Efficient Wavelength Conversion for High-Quality White Light
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Summary
Problems
Conventional semiconductor light-emitting devices face limitations in achieving efficient and spectrally narrow wavelength conversion, particularly in producing white light with good color rendering and high luminous output, due to the limitations of traditional phosphors in generating red light.
Innovation solutions
A semiconductor light-emitting device is combined with a semiconductor wavelength converting element that is patterned to include regions of wavelength converting material and regions without, allowing for efficient absorption and emission of light, thereby providing spectrally narrow wavelength conversion and enhancing color rendering and luminous output.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If traditional phosphors are used for wavelength conversion, then the device can produce white light, but the spectral narrowness and color rendering quality deteriorate
Why choose this principle:
The patent divides the wavelength converting element into multiple discrete regions, each containing semiconductor wavelength converting material with specific bandgap energies. This segmentation allows different regions to convert light to different wavelengths with narrow spectral widths, overcoming the broad spectral emission of traditional phosphors while maintaining good color rendering through the combination of multiple narrow bands.
Principle concept:
If traditional phosphors are used for wavelength conversion, then the device can produce white light, but the spectral narrowness and color rendering quality deteriorate
Why choose this principle:
The patent implements local quality by assigning different semiconductor materials with specific bandgap energies to different regions of the wavelength converting element. Each region is optimized for converting light to a specific wavelength range, creating locally tailored optical properties that collectively produce high-quality white light with excellent color rendering and spectrally narrow emission.
Application Domain
Data Source
AI summary:
A semiconductor light-emitting device is combined with a semiconductor wavelength converting element that is patterned to include regions of wavelength converting material and regions without, allowing for efficient absorption and emission of light, thereby providing spectrally narrow wavelength conversion and enhancing color rendering and luminous output.
Abstract
Embodiments of the invention include a semiconductor light emitting device ( 10 ) capable of emitting first light having a first peak wavelength and a semiconductor wavelength converting element ( 12 ) capable of absorbing the first light and emitting second light having a second peak wavelength. The semiconductor wavelength converting element ( 12 ) is attached to a support ( 51 ) and disposed in a path of light emitted by the semiconductor light emitting device. The semiconductor wavelength converting element is patterned to include at least two first regions ( 46 ) of semiconductor wavelength converting material and at least one second region ( 48 ) without semiconductor wavelength converting material disposed between the at least two first regions.