Quantum Dot Layered Structure for Color Filtering Stability

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Solution Overview

Problem

Existing display devices using absorptive color filters face challenges in achieving high luminous efficiency and color reproducibility due to light absorption and degradation issues.

Innovation Solution

A layered structure comprising a photoluminescent layer with a quantum dot polymer composite, a light absorption layer with an absorptive color-filter material, and a silicon containing layer between the photoluminescent and light absorption layers, which absorbs non-converted excitation light and enhances light transmission from quantum dots.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a light absorption layer with absorptive color-filter material is disposed directly on the photoluminescent layer, then color filtering is achieved, but chemical and thermal degradation of the photoluminescent layer occurs

Engineering Contradiction:

Improvecolor filtering performanceVSAvoidphotoluminescent layer stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A silicon containing layer is introduced as an intermediary between the photoluminescent layer and the light absorption layer. This intermediate layer prevents direct contact between the potentially degrading absorptive color-filter material and the photoluminescent layer, thereby protecting the photoluminescent layer from chemical and thermal degradation while still allowing the light absorption layer to perform its color filtering function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If excitation light passes through the photoluminescent layer, then quantum dots emit light, but non-converted excitation light reduces luminous efficiency

Engineering Contradiction:

Improvequantum dot light emissionVSAvoidnon-converted excitation light

Core Design Contradiction:

Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The silicon containing layer is designed to absorb the non-converted excitation light that passes through the photoluminescent layer. By converting this previously wasted energy into absorbed energy (which can be dissipated as heat or re-emitted), the layer eliminates the harmful effect of excitation light leakage and improves overall luminous efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If the light absorption layer is disposed directly on the photoluminescent layer, then device structure is simplified, but light transmission from quantum dots is reduced

Engineering Contradiction:

Improvelayered structure complexityVSAvoidlight transmission from quantum dots

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The silicon containing layer serves as an intermediary that optimizes optical coupling between the photoluminescent layer and the light absorption layer. This intermediate layer improves light transmission from the quantum dots by providing a suitable refractive index transition and enhancing optical extraction, thereby increasing illumination intensity without significantly increasing device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 layered structure achieves improved luminous efficiency and color reproducibility, maintaining a high contrast ratio while reducing chemical and thermal degradation of the photoluminescent layer.

Implementation Method 1

the plurality of quantum dots are configured to absorb excitation light and emits light in a longer wavelength than the wavelength of the excitation light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

the absorptive color-filter material is configured to absorb the excitation light that passes through the photoluminescent layer

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 3

a silicon containing layer disposed between the photoluminescent layer and the light absorption layer, which absorbs non-converted excitation light and enhances light transmission from quantum dots

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12331236B2Layered structures and electronic devices including the same

Publication Date: 2025.06.17 SAMSUNG ELECTRONICS CO LTD

AI summary

A layered structure including a photoluminescent layer including a quantum dot polymer composite; a light absorption layer disposed on the photoluminescent layer, the light absorption layer including an absorptive color-filter material; and a silicon containing layer disposed between the photoluminescent layer and the light absorption layer, wherein the quantum dot polymer composite includes a first polymer matrix and a plurality of quantum dots dispersed in the first polymer matrix, and the plurality of quantum dots absorb excitation light and emits light in a longer wavelength than the wavelength of the excited light; and the absorptive color-filter material is dispersed in a second polymer matrix, and the absorptive color-filter material absorbs the excitation light that passes through the photoluminescent layer and transmits the light emitted from the plurality of quantum dots and an electronic device including the same.