Fluorinated Pyrromethene-Boron Color Conversion for Durable Green Emission
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Solution Overview
Problem
Existing organic light-emitting materials for color conversion in displays and illumination systems suffer from inadequate color reproducibility, light emission efficiency, and durability, particularly in terms of green emission with high color-purity and durability.
Innovation Solution
A pyrromethene-boron complex with specific fluorine-containing groups is used as a color conversion material, which includes a compound represented by general formula (1) with at least two groups containing a fluorine atom, enhancing durability and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cyan emission LEDs are used to reduce color mixing, then color rendering accuracy improves, but the LEDs cannot emit sufficient blue light for displaying blue images
Solution Approach 1:
A yellow phosphor is introduced as an intermediary substance between the cyan LED and the final light output. The cyan LED excites the yellow phosphor, which then emits yellow light that combines with the remaining cyan light to produce white light. This intermediary approach allows the cyan LED to indirectly contribute to blue display capability through color conversion while maintaining accurate color rendering.
Solution Approach 2:
The patent changes the emission wavelength parameter of the LED from traditional blue (450-470 nm) to cyan (470-505 nm). This parameter shift allows the LED to avoid excessive blue light emission that causes color mixing, while still enabling blue display capability through the combination with yellow phosphor conversion. The wavelength parameter is optimized to balance color rendering accuracy with blue light availability.
2Adaptability or versatility
If red phosphors with long wavelengths are used, then red color display capability improves, but color rendering accuracy of other colors deteriorates
Solution Approach 1:
The patent applies local quality by using different phosphor materials with specific wavelength characteristics in different regions of the color spectrum. A red phosphor with optimized wavelength (610-680 nm) is selected to provide adequate red display capability while minimizing interference with other color renderings. The phosphor composition is locally optimized to balance red capability with overall color accuracy.
3Adaptability or versatility
If green phosphors with short wavelengths are used, then green color display capability improves, but color rendering accuracy of other colors deteriorates
Solution Approach 1:
The patent employs local quality by selecting a green phosphor with specifically optimized wavelength (500-560 nm) that provides sufficient green display capability while minimizing negative impact on other color renderings. The phosphor's emission characteristics are locally tuned to achieve the right balance between green capability and overall color rendering accuracy.
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 pyrromethene-boron complex achieves high color purity and durability, improving color reproducibility and extending the lifespan of light sources in displays and illumination systems.
Implementation Method 1
a yellow phosphor that converts a portion of the cyan light to yellow light
Data Source
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AI summary
A pyrromethene-boron complex according to an aspect of the present invention is a compound represented by general formula (1). The pyrromethene-boron complex is used in a color conversion composition. The color conversion composition and a color conversion film containing the same are used in a light source unit, a display, and an illumination apparatus. In general formula (1), X is C-R7 or N. R1 to R9 are each a group selected from prescribed groups, where R2 and R5 are selected from among the groups other than a substituted or unsubstituted aryl group and a substituted or unsubstituted heteroaryl group. R2 and R5 are groups not containing a heteroaryl group with at least two condensed rings. At least one of R1 to R6 is a group containing a fluorine atom.