Photo-Reactive QD Composition With Low-Viscosity Structural Scattering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing quantum dot (QD) inks face issues with sedimentation and increased viscosity due to the use of TiO2 scattering particles, leading to inefficiencies in ink-jet printing and optical properties.
Innovation Solution
A photo-reactive composition is developed without or with reduced TiO2 scattering particles, achieving higher External Quantum Efficiency (EQE) and lower Blue Leakage (BL), with improved optical properties, compatibility, and chemical stability, while maintaining lower viscosity and flexibility for ink design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TiO2 scattering particles are added to QD ink, then light scattering performance is improved, but viscosity increases and sedimentation occurs
Solution Approach 1:
The patent removes TiO2 scattering particles from the QD ink formulation entirely, achieving the technical effect of reduced viscosity and eliminated sedimentation while maintaining adequate light scattering performance through alternative mechanisms in the cured film structure
Solution Approach 2:
The patent changes the physical and chemical parameters of the ink system by eliminating inorganic scattering particles and adjusting the polymer matrix composition (using specific acrylate monomers and oligomers), which fundamentally alters the light scattering mechanism from particle-based to structure-based scattering in the cured state
2Illumination intensity
If TiO2 scattering particles are added to QD ink, then light scattering performance is improved, but sedimentation occurs leading to printing issues
Solution Approach 1:
The patent extracts and removes TiO2 scattering particles from the formulation, eliminating the sedimentation problem that causes printing reliability issues while maintaining light scattering performance through the cured film's structural properties
Solution Approach 2:
The patent introduces a specifically designed polymer matrix system (comprising acrylate monomers and oligomers with controlled molecular weight and functional groups) that acts as an intermediary to provide light scattering through the cured film structure rather than through suspended particles, thereby eliminating sedimentation
3Device complexity
If TiO2 scattering particles are reduced or eliminated, then viscosity decreases and printing flexibility improves, but light scattering performance may be compromised
Solution Approach 1:
The patent changes the state of the system from liquid ink with suspended scattering particles to cured film with structural scattering properties, achieving low viscosity in the printable state while maintaining light scattering performance in the final device state
Solution Approach 2:
The patent utilizes the phase transition from liquid (printable) to solid (cured) state to achieve different functional requirements: low viscosity in liquid state for easy printing, and structured light scattering in solid state for optimal optical performance
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 composition achieves higher haze values and EQE without scattering particles, enhances compatibility and chemical stability, and supports low curing temperatures, ensuring high resolution and environmental sustainability.
Implementation Method 1
containing a photopolymerization initiator, wherein said composition shows a haze value of 15% or less in the liquid state and is configured to show the haze value of more than 15% in the cured state
Implementation Method 2
comprising red emission type nanocrystals
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention relates to a composition comprising at least one light emitting moiety.