ジヒドロキシナフトフルオランによるエレクトロファックスのスペクトル増感

概要

論文の詳細を見る
Dihydroxynaphthofluoran (disodium salt), one of xanthene dyes, has been observed to sensitize sensitize the zinc oxide-resin electrophotographic layer in the red portion of the spectrum.<br/>Activation spectra show that the response (λmax. of sensitivity) is under the influence of the nature of a binder resin.<br/>When the dye (DHNF·Na2) is applied to ZnO-Silicone Resin or ZnO-Polyvinyl acetate system, λmax. of the response is around 610 mμ or 640 mμ, respectively. These values agree with λmax. of absorption spectra of solid solutions of the dye in Silicone Resin or Polyvinyl acetate. When, on the other hand, the dye is adsorbed to zinc oxide fine crystals, λmax. of the absorption spectrum is observed at 600 mμ.<br/>These experimental results show that the "solvent effects" caused by a binder resin is more significant than those by an adsorbent (zinc oxide) at least in the zinc oxide-resin-DHNF·Na2 systems.<br/>A chromophore of the dye is supposed to be the carbonyl group attached to the naphthalene ring, while the adsorption site of the dye is considered to be the carboxyl group of the benzene ring. Since the chromophore is located far from the adsoption site, namely the surface of a zinc oxide crystal, and surrounded by the binder resin, it is supposed that the "solvent effects" by the binder resin are significant enough to shift the absorption maximum of the dye to longer wave lengths.
The Imaging Society of Japanの論文