Optical Film Composition for Wavelength Conversion Efficiency
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Solution Overview
Problem
Existing lighting devices face efficiency reductions due to exposure to gases like oxygen, which affect the wavelength conversion efficiency of particles such as quantum dots used in emitting white light.
Innovation Solution
An optical film composition comprising a hydrophilic polymerizable compound, a hydrophobic polymerizable compound phase-separated after polymerization, wavelength conversion particles, and a polybutadiene compound, with the polybutadiene compound preventing oxidation of wavelength conversion particles by being included in the same region, thereby maintaining high wavelength conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wavelength conversion particles are used to emit white light, then wavelength conversion efficiency is improved, but exposure to oxygen reduces efficiency over time
Solution Approach 1:
The patent uses a composite polymer system comprising both hydrophilic polymerizable compounds (e.g., PEGDA, PMPA) and hydrophobic polymerizable compounds (e.g., LA, BD). This composite material structure creates a dual-phase environment where the hydrophobic phase provides oxygen barrier properties to protect wavelength conversion particles, while the hydrophilic phase ensures proper dispersion and maintains conversion efficiency.
Solution Approach 2:
The polybutadiene compound acts as an intermediary substance with specific solubility parameter (less than 10 (cal/cm³)¹/²) that mediates between the hydrophobic polymerizable compound and the wavelength conversion particles. It enhances the oxygen barrier effect while ensuring uniform distribution of particles within the matrix, thereby protecting efficiency without compromising dispersion.
2Reliability
If hydrophilic and hydrophobic polymerizable compounds are phase-separated, then oxygen barrier properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent controls the solubility parameter of the polybutadiene compound to be less than 10 (cal/cm³)¹/², which is a critical parameter threshold. This parameter control ensures spontaneous phase separation between hydrophilic and hydrophobic compounds during polymerization, creating the desired oxygen barrier structure without requiring complex external processing or additional manufacturing steps.
Solution Approach 2:
The patent incorporates the polybutadiene compound and hydrophobic polymerizable compound into the formulation before polymerization begins. This preliminary preparation ensures that phase separation occurs naturally during the curing process, establishing the oxygen barrier structure in advance without requiring subsequent complex manufacturing operations.
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 optical film achieves improved durability and optical characteristics by preventing oxidation of wavelength conversion particles, maintaining high efficiency over time and ensuring excellent adhesion with other layers.
Implementation Method 1
the polybutadiene compound preventing oxidation of wavelength conversion particles by being included in the same region, thereby maintaining high wavelength conversion efficiency
Implementation Method 2
a hydrophobic polymerizable compound phase-separated from the hydrophilic polymerizable compound after polymerization
Implementation Method 3
researches related to a lighting device emitting a white light by using wavelength conversion particles, for example, quantum dots, in which the color of light to be emitted varies depending on the size of particles
Data Source
AI summary
An optical film, a production method therefor, a lighting device and a display device are provided. The present application is capable of providing an optical film having excellent color purity and efficiency, the optical film being capable of providing a lighting device having excellent color characteristics. The optical film of the present application can stably maintain the above described excellent characteristics for a long period of time. The optical film of the present application can be used in various applications, including various lighting devices, photovoltaic cell applications, optical filters or photoconverters.