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High Xerographic Gain Chlorodiane Blue, a Carrier Generation Dye used in Electrophotography

IP.com Disclosure Number: IPCOM000108520D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Pacansky, J: AUTHOR [+2]

Abstract

Disclosed is a process for the treatment of a chlorodiane blue carrier generation layer with acidic solvent to insure high xerographic gain.

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High Xerographic Gain Chlorodiane Blue, a Carrier Generation Dye used in Electrophotography

       Disclosed is a process for the treatment of a chlorodiane
blue carrier generation layer with acidic solvent to insure high
xerographic gain.

      Polyazo pigments like chlorodiane blue, the structure of which
is shown in Fig. 1, are used as carrier generation molecules in
electrophotographic applications.  For example, in organic layered
photoconductors, the carrier generation molecules are exposed to
long-wavelength light to generate electron-hole pairs  which then are
used to discharge the photoconductor.  The xerographic gain, defined
as the number of mobile carriers generated per absorbed photon, is
then an important parameter in electrophotographic applications.

      The carrier generation layer is typically  formed by coating
chlorodiane blue from an amine-based solvent, then "dropped" from
solution onto a substrate by the addition  of a non-solvent, like
tetrahydrofuran directly on the coating line.  The optical absorption
spectrum of such a carrier generation layer is shown in Fig. 2 as
Trace 1, and has an optical absorption band maximum at 564 nm.  The
xerographic gain at this wavelength is N0.05.

      By treating the surface of the carrier generation layer
(containing chlordiane blue) with slightly acidic solvent, for
example, 20 mequivalents/gram acid in tetrahydrofuran, prior to
coating the charge transport layer, a long wavelength shi...