Multi-Wavelength Laser Phosphor Light Source for Thermal Quenching
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Solution Overview
Problem
Existing high-power laser light sources face challenges in heat management and thermal quenching of luminescent materials, making it difficult to create compact, high-intensity lighting devices.
Innovation Solution
A light generating system comprising multiple semiconductor-based light sources, including laser diodes, with distinct peak wavelengths and spectral power distributions, combined with a luminescent material that converts light into a desired wavelength range, controlled by a control system to produce high-intensity white light with tunable correlated color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power laser light sources are used to achieve high intensity, then illumination intensity is improved, but heat management becomes difficult and thermal quenching occurs
Solution Approach 1:
The invention divides the single high-power laser source into multiple lower-power laser diodes (first, second, and third light generating devices) with different peak wavelengths. This segmentation allows each diode to operate at lower power levels, generating less heat individually, while their combined output through the luminescent material achieves the desired high intensity without excessive thermal load on any single component.
Solution Approach 2:
The invention changes the operational parameters by using multiple laser diodes with different peak wavelengths (e.g., 450nm, 480nm, 530nm) instead of a single wavelength source. This parameter diversification enables the luminescent material to be excited effectively across multiple wavelengths, achieving high intensity output while distributing the thermal load and avoiding thermal quenching that would occur with a single high-power wavelength source.
2Device complexity
If a single high-power laser source is used, then device complexity is reduced, but thermal quenching of luminescent material occurs
Solution Approach 1:
The invention segments the light generating function across multiple laser diodes with different peak wavelengths. This segmentation prevents thermal quenching by ensuring that no single wavelength delivers excessive power density to the luminescent material, while the combined effect of multiple wavelengths maintains high overall intensity output.
Solution Approach 2:
The invention uses a composite approach by combining multiple laser diodes with different spectral characteristics and a luminescent material that responds to multiple wavelengths. This composite system achieves reliable operation without thermal quenching by distributing the excitation energy across multiple wavelength channels, each operating below the thermal quenching threshold.
3Adaptability or versatility
If multiple light generating devices with different wavelengths are used, then color temperature control is improved, but device complexity increases
Solution Approach 1:
The invention applies multi-functionality by using a single luminescent material that can be excited by multiple laser diode wavelengths (e.g., 450nm, 480nm, 530nm). This universal luminescent material converts all these different wavelength inputs into a unified white light output, enabling color temperature control through wavelength mixing while avoiding the complexity of multiple separate optical paths or conversion stages.
Solution Approach 2:
The invention merges multiple laser diode outputs with different peak wavelengths into a single combined beam that illuminates the luminescent material. This merging approach allows the system to achieve variable color temperature by adjusting the relative intensities of the different wavelength inputs, while the luminescent material unifies these into a single white light output, simplifying the overall optical architecture.
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 controlled color temperature and improved thermal management, overcoming thermal quenching issues and enabling compact, efficient lighting applications.
Implementation Method 1
a luminescent material that converts light into a desired wavelength range
Data Source
AI summary
The invention provides a light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a third light generating device (130), a luminescent material (200), and a control system (300), wherein: (A) the first light generating device (110) comprises a first laser light source and is configured to generate first device light (111) having a first device peak wavelength (λ1) and having a first spectral power distribution; wherein the first device peak wavelength (λ1) is selected from the wavelength range of 445-475 nm; (B) the second light generating device (120) comprises a second laser light source and is configured to generate second device light (121) having a second device peak wavelength (λ2) and having a second spectral power distribution, different from the first spectral power distribution; wherein the second device peak wavelength (λ2) is selected from the range of 420-450 nm or from the range of 470-490 nm; (C) the luminescent material (200) is excitable by the first device light (111) and the second device light (121); wherein the luminescent material (200) is configured to convert at least part of one or more of the first device light (111) and/or the second device light (121) into luminescent material light (201) having a centroid wavelength λc,1 within the green-orange wavelength range; the luminescent material (200) has an absorbance band having a first absorbance E1 at the first device peak wavelength (λ1) and a second absorbance E2 at the second device peak wavelength (λ2), wherein E2/E1<1; (D) the third light generating device (110) comprises a third laser light source and is configured to generate third device light (111) having a third device peak wavelength (23) selected from the wavelength range of 600-650 nm; (E) |λ1−λ2|≥20 nm; λ1 and λ2 are selected from the wavelength range of 420-490 nm; and |λc,1−λ3|≥20 nm; (F) the control system (300) is configured to control at least the first light generating device (110) and the second light generating device (120): (G) the light generating system (1000) is configured to provide in an operational mode white system light (1001).