Photoconductor fatigue. 1. Photochemistry of hydrazone-based hole-transport molecules in organic layered photoconductors: spectroscopic characterization and effect on electrical properties

Pacansky, J.; Waltman, R. J.; Grygier, R. K.; Cox, Robert J.

doi:10.1021/cm00015a019

Cited by 12 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…358 The effects of CTL irradiation were clarified when it was found by Pacansky and co-workers that DEH underwent an efficient photocyclization to an indazole derivative, 1-phenyl-3-(4-(diethylamino)-1-phenyl)-1,3-indazole, when exposed to light with wavelength <480 nm (Figure 46). 359 The presumed intermediate is the dihydroindazole shown, and this is subsequently oxidized by molecular oxygen. Electrophotographic studies were carried out on a dual-layer OPC with a bisazo pigment based CGL and CTL of 40 wt % DEH in bisphenol A polycarbonate.…”

Section: Light Exposurementioning

confidence: 99%

“…An OPC with a CTL composition of DEH in bisphenol A polycarbonate was found to have an improved charge acceptance after irradiation, while an OPC with another CTM had decreased charge acceptance . The effects of CTL irradiation were clarified when it was found by Pacansky and co-workers that DEH underwent an efficient photocyclization to an indazole derivative, 1-phenyl-3-(4-(diethylamino)-1-phenyl)-1,3-indazole, when exposed to light with wavelength <480 nm (Figure ) . The presumed intermediate is the dihydroindazole shown, and this is subsequently oxidized by molecular oxygen.…”

Section: Opc Fatiguementioning

confidence: 99%

Section: Opc Fatiguementioning

confidence: 99%

See 2 more Smart Citations

Advances in Organic Photoconductor Technology

2009

View full text Add to dashboard Cite

Section: Light Exposurementioning

confidence: 99%

Section: Opc Fatiguementioning

confidence: 99%

See 1 more Smart Citation

Advances in Organic Photoconductor Technology

2009

View full text Add to dashboard Cite

“…These irreversible changes sometimes accompany a decrease in charge capacity, an increasing rate of dark decay, and an increased residual potential. These possible irreversible changes come from the IR irradiation from the corona charge [14], the irreversible oxidation and reduction in the photoconductors [15,16], the photonic oxidation of the charge transport material, any newly derived materials causing various traps, and curbing factors in the charge transport process. These factors diminish the lifetime of photoconductors.…”

Section: -4 Photofatiguementioning

confidence: 99%

Xerographic properties of metal/metal-free phthalocyanine composites in a double-layered photoconductor

Lee

Kim²

2009

Korean J. Chem. Eng.

View full text Add to dashboard Cite

The electrophotographic properties of a negatively charged double-layered photoconductor that consisted of y-type metal phthalocyanine (TiOPc) and x-type metal-free phthalocyanine (H 2 Pc) composites were studied. The undercoating layer (UCL) was fabricated by a dip-coating method with Al 2 O 3 and polyamide, and the charge transport layer (CTL) was prepared from N,N ' -Bis-(3-methylpenyl)-N,N '' -bis-(phenyl)-benzidine (TPD), polycarbonate (PC), and polyester (PE). In the charge generation layer (CGL), the dispersion state becomes more homogeneous with increasing amounts of non-metal phthalocyanine (H 2 Pc). The electrophotographic properties of the photoconductor were obtained by using photo-induced discharge curves (PIDC) of charge acceptance, dark decay, photosensitivity, and photofatigue. It was found that the initial charge potential was not dependent on the compositional ratio of the charge generating material. However, the dark decaying rates and the photosensitivity were proportional to the content of TiOPc in the organic photoconductors.

show abstract

“…Consequently, in doped polymers where the energy of the transport levels for holes is high owing to the low ionization energy of the donor molecules, carrier trapping caused by impurities is expected to be negligible. However, fatigue and a build-up of residual potential are commonly observed, and suggest that some of the transiting carriers do become trapped during the xerographic discharge process (Okuda et al 1982, Pacansky et al 1991.…”

Section: Introductionmentioning

confidence: 99%

Study of carrier transport in molecularly doped polymers by interrupted time-of-flight measurements

Németh-Buhin

Juhasz

1997

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Interrupted hole transit experiments were carried out on dispersions of DEH, BD, and DBH in polycarbonate, using electron beam excitation. The sweep field was switched off for intervals t between 10 ms and 10 s. On re-applying the field after more than 30 ms, the transit current initially rose to a value lower than that before interruption, but then gradually increased until holes began to arrive at the collecting electrode. The observations of a current plateau in uninterrupted transits, and of almost constant total charge collected irrespective of t, suggest negligible deep trapping. The results seem incompatible with monoenergetic polaron transport, but can be understood on the basis of the Gaussian disorder model. When the field is switched off, the hole population 'cools', slowly sinking into tail states. When the field is restored it is more quickly 're-heated' towards its original field-enhanced mean energy.

show abstract

Photoconductor fatigue. 1. Photochemistry of hydrazone-based hole-transport molecules in organic layered photoconductors: spectroscopic characterization and effect on electrical properties

Cited by 12 publications

References 6 publications

Advances in Organic Photoconductor Technology

Advances in Organic Photoconductor Technology

Xerographic properties of metal/metal-free phthalocyanine composites in a double-layered photoconductor

Study of carrier transport in molecularly doped polymers by interrupted time-of-flight measurements

Contact Info

Product

Resources

About