Blue Laser and Superluminescent Diode Light Source for High Brightness
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Solution Overview
Problem
Existing light generating systems face challenges in achieving high intensity, controllable spectral power distribution, and reduced heat generation, particularly in applications like projection, stage-lighting, and automotive lighting.
Innovation Solution
A light generating system comprising a plurality of light sources, a first luminescent material, and a second luminescent material, where a blue laser light source pumps the first luminescent material to convert light into the green and yellow spectrum, and a superluminescent diode in the yellow and orange spectrum pumps the second luminescent material to convert light into the orange and red spectrum, thereby generating white light with improved intensity and spectral control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single blue laser pumps a phosphor to generate white light, then high intensity can be achieved, but the spectral power distribution becomes difficult to control and heat generation increases
Solution Approach 1:
The invention segments the white light generation process into multiple independent light sources (blue laser, yellow laser, red laser) that can be individually controlled. Each laser pumps a separate phosphor material, allowing independent adjustment of each color component's intensity and spectral characteristics, thereby achieving precise control over the overall spectral power distribution while maintaining high intensity output.
2Illumination intensity
If a single blue laser pumps a phosphor to generate white light, then high intensity can be achieved, but heat management becomes problematic
Solution Approach 1:
The invention distributes the pumping power across multiple laser-phosphor pairs operating at different wavelengths. This segmentation allows heat generation to be spread across multiple independent thermal management zones, preventing concentration of heat in a single location and enabling more effective thermal dissipation through multiple heat sinks or cooling paths.
Solution Approach 2:
The invention applies different phosphor materials optimized for specific wavelength ranges, where each phosphor has tailored thermal and optical properties. This local optimization allows selection of phosphors with superior thermal conductivity or heat capacity in specific regions of the spectrum, improving overall heat management while maintaining high intensity output.
3Use of energy by moving object
If luminescent materials with large Stokes-shift are used, then wavelength conversion can be achieved, but heat generation increases
Solution Approach 1:
The invention selects and optimizes the Stokes-shift parameter for each laser-phosphor pair based on the specific application requirements. By carefully choosing phosphors with appropriate Stokes-shift values for each wavelength region, the system achieves effective wavelength conversion while minimizing energy loss to heat, as the Stokes-shift is optimized rather than maximized uniformly across all conversions.
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 system achieves high intensity white light with a controllable color point, correlated color temperature, and color rendering index, while also enhancing heat management, allowing for a compact and efficient light generating device.
Implementation Method 1
a blue laser light source pumps the first luminescent material to convert light into the green and yellow spectrum
Implementation Method 2
a superluminescent diode in the yellow and orange spectrum pumps the second luminescent material to convert light into the orange and red spectrum
Data Source
AI summary
The invention provides a light generating system (1000) comprising (i) a plurality of light sources (110, 120, . . . ), (ii) a first luminescent material (210), and (iii) a second luminescent material (220), wherein: (a) a first light source (110) is configured to generate first light source light (111) having one or more wavelengths in the blue wavelength range and having a first centroid wavelength (λC1), wherein the first light source (110) is a laser; (b) the first luminescent material (210) is configured to convert at least part of the first light source light (111) into first luminescent material light (211) having one or more wavelengths in the green and/or yellow wavelength range; (c) a second light source (120) is configured to generate second light source light (121) having one or more wavelengths in the yellow and/or orange wavelength range and having a second centroid wavelength (λC2), wherein λC2>λC1; wherein the second light source (120) is a superluminescent diode; (d) the second luminescent material (220) is configured to convert at least part of the second light source light (121) into second luminescent material light (221) having one or more wavelengths in the orange and/or red wavelength range; and (e) in an operational mode the light generating system (1000) is configured to generate system light (1001) comprising the first luminescent material light (211) and the second luminescent material light (221).