Broadband LED Light Source With Phosphor Mixing for Biochemical Analysis
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Solution Overview
Problem
Existing biochemical analyzing devices face challenges in achieving a broadband light source capable of emitting light in the wavelength range of 340 to 800 nm using LED light sources, due to limited excitation bands of near-infrared fluorescent substances in the near-ultraviolet region.
Innovation Solution
A broadband light source device is developed, comprising a first LED chip generating a light beam with a first wavelength band, a fluorescent substance including alumina and at least one of Fe, Cr, Bi, Tl, Ce, Tb, Eu, and Mn, and a second LED chip generating a light beam with a second wavelength band. The fluorescent substance is produced by calcining a raw material with sodium content between 6.1 to 15.9 wt.%, and the light beams from the fluorescent substance and the second LED chip are color-mixed to achieve a broadband light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If near-infrared fluorescent substances are used with near-ultraviolet LEDs, then the device achieves LED-based light source functionality, but the light emission intensity in the near-infrared region becomes low due to limited excitation bands
Solution Approach 1:
The patent combines multiple fluorescent substances (first fluorescent substance for near-infrared emission and second fluorescent substance for visible light emission) with multiple LED chips (near-ultraviolet LED and blue LED) into a single light source device. This merging allows the device to achieve both long service life through LED technology and sufficient light emission intensity across a broad wavelength range (380-800 nm) by utilizing the complementary excitation and emission characteristics of different fluorescent materials.
Solution Approach 2:
The patent uses composite fluorescent materials including alumina doped with multiple elements (Fe, Cr, Bi, Tl, Ce, Tb, Eu, Mn) to create a fluorescent substance with enhanced and broadened emission characteristics. This composite approach allows the material to be excited by near-ultraviolet light while emitting across both near-infrared and visible regions, thereby improving overall light emission intensity while maintaining LED-based longevity.
2Adaptability or versatility
If a broadband light source covering 340 to 800 nm is achieved using multiple LED chips and fluorescent substances, then the wavelength range is expanded, but the device complexity increases
Solution Approach 1:
The patent integrates multiple LED chips (near-ultraviolet LED and blue LED) and multiple fluorescent substances into a single unified light source device. By merging these components into one device rather than using separate light sources, the patent achieves broadband emission (380-800 nm) while managing device complexity through integration. The multiple LEDs and fluorescent materials work together synergistically to produce the desired spectral output.
Solution Approach 2:
The light source device is designed to perform multiple functions simultaneously: it emits near-infrared light, visible light, and ultraviolet light across a broad spectrum (380-800 nm and beyond). This multi-functionality is achieved through the combination of different LED types and fluorescent substances, allowing a single device to replace what would traditionally require multiple separate light sources for different wavelength ranges.
3Illumination intensity
If fluorescent substances with specific sodium content (6.1 to 15.9 wt.%) are used, then the light emission intensity is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a precise sodium content range (6.1 to 15.9 wt.%) in the alumina-based fluorescent substance to optimize light emission intensity. This parameter control is applied to the raw material composition during manufacturing. By defining this specific parameter range, the patent achieves enhanced emission characteristics while providing clear manufacturing guidelines that balance precision requirements with practical production capabilities.
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 solution improves the service life and performance of the biochemical analyzing device, facilitates maintenance, and enhances the light emission intensity in the near-infrared region, thereby overcoming the limitations of existing technologies.
Implementation Method 1
a first LED chip that generates a light beam having a first wavelength band; a fluorescent substance that is provided in the light beam of the first LED chip
Implementation Method 2
the fluorescent substance includes at least alumina and at least one of Fe, Cr, Bi, Tl, Ce, Tb, Eu, and Mn and is produced by calcining a raw material that contains sodium
Data Source
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AI summary
An object of the present invention is to improve service life and performance of a broadband light source device in a biochemical analyzing device, and facilitates maintenance thereof. A broadband light source device is provided which includes an LED substrate 12 that is provided with an LED chip 14 generating a light beam having a first wavelength band and including a fluorescent substance in the light beam having a first wavelength band and that is provided with an LED chip 13 generating a light beam having a second wavelength band, in which the fluorescent substance includes at least alumina and at least one of Fe, Cr, Bi, Tl, Ce, Tb, Eu, and Mn and is produced by calcining a raw material that contains sodium at 6.1 to 15.9 wt.% in the whole raw material. The broadband light source device is further provided with an optical system including a light pipe 15 that color-mixes the light beam passing through the fluorescent substance of the LED chip 14 and the light beam emitted from the LED chip 13, and a flat dichroic prism 70.