Junji Wakita

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To clarify the nature of optical absorptions in polyimides (PIs), the ultraviolet-visible optical absorption spectra of PI thin films were observed at high pressures up to 400 MPa using a custom-built hydrostatic pressure optical cell. A pressure-induced bathochromic shift with increasing bandwidth was observed in the locally excited (LE) absorption band(More)
To develop a molecular design concept for highly fluorescent polyimides (PIs), ultraviolet-visible optical absorption spectra and fluorescent excitation/emission spectra of PI thin films were extensively investigated with the aid of density functional theory calculations. It was clarified that fully aromatic PIs (Ar-PIs) have strong charge transfer (CT)(More)
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