Polycyclic Aromatic Compound for High Purity Color Conversion
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Solution Overview
Problem
Current color conversion compositions for liquid crystal displays and LED lighting face challenges in achieving high color reproduction accuracy and durability, particularly in maintaining green and red light emission with high purity and stability.
Innovation Solution
A polycyclic aromatic compound with specific properties, including a peak emission wavelength between 500 nm to 750 nm, a HOMO level of not more than −5.7 eV, and delayed fluorescence, is used in a color conversion composition, which includes a binder resin and optionally a barrier film, to enhance color conversion efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor nanocrystals are used as color conversion material, then color reproduction accuracy is improved through reduced emission spectrum half-width, but durability deteriorates due to sensitivity to heat, moisture, and oxygen
Solution Approach 1:
The patent changes the material parameter from inorganic semiconductor nanocrystals to organic luminescent materials with specific molecular structures (compounds of formula 1 or 2), achieving both narrow emission half-width for high color purity and inherent stability against heat, moisture, and oxygen that inorganic materials lack
Solution Approach 2:
The patent creates a composite color conversion composition combining the organic luminescent material with a binder resin and encapsulating it within a barrier film structure, achieving both high color purity and protection against environmental degradation
2Reliability
If organic luminescent materials are used as color conversion material, then durability is improved through resistance to heat, moisture, and oxygen, but color reproduction accuracy deteriorates due to insufficient color purity
Solution Approach 1:
The patent introduces specific structural features at local positions within the organic luminescent material molecules (rigid polycyclic aromatic hydrocarbon cores with specific substituents), creating localized electron distribution patterns that produce narrow emission spectra and high color purity while maintaining overall molecular stability
Solution Approach 2:
The patent optimizes molecular parameters including HOMO level (not more than −5.7 eV) and emission peak wavelength (500-750 nm) to achieve both high color purity through narrow half-width emission and sufficient durability against environmental factors
3Ease of manufacture
If conventional organic luminescent materials are used, then ease of manufacture is maintained, but color reproduction accuracy deteriorates due to insufficient green light emission purity
Solution Approach 1:
The patent changes the emission spectral parameter by designing molecules with specific rigid polycyclic aromatic hydrocarbon structures, achieving narrow emission half-width (high green light purity) while maintaining compatibility with conventional manufacturing processes for organic luminescent materials
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 polycyclic aromatic compound-based color conversion composition achieves high color reproduction accuracy and durability by reducing singlet oxygen generation, thereby extending the lifespan of the luminescent material and maintaining color purity over time.
Implementation Method 1
a polycyclic aromatic compound which is observed to emit light having a peak wavelength in a range of 500 nm to 750 nm when exposed to excitation light and emits delayed fluorescence
Data Source
AI summary
A polycyclic aromatic compound according to one aspect of the present invention is a compound which, when exposed to excitation light, is observed to emit light having a peak wavelength in the range of 500 nm to 750 nm, has a HOMO level of not more than −5.7 eV, and emits delayed fluorescence.