Perimidine-Substituted Squarylium Dye for Near-Infrared Image Recording
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Solution Overview
Problem
Current image forming materials lack effective methods for recording invisible information that can be easily readable under specific conditions, particularly in the near-infrared region, while maintaining long-term stability and light fastness.
Innovation Solution
Development of an image forming material incorporating a perimidine-substituted squarylium dye with a specific structure, which shows distinct X-ray diffraction peaks and is processed into particles with controlled size for enhanced infrared color development and light fastness, allowing for invisible information recording and easy readout using near-infrared radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional image forming materials are used, then visible information can be recorded, but invisible information recording capability is lacking
Solution Approach 1:
The patent employs a perimidine-substituted squarylium dye that exhibits selective absorption in the near-infrared region (750-1000 nm) while remaining invisible to the human eye. This color change principle allows the material to record invisible information that can be detected by silicon-based light-sensitive elements, resolving the contradiction between visibility and detectability
Solution Approach 2:
The invention specifies precise structural parameters for the squarylium dye (formula I) and controls particle morphology parameters (size distribution, crystallinity) to achieve optimal near-infrared absorption. By controlling these parameters, the material enables invisible information recording while maintaining reliable detection through near-infrared radiation
2Adaptability or versatility
If near-infrared absorbing dye is used for invisible information recording, then invisibility is achieved, but long-term stability and light fastness are insufficient
Solution Approach 1:
The patent creates a composite structure by incorporating the perimidine-substituted squarylium dye into particles with controlled morphology and crystallinity. This composite approach combines the near-infrared absorption capability of the dye with the stabilizing effect of the particle structure, achieving both invisibility and long-term stability
Solution Approach 2:
The invention applies local quality control by ensuring uniform distribution and orientation of the squarylium dye molecules within the particle structure. This localized structural control protects the dye from degradation while maintaining its near-infrared absorption properties, thereby improving light fastness and long-term stability
3Manufacturing precision
If particle size is reduced for better image quality, then resolution is improved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent employs preliminary action by pre-forming particles with controlled size and morphology before incorporating the squarylium dye. This sequence ensures that the particle structure is already optimized for the desired application, making the subsequent dye incorporation process easier and more controllable
Solution Approach 2:
The invention controls multiple parameters simultaneously (particle size, size distribution, crystallinity, morphology) through optimized synthesis conditions. By carefully adjusting these parameters, the patent achieves narrow size distribution and uniform morphology, resolving the contradiction between manufacturing precision and ease of manufacture
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 material achieves both invisibility of recorded information and easy readout, ensuring long-term stability and high light fastness, with the perimidine-substituted squarylium dye providing high absorbance in the near-infrared region and low absorbance in the visible region, meeting specific color difference and reflectance criteria.
Implementation Method 1
an image forming material which has absorption in the near-infrared region of 750 to 1,000 nm and can be detected by a silicon-utilized light-sensitive element
Implementation Method 2
shows diffraction peaks at least at Bragg angles (2θ±0.2°) of 17.7°, 19.9°, 22.1°, 23.2° and 24.9° in its X-ray powder diffraction spectrum measured by irradiation with X rays
Data Source
AI summary
An image forming material includes a perimidine-substituted squarylium dye that has a structure represented by the following formula (I) and shows diffraction peaks at least at Bragg angles (2θ±0.2°) of 17.7°, 19.9°, 22.1°, 23.2° and 24.9° in its X-ray powder diffraction spectrum measured by irradiation with X rays generated from a Cu target with a wavelength of 1.5405 angstroms: