Quantum Dot Polymer Composite for Display Luminous Efficiency
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Solution Overview
Problem
Current technologies face challenges in developing a quantum dot-polymer composite with enhanced properties suitable for various display devices, particularly in achieving improved luminous efficiency and color reproducibility while maintaining high brightness and wide viewing angles.
Innovation Solution
A photosensitive composition comprising quantum dots, a luminescent material, a carboxylic acid group-containing binder, a photopolymerizable monomer, and a photoinitiator, where the luminescent material overlaps spectrally with the quantum dots to enhance light absorption and emission, and the binder ensures dispersion stability without surface treatment, allowing for pattern formation in an environmentally friendly manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If quantum dots are used in display devices, then color reproducibility and luminous efficiency are improved, but absorption of excitation light is insufficient
Solution Approach 1:
The patent combines quantum dots with luminescent materials in a hybrid composite structure. The luminescent material absorbs excitation light and transfers energy to the quantum dots, which then emit light. This merging of absorption and emission functions resolves the contradiction by ensuring both sufficient light absorption and high luminous efficiency are achieved simultaneously.
Solution Approach 2:
The invention uses a composite material system consisting of quantum dots dispersed in a polymer matrix containing luminescent materials. This composite structure allows the luminescent material to handle excitation light absorption while quantum dots maintain their high-color-purity emission, thereby resolving the trade-off between absorption efficiency and luminous performance.
2Reliability
If quantum dot-polymer composite is prepared, then enhanced properties are achieved, but surface treatment is required which complicates the process
Solution Approach 1:
The patent employs a polymer matrix that inherently provides stabilization and dispersion of quantum dots without requiring additional surface treatment of the quantum dots themselves. The polymer system self-services by providing the necessary environment for quantum dot stability, eliminating complex surface modification steps and simplifying the manufacturing process while maintaining enhanced properties.
3Reliability
If quantum dots are dispersed in polymer matrix, then luminous efficiency is improved, but dispersion stability is poor without surface treatment
Solution Approach 1:
The invention creates a composite material where quantum dots are dispersed in a polymer matrix containing luminescent materials and functional additives. This composite structure provides both the luminous efficiency benefits of quantum dots and the dispersion stability of the polymer system, resolving the contradiction between achieving high luminous efficiency and maintaining stable dispersion without surface treatment.
Solution Approach 2:
The polymer matrix acts as an intermediary between quantum dots and the surrounding environment. It provides a stabilizing medium that maintains quantum dot dispersion stability while allowing the quantum dots to function at high luminous efficiency, eliminating the need for surface treatment of the quantum dots themselves.
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 quantum dot-polymer composite with increased absorption of excitation light, enhanced photoconversion efficiency, and improved luminous efficiency, maintaining high brightness and wide viewing angles without adverse effects on emitted light properties.
Implementation Method 1
The quantum dot absorbs at least a portion of light emitted from the luminescent material
Implementation Method 2
a luminescent material except for a quantum dot (e.g., a semiconductor nanocrystal particle)... the luminescent material includes a fluorophore
Implementation Method 3
a photopolymerizable monomer including a carbon-carbon double bond; and a photoinitiator
Data Source
AI summary
A photosensitive composition, a quantum dot polymer composite pattern prepared therefrom, and a layered structure and an electronic device including the same. The photosensitive composition includes plurality of quantum dots; a luminescent material other than a quantum dot; a carboxylic acid group containing binder; a photopolymerizable monomer having a carbon-carbon double bond; and a photoinitiator, and the luminescent material comprises a fluorophore, a nanosized inorganic phosphor, or a combination thereof.