Improved organophotoreceptors have:
(a) a charge transport compound having the formula
1
where R
1
is hydrogen, a branched or linear alkyl group, a branched or linear unsaturated hydrocarbon group, an ether group, or an aryl group; and
R
2
and R
3
independently have a structure of:
2
in which Ar is selected form the group consisting of;
3
R
4
is a hydrogen, or an aromatic group;
(b) a charge generating compound; and
(c) an electrically conductive substrate.
and 2D) carbazole based hemicyanines, where methyl pyridinium, methyl indolium and methyl benzothiazolium were used as acceptor group, were synthesized by Knoevenagel condensation. One-photon absorption, fluorescence and two-photon fluorescence spectra were investigated. The experimental results indicated that the different ionic acceptors affect their one-photon and two-photonproperties. Among them