Photoconductive Layer Blue Light Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photoconductive imaging members lack sensitivity to blue light wavelengths and exhibit adverse performance changes over time, limiting their effectiveness in imaging and printing processes.
Innovation Solution
Development of layered photoconductive imaging members utilizing bis(tetrahalophenyl)biphenylbisimidazole or tetrahalobenzamidazolebenzene dimers, which are sensitive to blue light wavelengths between 350 to 450 nanometers, with a photogenerating layer deposited on a supporting substrate, enabling tunable electrical properties and stable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photoconductive imaging members are used, then they can perform basic imaging functions, but they lack sensitivity to blue light wavelengths and exhibit adverse performance changes over time
Solution Approach 1:
The patent changes the chemical composition parameters of the photogenerating layer by incorporating specific compounds (bis(tetrahalophenyl)biphenylbisimidazole and/or tetrahalobenzamidazolebenzene dimers) and adjusting their concentration ranges (0.01-10% by weight), which fundamentally alters the photosensitivity characteristics and temporal stability of the imaging member, enabling reliable blue light response and reduced performance degradation over time
Solution Approach 2:
The patent creates a composite photogenerating layer system by combining multiple components including the dimer compounds, charge transport materials (such as PVK, TPB, TCTA), and binder materials (such as polycarbonate, polyester), where each component contributes specific properties that collectively enhance both blue light sensitivity and long-term performance stability
2Illumination intensity
If photoconductive imaging members are designed for blue light sensitivity, then they can achieve wavelengths of 350-450 nanometers, but they may compromise other imaging performance characteristics
Solution Approach 1:
The patent optimizes the molecular structure parameters of the photogenerating compounds with specific halogen substitutions and conjugated systems that tune the absorption spectrum to blue wavelengths (350-450 nm) while simultaneously maintaining appropriate HOMO-LUMO energy levels that ensure stable charge generation and transport cycles, achieving both high photosensitivity and cyclic stability
Solution Approach 2:
The patent employs a composite formulation where the dimer compounds work synergistically with charge transport materials and stabilizing additives, creating a multi-component system where each material compensates for potential weaknesses, ensuring that blue light sensitivity enhancement does not compromise cyclic stability or other imaging performance characteristics
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 imaging members demonstrate excellent photosensitivity, cyclic stability, and acceptable dark decay characteristics, allowing for reliable performance in various imaging processes, including xerography, with improved sensitivity and durability.
Implementation Method 1
Photoconductive or photoresponsive imaging members are disclosed... which members possess in embodiments tunable and preselected electricals, acceptable dark decay characteristics, and high photosensitivity. Moreover, the imaging members of the present disclosure in embodiments can be selected for color xerographic imaging applications
Data Source
AI summary
A compound comprising a tetrahalobenzamidazolebenzene or a bis(tetrahalophenyl)biphenylbisimidazole of the alternative following formulas or dimers thereofwherein each of R1, R2, R3, R4, and R5 are the same or different and are independently selected from the group comprising hydrogen, alkyl, aryl, and halogen.