpendicular orientation of P=O axis against the glass sheet for sublimed POPy₂ and random orientation of P=O axis for drop-casted POPy₂.