Wavelength Conversion Component Using Organic Dyes for High CRI White Light
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Solution Overview
Problem
Conventional photoluminescence wavelength conversion components for generating white light with high Color Rendering Index (CRI) and lower Correlated Color Temperature (CCT) are expensive due to the high cost of orange and red phosphors, making them prohibitively expensive for many applications.
Innovation Solution
Incorporating blue light excitable YAG-type phosphors and organic fluorescent dyes, which require significantly less organic dye by weight compared to inorganic phosphors, to achieve high CRI while reducing costs, with the YAG-type phosphors emitting green to yellow light and the organic dyes emitting orange to red light, thereby generating white light with a CRI of 80 or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If orange and red inorganic phosphors are used to generate high CRI white light, then the Color Rendering Index is improved, but the cost of the wavelength conversion component increases significantly
Solution Approach 1:
The patent changes the material parameter from inorganic phosphor to organic fluorescent dye, which fundamentally alters the cost structure while maintaining the orange-red emission properties needed for high CRI. The organic dye achieves comparable color rendering performance at significantly lower material cost.
Solution Approach 2:
The patent creates a composite wavelength conversion component combining yellow-emitting YAG-type phosphor with orange-red emitting organic fluorescent dye. This composite approach achieves high CRI through the combination of different emission spectra while avoiding the high cost of pure inorganic red phosphor systems.
2Temperature
If orange and red inorganic phosphors are used to generate warm white light with lower CCT, then the Correlated Color Temperature is reduced, but the cost of the wavelength conversion component increases significantly
Solution Approach 1:
The patent changes the material system from expensive inorganic phosphor to cost-effective organic fluorescent dye, enabling warm white light generation at lower CCT without the prohibitive cost penalty associated with traditional inorganic phosphor-based solutions.
Solution Approach 2:
The patent employs organic fluorescent dyes that are significantly cheaper than inorganic phosphors, accepting that while organic materials may have different stability characteristics, the cost benefit makes them suitable for many commercial applications where extreme longevity is not the primary constraint.
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
This approach results in a cost-effective solution for generating high CRI white light, reducing the cost of the wavelength conversion components by 30% or more compared to traditional inorganic phosphor-based solutions, while maintaining or exceeding the performance of known components.
Implementation Method 1
The phosphor material may be provided as a layer on, or incorporated within a wavelength conversion component that is located remotely from the LED. Typically, the LED generates blue light and the phosphor(s) absorbs a percentage of the blue light and re-emits yellow, green, or a combination of green and yellow light.
Implementation Method 2
at least one blue light excitable orange to red light emitting organic fluorescent dye
Data Source
AI summary
A white light photoluminescence wavelength conversion component comprises at least one blue light excitable green to yellow light (510 nm to 570 nm) emitting yttrium aluminum garnet (YAG) type phosphor material and at least one blue light excitable orange to red light (585 nm to 670 nm) emitting organic fluorescent dye.