White Light Source Device With Segmented Wavelength Conversion Units
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Solution Overview
Problem
Conventional white LED lighting devices struggle to achieve high Color Rendering Index (CRI) performance while maintaining sufficient luminance, often resulting in insufficient red light emission and increased power consumption when attempting to mimic natural light spectra.
Innovation Solution
The white light source device employs multiple light-emitting elements with distinct wavelength conversion units, including blue-green and red phosphors, to create a white light beam with improved CRI by separating the emission spectra and avoiding phosphor absorption, thereby enhancing luminous efficiency and meeting high-quality lighting requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional white LED uses single wavelength conversion unit with phosphors, then device complexity is low, but Color Rendering Index (CRI) is insufficient and red light emission is inadequate
Solution Approach 1:
The patent divides the wavelength conversion system into multiple independent conversion units, each containing specific phosphors (e.g., first conversion unit with blue-green phosphors, second conversion unit with red phosphors). This segmentation allows each unit to target specific wavelength ranges, improving overall CRI performance while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The patent employs composite phosphor materials with different emission characteristics combined in separate conversion units. By using composite materials with tailored photoluminescent properties, the system achieves high CRI performance through synergistic combination of different phosphor types (yellow, red, green phosphors) that collectively cover the visible spectrum.
2Manufacturing precision
If conventional white LED attempts to mimic natural light spectra by adjusting phosphor composition, then CRI improves, but luminance decreases and power consumption increases
Solution Approach 1:
By segmenting the light emission into multiple dedicated units with specific wavelength conversion functions, the patent avoids the need for excessive phosphor materials in a single unit. Each unit operates efficiently in its optimized wavelength range, reducing overall power consumption while achieving high color fidelity through the combined output of all units.
Solution Approach 2:
The patent optimizes the emission spectrum parameters by controlling the peak wavelengths and intensity distributions of individual light-emitting units. By adjusting parameters such as the first peak wavelength (450-462.5 nm) and second peak wavelength (462.5-500 nm), the system achieves natural light-like color fidelity without requiring increased power input.
3Manufacturing precision
If conventional white LED uses multiple phosphor types in single conversion unit, then CRI improves, but phosphor absorption occurs reducing luminous efficiency
Solution Approach 1:
The patent physically separates different phosphor types into distinct wavelength conversion units, preventing phosphor-phosphor absorption interactions that occur when multiple phosphors are mixed in a single unit. Each conversion unit contains specific phosphors (e.g., yellow phosphors in first unit, red phosphors in second unit) that convert pump light independently, eliminating energy loss from mutual absorption while maintaining high CRI performance through combined output.
4Manufacturing precision
If conventional white LED increases red light emission to improve CRI, then Color Rendering Index improves, but luminance decreases
Solution Approach 1:
By dedicating specific conversion units to red light emission while other units handle blue-green wavelengths, the patent maintains high luminance from the efficient blue LED pumps while ensuring adequate red light content for superior color rendering. The segmented architecture allows red phosphors to be excited by optimized pump wavelengths, preventing the luminance penalty associated with trying to boost red emission in conventional single-unit designs.
Solution Approach 2:
The patent controls the intensity and wavelength parameters of individual light-emitting units to achieve a balanced spectral distribution. By adjusting the relative intensities of units with different peak wavelengths and optimizing the photoluminescent conversion efficiency, the system maintains high overall luminance while ensuring sufficient red light content for CRI greater than 90.
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 configuration achieves a CRI greater than 90 for various color indices, promoting luminous efficiency and maintaining high luminance, effectively addressing the limitations of traditional white LED lighting in replicating natural light spectra.
Implementation Method 1
The first light-emitting element includes a first light-emitting unit and a first wavelength conversion unit
Implementation Method 2
Each of the second light-emitting elements includes a second light-emitting unit and at least a second wavelength conversion unit
Implementation Method 3
The first light beam and the second light beam are mixed into a white light beam
Data Source
AI summary
A white light source device includes a first light-emitting element, and at least one second light-emitting element. The first light-emitting element includes a first light-emitting unit and a first wavelength conversion unit, and emits a first light beam. Each of the second light-emitting elements includes a second light-emitting unit and a second wavelength conversion unit, and emits a second light beam. An emission spectrum of the second light beam is different from an emission spectrum of the first light beam. The first light beam and the second light beam are mixed into a white light beam, and a color fidelity index of the white light beam is greater than 90.