Nitrogen Compound Color Conversion Film for Blue Light Absorption
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Solution Overview
Problem
Existing light emitting diodes (LEDs) face challenges in color control and color gamut due to the difficulty in mixing phosphorescent substances, leading to unfavorable color rendering and high production costs, especially with cadmium-based quantum dots which have safety issues and reduced efficiency.
Innovation Solution
A nitrogen-containing compound with a specific aza-bodipy structure and fumaronitrile structure is used in a color conversion film to enhance blue light absorbance and achieve red fluorescence, allowing for color conversion with a single red dye instead of both green and red dyes, improving processability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used for color conversion, then color gamut is improved, but production cost increases and safety problems occur
Solution Approach 1:
The patent replaces expensive quantum dots with organic fluorescent compounds that can be synthesized at lower cost. The organic compounds achieve comparable color conversion performance without the high production costs and safety issues associated with quantum dot synthesis and handling
Solution Approach 2:
The patent modifies molecular parameters of organic fluorescent compounds by introducing specific substituents (electron-donating and electron-withdrawing groups) to optimize absorption and emission properties, achieving color conversion performance that matches or exceeds quantum dots while maintaining lower cost
2Illumination intensity
If quantum dots are used for color conversion, then color gamut is improved, but safety problems occur
Solution Approach 1:
The patent replaces potentially hazardous quantum dot materials with safe organic fluorescent compounds that do not contain toxic heavy metals, eliminating safety concerns while maintaining color conversion performance
Solution Approach 2:
The patent uses composite organic molecular structures combining electron-donating and electron-withdrawing groups to achieve stable, safe, and high-performance color conversion without relying on quantum dot materials
3Illumination intensity
If multiple phosphorescent substances are mixed for LED, then color rendering is improved, but color control becomes difficult
Solution Approach 1:
The patent extracts the color conversion function to a single organic fluorescent compound layer that converts blue LED light to yellow-green light, eliminating the complexity of mixing multiple phosphorescent substances while maintaining good color rendering
Solution Approach 2:
The patent achieves precise color control by modifying molecular parameters of the organic fluorescent compound through substituent selection, allowing systematic adjustment of emission wavelength and color coordinates without the variability issues of phosphor mixing
4Illumination intensity
If green and red dyes are used together for color conversion, then color rendering is improved, but processability decreases
Solution Approach 1:
The patent merges the functions of green and red dyes into a single organic fluorescent compound that emits yellow-green light, simplifying the manufacturing process to a single deposition step while achieving acceptable color rendering through the blue LED's spectral characteristics
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 compound increases the color conversion efficiency and reduces production costs by enhancing absorbance for blue light, enabling excellent color rendering with a single red dye, thus improving the color gamut and stability of the display apparatus.
Implementation Method 1
introducing a CN═CN (fumaronitrile) structure, capable of increasing absorbance for blue light
Implementation Method 2
capable of red fluorescence
Data Source
AI summary
The present specification relates to a nitrogen-containing compound, and a color conversion film, a backlight unit and a display apparatus including the same.