Single Layer Photoreceptor High Mobility Charge Transport
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Solution Overview
Problem
The development of a single-layer electrophotographic photoreceptor is hindered by the difficulty in finding compatible hole and electron transport materials that are also compatible with the selected pigment and binder, requiring electrical compatibility, proper rheology, and resistance to agglomeration, which has led to the widespread use of costly and complex multi-layered devices.
Innovation Solution
A single-layer electrophotographic imaging member comprising a substrate with a combination of high mobility arylamine-based or terphenyl-based charge transport molecules and electron transport molecules, which are soluble in a common solvent and binder system, facilitating charge transport and image resolution while maintaining lower residual voltage and increased wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer photoreceptor is used, then manufacturing simplicity and cost efficiency are improved, but finding compatible hole and electron transport materials that work together with pigment and binder becomes difficult
Solution Approach 1:
The patent combines hole transport materials (arylamine-based or terphenyl-based) and electron transport materials into a single-layer photoreceptor structure, merging functions that were previously separated in multi-layer devices. This integration simplifies manufacturing while maintaining electrical compatibility through careful material selection and formulation.
Solution Approach 2:
The invention uses composite material systems where arylamine-based or terphenyl-based hole transport materials are combined with electron transport materials, pigments, and binders in a single layer. This composite approach allows all materials to be compatible within the same layer, solving the material compatibility problem while maintaining manufacturing simplicity.
2Reliability
If multi-layered photoreceptors are used, then material compatibility is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent merges the charge generation and charge transport functions into a single layer, eliminating the need for separate charge generation layer and charge transport layer. This reduces the number of layers and interfaces, simplifying the device structure while maintaining material compatibility through careful formulation of the single-layer composite.
3Ease of manufacture
If single-layer photoreceptors are used, then manufacturing cost is reduced, but charge transport performance may be compromised
Solution Approach 1:
The patent optimizes parameters such as the molecular structure of hole transport materials (using arylamine-based or terphenyl-based compounds with high mobility), the ratio of hole transport to electron transport materials, and the formulation composition to achieve excellent charge transport performance in a single layer, matching or exceeding multi-layer performance at lower cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a single-layer photoreceptor with improved electrical performance, sharper photoinduced discharge curves, and lower residual voltage, allowing for increased process speeds and longer device longevity with simpler and more cost-effective manufacturing.
Implementation Method 1
Upon exposure to light, charge is generated by the photoactive pigment
Implementation Method 2
the single layer comprises a terphenyl or arylamine-based transport molecule combined with electron transport materials to provide high mobility of charge through the bulk of the single layer imaging member
Implementation Method 3
The photoconductive layer is an insulator in the substantial absence of light so that electric charges are retained on its surface
Data Source
AI summary
The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. In particular, the present embodiments pertain to an improved imaging member comprising a single layer in which the single layer further comprises a combination of one or more high mobility hole (charge) transport molecules and electron transport molecules.