Phthalocyanine charge generation

Fig. 6. Classes of charge-generating dyes and pigments (a) perylenes, (b) thiapyrylium, (c) phthalocyanines, (d) squaiaines, and (e) a2o. R and Z are organic...

Vanadyl phthalocyanine (VOPc) has three crystal forms. Phase I has the major absorption at 725 nm and Phase II at 840 nm [39a]. Figure 27 shows the absorption spectra of Phases II, V, and XI. A dual-layer xerographic photoreceptor with VOPc as the charge generation material had a high-field photogeneration efficiency of 0.2 from 400 to 900 nm [39b]. The effects of molecular structure on aggregation have been studied with t-butyl-substituted VOPcs [39c]. Such substitution increases... 

Recently, Fuji Xerox armounced a new series of printers, with hydroxygallium phthalocyanine as the charge generating material. Hydroxygallium phthalocyanine is reported to have several crystal forms, with the V form as the most photosensitive. The photosensitivity of the V form hydroxygallium phthalocyanine is comparable to that of Y form titanyl phthalocyanine, but is independent of the humidity l... 

Recently, Fuji Xerox announced a new series of printers, using hydroxygaUium phthalocyanine as the charge-generating material. HydroxygaUium phthalocya-... 

Most of the studies on push-pull phthalocyanines have been carried out by means of Electric Field Induced Second Harmonic (EFISH) Generation experiments in solution. Since only one experimental condition is favorable for EFISH, namely, parallel polarizations for all optical and static fields, these experiments lead to only one observable the vector component along the charge transfer axis assuming that the dipole moment vector and the vector part of the third-rank tensor along tlie molecular z-axis are collinear). 

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