Quantum Dot Color Conversion Filter Sensitized Polymerization

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Solution Overview

Problem

Current methods for photochemical polymerization of quantum dot-based color conversion filters face challenges with high quantum dot loading, leading to inhibited matrix curing and inhomogeneous distribution/aggregation of quantum dots, which affects the quality and efficiency of color conversion filters in display applications.

Innovation Solution

A composition comprising a monomer, a photo initiator, a sensitizer, and quantum dots is used for photochemical polymerization, where the sensitizer absorbs light and transfers energy to the initiator to promote radical species formation for curing, allowing polymerization to occur outside the quantum dot absorption region, thereby achieving homogeneous distribution and preventing aggregation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high quantum dot loading is used in the film, then color conversion efficiency is improved, but matrix curing is inhibited and quantum dot distribution becomes inhomogeneous

Engineering Contradiction:

Improvecolor conversion efficiencyVSAvoidmatrix curing quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A sensitizer is introduced as an intermediary substance that absorbs light and transfers energy to the photopolymerization initiator. This mediator enables efficient energy transfer even in the presence of high quantum dot loading, allowing matrix curing to proceed effectively without being inhibited by the quantum dots' light absorption properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the optical parameters of the polymerization system by using a sensitizer with specific absorption characteristics. The sensitizer is selected to have absorption bands that do not overlap with the quantum dot emission bands, enabling selective energy transfer while maintaining quantum dot functionality and avoiding aggregation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If high quantum dot loading is used in the film, then color conversion efficiency is improved, but quantum dot aggregation occurs

Engineering Contradiction:

Improvecolor conversion efficiencyVSAvoidquantum dot distribution homogeneity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The sensitizer acts as an intermediary that facilitates uniform energy distribution throughout the polymer matrix without causing local overheating or aggregation. By transferring energy through a controlled mechanism, the sensitizer prevents quantum dots from clustering while maintaining high loading concentrations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the energy transfer parameters by introducing a sensitizer with specific optical properties. This changes the way light energy is distributed in the system, promoting uniform quantum dot dispersion even at high loadings by avoiding localized energy concentration that would lead to aggregation.

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

This approach enables efficient polymerization of quantum dot-based color conversion filters with high quantum dot loading, ensuring homogeneous distribution and transparent, reliably cured matrices, even in deep layers, without compromising optical quality or stability.

Implementation Method 1

the sensitizer absorbs light and transfers energy to the initiator to promote radical species formation

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

the sensitizer absorbs light and transfers energy to the initiator

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 3

photochemical polymerization of quantum dot-based color conversion filter matrices

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS20240182782A1Materials, process and fabrication technology for quantum dot color conversion filter by sensitized polymerization

Publication Date: 2024.06.06 SONY GROUP CORP

AI summary

The present disclosure relates to a composition comprising (i) a monomer, (ii) a photo initiator for photochemical polymerization of the monomer, (iii) a sensitizer, and (iv) quantum dots. The present disclosure further relates to a method for photochemical polymerization of quantum dot-based color conversion filter matrices and/or for matrix curing, comprising the use of a combination of a sensitizer and a photo initiator. The present disclosure also relates to thin layers and a quantum dot-based color conversion filter matrix comprising a thin layer. Moreover, the present disclosure relates to the use of a thin layer as quantum dot-based color conversion filter and to a device comprising a quantum dot-based color conversion filter.