Efficient LED White Light with Wavelength Conversion Tube
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Summary
Problems
Conventional semiconductor light emitting devices, such as LEDs, face challenges in achieving high efficiency and color rendering index for white light production, particularly in wavelength ranges like 550 nm, and existing wavelength conversion methods often result in inefficient light conversion and backscattering.
Innovation solutions
The use of an elongated hollow wavelength conversion tube with wavelength conversion material dispersed within its wall, where the semiconductor light emitting device is oriented to emit light at an oblique angle, providing a longer path length for unconverted light without increasing the path length of converted light, thereby reducing backscattering and enhancing efficiency.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional wavelength conversion methods are used with LEDs, then white light can be produced, but light conversion efficiency is reduced and backscattering occurs
Why choose this principle:
The wavelength conversion function is segmented into discrete phosphor particles dispersed within a transparent matrix material, rather than using a continuous phosphor layer. This segmentation allows light to interact with individual phosphor particles, reducing backscattering and improving conversion efficiency while maintaining ease of manufacture through conventional mixing and encapsulation processes
Principle concept:
If conventional wavelength conversion methods are used with LEDs, then white light can be produced, but light conversion efficiency is reduced and backscattering occurs
Why choose this principle:
A transparent matrix material serves as an intermediary between the LED light source and the phosphor particles, providing a medium that allows optimal light-phosphor interaction while minimizing backscattering. The matrix material mediates the optical path to enhance conversion efficiency without complicating the manufacturing process
Application Domain
Data Source
AI summary:
The use of an elongated hollow wavelength conversion tube with wavelength conversion material dispersed within its wall, where the semiconductor light emitting device is oriented to emit light at an oblique angle, providing a longer path length for unconverted light without increasing the path length of converted light, thereby reducing backscattering and enhancing efficiency.
Abstract
A semiconductor light emitting apparatus includes an elongated hollow wavelength conversion tube that includes an elongated wavelength conversion tube wall having wavelength conversion material, such as phosphor, dispersed therein. A semiconductor light emitting device is oriented to emit light inside the elongated hollow wavelength conversion tube to impinge upon the elongated wavelength conversion tube wall and the wavelength conversion material dispersed therein. The elongated hollow wavelength conversion tube may have an open end, a crimped end, a reflective end, and/or other configurations. Multiples tubes and/or multiple semiconductor light emitting devices may also be used in various configurations. Related assembling methods are also described.