Multi-Source White Light Device for Color Rendering
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Solution Overview
Problem
Conventional white-light emitting devices using a blue LED and yellow phosphor struggle with quantum deficits, efficiency decreases, and limited color rendering, making it difficult to express natural colors and control color temperature effectively.
Innovation Solution
A light emitting device utilizing multiple white light sources with specific color coordinates and phosphors, including a blue LED and phosphors with defined wavelength ranges, to achieve high color rendering and efficiency, allowing for the emission of white light with various color temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a blue LED with yellow phosphor is used to generate white light, then the device is simple to operate and low cost, but the color rendering is poor and color temperature control is difficult
Solution Approach 1:
The invention divides the white light generation into multiple independent light sources, each with specific color coordinates. Instead of using a single blue LED with phosphor, the patent employs three separate white light sources (first, second, and third white light sources) with different color temperatures, allowing independent control of each source to achieve precise color mixing and rendering.
Solution Approach 2:
The invention uses composite phosphor systems in each white light source. For example, the first white light source uses a blue LED with multiple phosphors including yellow phosphor (560-580nm) and orange phosphor (590-610nm). This composite approach enables precise control over the spectral composition and color rendering while maintaining manufacturing simplicity.
2Device complexity
If a blue LED with yellow phosphor is used to generate white light, then the device structure is simple, but the color temperature control capability is limited
Solution Approach 1:
The invention introduces dynamic control capability by independently adjusting the light output of each white light source. The control unit can vary the intensity of each source (first, second, and third white light sources) to dynamically change the overall color temperature of the combined white light, enabling adaptation to different lighting conditions and applications.
Solution Approach 2:
By segmenting the white light generation into multiple controllable sources with different color characteristics, the system gains versatility in color temperature control while keeping each individual source structurally simple, thus resolving the contradiction between device complexity and adaptability.
3Ease of manufacture
If quantum deficits and re-emission efficiency losses occur in phosphor-based white light generation, then the manufacturing cost is low, but the overall efficiency decreases
Solution Approach 1:
The invention optimizes the spectral parameters of the phosphors used in each white light source. By selecting phosphors with specific emission wavelengths (yellow phosphor 560-580nm, orange phosphor 590-610nm, red phosphor 610-650nm) and matching them with appropriate blue LED excitation sources, the system maximizes the conversion efficiency while maintaining cost-effectiveness.
Solution Approach 2:
The use of composite phosphor systems with carefully selected wavelength ranges reduces energy losses by minimizing quantum deficits. The multi-phosphor approach in each white light source creates a more efficient spectral matching between excitation and emission, improving overall energy conversion efficiency while keeping manufacturing costs low.
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 device achieves high color rendering, high efficiency, and low costs by using multiple white light sources with controlled phosphor compositions, enabling the emission of white lights with various color temperatures such as 3000K, 4000K, and 5000K.
Implementation Method 1
A phosphor in the LED functions as a medium that changes energy of an excitation source to energy of a visible light
Data Source
AI summary
A light emitting device is provided. The light emitting device includes a first white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.4822, 0.3980); a second white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.4180, 0.4337); and a third white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.2806, 0.2981).