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Reduction of Photoconductor Fatigue With Properly Formulated Charge Transport Layers

IP.com Disclosure Number: IPCOM000102503D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Cox, RJ: AUTHOR [+3]

Abstract

4-Diethylaminobenzaldehyde diphenylhydrazone (DEH) represents a class of organic molecules which may be used for hole transport in organic layered photoconductors. DEH is contained in the charge transport layer (CTL) whose typical formulation is 40% by weight of DEH in a polymeric binder, and whose thickness is Z20 mm. The CTL is coated atop a charge generation layer (CGL) composed of an organic dye like chlorodiane blue, often embedded in a polymer host also. Unfortunately, when the photoconductor is exposed to 400-480 nm light, or blue light, DEH undergoes a photochemical reaction to an indazole derivative [*]. Associated with the photochemistry is an inability of the photoconductor to completely photodischarge.

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Reduction of Photoconductor Fatigue With Properly Formulated Charge Transport Layers

       4-Diethylaminobenzaldehyde diphenylhydrazone (DEH)
represents a class of organic molecules which may be used for hole
transport in organic layered photoconductors.  DEH is contained in
the charge transport layer (CTL) whose typical formulation is 40% by
weight of DEH in a polymeric binder, and whose thickness is Z20 mm.
The CTL is coated atop a charge generation layer (CGL) composed of an
organic dye like chlorodiane blue, often embedded in a polymer host
also.  Unfortunately, when the photoconductor is exposed to 400-480
nm light, or blue light, DEH undergoes a photochemical reaction to an
indazole derivative [*]. Associated with the photochemistry is an
inability of the photoconductor to completely photodischarge.  When
the same photoconductor is exposed to >520 nm light, or yellow light,
a photochemical reaction between the CGL and CTL ensues which effects
the electrical properties of the photoconductor in either of two
ways:  increasing residual voltage after exposure to an erase lamp,
and increasing the dark conductivity.  Which of these occurs depends
greatly upon the specific formulation of the photoconductor, i.e.,
the choice of charge transport molecules and the choice of polymers.

      Disclosed is a photoconductor formulation which provides
greater stability of the electrical properties of the photoconductor
to both blue and yellow light.  In a photoconductor using chlorodia...