Solid Luminescent Dye Detection for Nanoscale Surface Defects
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Solution Overview
Problem
Conventional fluorescent penetrant inspection methods struggle to detect small scratches and defects on substrates with sizes of several tens of nanometers due to concentration quenching, limiting detection accuracy.
Innovation Solution
A method involving the accumulation of solid luminescent dye molecules with mechanochromism properties in regions of abnormal shapes on substrates, followed by illumination to capture fluorescent images, which enhances luminescence intensity even at high concentrations, allowing detection of small defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent penetrant inspection methods are used, then the inspection process is simple, but the detection precision for small defects is insufficient
Solution Approach 1:
The patent changes the chemical and physical parameters of the luminescent material by using solid luminescent dye molecules with mechanochromism properties instead of conventional liquid fluorescent penetrants. This parameter change enables the material to maintain high luminescence intensity even at high concentrations, resolving the concentration quenching problem and improving detection precision for small defects without requiring complex equipment
Solution Approach 2:
The patent utilizes the mechanochromism property of solid luminescent dye molecules, which exhibit color or luminescence changes in response to mechanical stress or aggregation state. This color change mechanism allows the material to provide strong luminescence signals when accumulated in defect regions, enhancing the detection precision of small defects while maintaining simple inspection equipment
2Illumination intensity
If solid luminescent dye molecules are accumulated in high concentration, then the luminescence intensity is enhanced, but concentration quenching occurs in conventional materials
Solution Approach 1:
The patent changes the aggregation behavior parameter of luminescent molecules by using solid luminescent dye molecules with mechanochromism properties. These molecules maintain stable luminescence characteristics even in aggregated states at high concentrations, eliminating the concentration quenching effect and enabling enhanced luminescence intensity with improved reliability
Solution Approach 2:
The patent employs solid luminescent dye molecules that combine multiple functional properties: high concentration stability, mechanochromism, and strong luminescence. This composite material approach allows the system to achieve both high luminescence intensity and stability simultaneously by selecting materials with specific molecular structures that resist concentration quenching
3Measurement precision
If the detection method can identify defects of several tens of nanometers, then the measurement precision is improved, but the complexity of the inspection system increases
Solution Approach 1:
The patent uses the mechanochromism property of solid luminescent dye molecules to create strong, distinguishable luminescence signals in defect regions. This optical contrast mechanism enables high-precision detection of defects at several tens of nanometers scale using simple optical inspection equipment, avoiding the need for complex imaging systems
Solution Approach 2:
The patent creates an optical copy or representation of the defect distribution through luminescence imaging. The solid luminescent dye molecules accumulate in defect regions and produce luminescence patterns that replicate the defect morphology, allowing simple optical systems to detect nanometer-scale defects with high precision by analyzing the luminescence image
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
Accurate detection of abnormal shapes and defects down to several tens of nanometers is achieved without requiring large equipment, enhancing detection speed and precision.
Implementation Method 1
the fluorescent image of the solid luminescent dye molecules is acquired by irradiating the region with illumination
Implementation Method 2
AIE is a phenomenon that Tang et al. reported to occur in pentaphenylsilole in 2001. This molecules indicate the opposite behavior to that of conventional organic dyes in which no luminescence phenomenon is observed in solution, but luminescence intensity increases in aggregation or in a solid state.
Data Source
AI summary
A method for observing a surface includes a) and b). At the a), a material including at least one or more solid luminescent dye molecules is accumulated in a region having an abnormal shape in a substrate or in a structure on the substrate. At the b), the region having the abnormal shape in the substrate or in the structure on the substrate is irradiated with illumination light to acquire the fluorescent image of the solid luminescent dye molecules.