Pyrrolopyrrole Boron Near Infrared Absorption Filter
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Solution Overview
Problem
Current near infrared ray absorption substances used in solid-state imaging devices have limited transparency in the visible region due to broad absorption spectra, affecting the visibility and performance of these devices.
Innovation Solution
A composition featuring a near infrared ray absorption substance with a maximum absorption wavelength between 700 to 1,000 nm and a specific absorbance ratio at 550 nm, utilizing a pyrrolopyrrole skeleton or pyrrolopyrrole boron compounds, which are designed to minimize absorption in the visible spectrum, thereby enhancing transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional near infrared ray absorption substances are used, then near infrared absorption is achieved, but transparency in the visible region deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the maximum absorption wavelength (λmax) to be within 700-1000 nm and maintaining a specific absorbance ratio (A550/Aλmax ≤ 0.015). This quantitative parameter optimization shifts the absorption spectrum to achieve both strong near infrared absorption and high visible transparency, resolving the contradiction between these two optical properties.
Solution Approach 2:
The invention employs local quality by designing the absorption spectrum to have different characteristics in different wavelength regions. The substance exhibits strong absorption specifically in the near infrared region (700-1000 nm) while maintaining high transparency in the visible region (380-700 nm), creating region-specific optical properties that satisfy both requirements simultaneously.
2Quantity of substance
If broad absorption spectrum substances are used, then near infrared absorption coverage is improved, but visible region transparency deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the optical spectrum into distinct functional regions: the near infrared region (700-1000 nm) for absorption and the visible region (380-700 nm) for transparency. The absorption substance is designed to selectively absorb only in the near infrared segment while leaving the visible segment transparent, achieving spectrum segmentation that resolves the contradiction between absorption coverage and transparency.
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 provides a near infrared ray absorption filter with improved transparency in the visible region while maintaining effective absorption in the near infrared range, enhancing the performance of solid-state imaging devices and infrared sensors.
Implementation Method 1
a near infrared ray absorption substance of which a maximum absorption wavelength is in a wavelength range of 700 to 1,000 nm and a value obtained by dividing absorbance at a wavelength of 550 nm by absorbance at the maximum absorption wavelength is 0.015 or less
Data Source
AI summary
It is possible to provide a composition that has absorption in a near infrared region and that can form a film having transparency in a visible region. Provided are a cured film, a near infrared ray absorption filter, a solid-state imaging device, an infrared sensor, and a compound. Provided is a composition including: a near infrared ray absorption substance of which a maximum absorption wavelength is in a wavelength range of 700 to 1,000 nm and a value obtained by dividing absorbance at a wavelength of 550 nm by absorbance at the maximum absorption wavelength is 0.015 or less. In the near infrared ray absorption substance, a half-width of the maximum absorption wavelength is preferably 60 nm or less. The near infrared ray absorption substance is preferably a compound having a pyrrolopyrrole skeleton and more preferably a pyrrolopyrrole boron compound.