Infrared Cut-Off Filter Composition for Oxidation-Stable NIR Blocking
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Solution Overview
Problem
Existing solid-state image sensors face challenges in accurately distinguishing between visible light and infrared light, leading to reduced detection accuracy due to the detection of infrared light by photoelectric conversion elements.
Innovation Solution
Incorporation of an infrared cut-off filter using a cyanine dye with a tris(pentafluoroethyl) trifluorophosphate anion and a cation having a polymethine and a nitrogen-containing heterocycle, combined with an acrylic polymer, to effectively absorb near-infrared light, and a barrier layer to prevent oxidation, enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an infrared cut-off filter is used to block infrared light, then detection accuracy of visible light is improved, but the filter material may oxidize and degrade over time
Solution Approach 1:
A barrier layer is introduced as an intermediary between the infrared cut-off filter and the external environment. This barrier layer specifically prevents oxygen from reaching the cyanine dye in the filter, thereby preventing oxidation while maintaining the filter's infrared blocking function. The barrier layer acts as a protective mediator that isolates the sensitive filter material from oxidizing conditions.
Solution Approach 2:
The solution employs a composite structure combining the infrared cut-off filter (containing cyanine dye) with a barrier layer. This composite material system leverages the infrared blocking properties of the cyanine dye while the barrier layer provides oxidation protection. The combination of these two materials creates a system that simultaneously achieves both detection accuracy and reliability.
2Use of energy by moving object
If a cyanine dye is used in the infrared cut-off filter, then near-infrared light absorption is enhanced, but the dye is susceptible to oxidation which reduces its absorbance properties
Solution Approach 1:
The barrier layer creates an inert environment by blocking oxygen access to the cyanine dye. This protective environment prevents oxidative degradation of the dye molecules, preserving their near-infrared absorption properties over time. The barrier layer effectively excludes the harmful oxidizing atmosphere from contacting the sensitive dye material.
Solution Approach 2:
The barrier layer serves as a protective intermediary between the cyanine dye and oxygen in the environment. It selectively blocks oxygen transport to the dye while allowing the dye to maintain its optical absorption function. This intermediary protection preserves the dye's absorbance properties without interfering with its near-infrared blocking capability.
3Manufacturing precision
If the infrared cut-off filter is made with specific polymer structures, then manufacturing precision is improved, but the filter becomes more complex to produce
Solution Approach 1:
The filter structure is segmented into distinct functional layers: the infrared cut-off layer containing cyanine dye and the separate barrier layer for oxidation protection. This segmentation allows each layer to be optimized and manufactured independently with specific precision requirements, rather than requiring the entire filter to meet all specifications simultaneously, thereby managing production complexity while maintaining overall precision.
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 infrared cut-off filter significantly improves the detection accuracy of visible light by reliably blocking near-infrared light, while maintaining the integrity of the cyanine dye's absorbance properties and preventing oxidation, thus enhancing the overall performance of the solid-state image sensor.
Implementation Method 1
The infrared cut-off filter absorbs infrared light to cut off infrared light which may otherwise be detected by the respective photoelectric conversion elements
Implementation Method 2
a barrier layer to prevent oxidation, enhancing detection accuracy
Data Source
AI summary
An infrared cut-off filter including a cyanine dye including a tris(pentafluoroethyl) trifluorophosphate anion and a cation having a polymethine and a nitrogen-containing heterocycle located at each end of the polymethine, and an acrylic polymer having a unit structure of formula (1).