Core-shell dye for CMOS near-infrared absorption

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Solution Overview

Problem

Existing near-infrared absorbing films for CMOS image sensors face challenges in achieving high absorption intensity while maintaining durability, as organic dyes tend to have lower durability compared to inorganic dyes and require higher amounts, affecting processability and film thickness.

Innovation Solution

A core-shell dye is developed, comprising a croconium-based organic dye core and a rotaxane-based macrocyclic shell, which enhances durability and shifts the maximum absorption peak to the near-infrared wavelength region, improving matching and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If organic dyes are used to achieve high near-infrared absorption intensity, then absorption performance is improved, but durability deteriorates

Engineering Contradiction:

Improvenear-infrared absorption intensityVSAvoiddurability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent applies the nested doll principle by creating a core-shell structure where the organic dye core is encapsulated within a protective shell. The core contains the croconium-based organic dye for high near-infrared absorption, while the shell provides durability and stability. This nested configuration allows the inner core to perform its absorption function while being protected by the outer shell, thereby resolving the contradiction between achieving high absorption intensity and maintaining durability.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent employs composite materials by combining organic dye molecules with a protective matrix or shell material. The composite structure integrates the optical properties of the organic dye (high near-infrared absorption) with the mechanical and chemical stability of the shell material. This composite approach enables the system to simultaneously achieve both high absorption intensity and improved durability that neither component could provide alone.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If higher amounts of organic dye are used to compensate for lower durability, then absorption performance is maintained, but processability deteriorates

Engineering Contradiction:

Improveabsorption performanceVSAvoidprocessability

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The nested core-shell structure allows concentrated organic dye to be encapsulated in discrete particles, enabling high absorption performance with lower overall dye loading. The shell acts as a carrier that delivers the dye's optical function while being processable as a stable composite material, thus maintaining absorption performance without requiring excessive dye amounts that would compromise processability.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The shell structure provides a flexible matrix that can be formulated into processable compositions. The shell material serves as a binder or dispersant that facilitates uniform distribution and stable incorporation of the organic dye, improving ease of manufacture while maintaining the required absorption performance through optimized shell thickness and composition rather than increasing dye content.

Inventive Principle:

Principle #30Flexible shells and thin films

3Illumination intensity

If higher amounts of organic dye are used, then absorption performance is maintained, but film thickness increases

Engineering Contradiction:

Improveabsorption performanceVSAvoidfilm thickness

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

The nested core-shell design concentrates the absorbing organic dye into discrete particles with high loading efficiency. This allows achieving the required absorption performance with thinner films because the dye is delivered more efficiently per unit volume. The shell provides structural integrity and optical stability, enabling reduced film thickness while maintaining absorption performance.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent utilizes parameter changes by optimizing the shell thickness, composition, and refractive index to enhance light interaction with the embedded organic dye. By adjusting these parameters, the system achieves higher absorption efficiency per unit thickness, allowing reduced film thickness while maintaining the required absorption performance.

Inventive Principle:

Principle #35Parameter changes

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 core-shell dye exhibits high near-infrared absorption intensity with improved durability, allowing for thinner films and better processability, matching or exceeding inorganic dyes in absorption performance while reducing the amount of dye required.

Implementation Method 1

Methodology Applied

Scientific EffectNear-infrared absorption: Absorption (EM radiation)

Implementation Method 2

Methodology Applied

Scientific EffectPhysical protection through encapsulation: Physical Containment

Data Source

PatentUS12091553B2Core-shell dye, near-infrared absorbing composition including the same, and near-infrared absorbing film

Publication Date: 2024.09.17 SAMSUNG SDI CO LTD

AI summary

A core-shell dye, a near-infrared absorbing resin composition including the same, a near-infrared absorbing film, an optical filter, and a CMOS image sensor, the core-shell dye includes a core represented by Chemical Formula 1; and a shell surrounding the core, the shell being represented by Chemical Formula 2;