Laser-Phosphor Lighting CCT Control for High-Brightness Heat Management
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Solution Overview
Problem
Existing high-brightness light emitting devices face challenges in achieving high radiant flux, efficiency, and controllable correlated color temperature (CCT) with effective heat management, particularly in applications like stage lighting.
Innovation Solution
A light generating system comprising a first and second light generating device with distinct peak wavelengths and a luminescent material, controlled by a system to produce light with controllable CCT and high color rendering index (CRI) through a combination of laser light sources and phosphors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power laser-phosphor lighting is used to achieve high brightness, then radiant flux increases, but heat management becomes difficult
Solution Approach 1:
The patent divides the lighting system into multiple independent laser light sources (first and second light generating devices) with different peak wavelengths. This segmentation allows distributed heat generation across multiple sources rather than concentrating heat in a single high-power source, making thermal management more effective while maintaining high overall brightness.
2Adaptability or versatility
If multiple laser light sources with different wavelengths are used, then controllable CCT is achieved, but device complexity increases
Solution Approach 1:
The patent controls the correlated color temperature by adjusting the emission intensity parameters of the first and second laser light sources. By varying the relative intensities of these light sources with fixed peak wavelengths, the system achieves controllable CCT without requiring physical reconfiguration or additional complex components.
3Illumination intensity
If laser light sources are used instead of LED, then brightness increases, but heat generation increases
Solution Approach 1:
The patent introduces phosphor materials as intermediaries that convert laser light at one wavelength to emitted light at different wavelengths. This phosphor conversion mechanism allows the system to achieve high brightness while managing heat more effectively, as the phosphor materials can be thermally managed separately from the laser sources and convert energy in a controlled manner.
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 brightness with controllable CCT and CRI above 70, maintaining a color point close to the black body locus, suitable for applications requiring adjustable color temperature and high intensity lighting.
Implementation Method 1
the first luminescent material may be configured in a light receiving relationship with the first light generating device and may especially be configured to convert at least part of the first device light into first luminescent material light
Implementation Method 2
the first light generating device comprises a first laser light source and is configured to generate first device light having a first device light peak wavelength (λ1)
Data Source
AI summary
The invention provides a light generating system comprising a first light generating device, a second light generating device, a first luminescent material, and a control system, wherein: (A) the first light generating device comprises a first laser light source and is configured to generate first device light (111) having a first device light peak wavelength (λ1) and having a first spectral power distribution; wherein the first device light peak wavelength (λ1) is selected from the wavelength range of 425-465 nm; (B) the second light generating device comprises a second laser light source and is configured to generate second device light (121) having a second device light peak wavelength (λ2) and having a second spectral power distribution, different from the first spectral power distribution; wherein the second device light peak wavelength (λ2) is selected from the range of 470-490 nm; (C) the first luminescent material is configured in a light receiving relationship with the first light generating device and is configured to convert at least part of the first device light into first luminescent material light having a luminescent material emission centroid wavelength (λc,1) within the green-yellow wavelength range; and the first luminescent material is not configured in a light receiving relationship with the second light generating device; (D) the light generating system is configured to generate system light (1001) comprising one or more of the first device light, the second device light, and the first luminescent material light, wherein the system light has a controllable correlated color temperature; and (E) the control system is configured to control the first light generating device and the second light generating device, such that (a) in a first operational mode of the light generating system the system light has a first correlated color temperature CCT1, wherein CCT1≥4000 K, (b) in a second operational mode of the light generating system the system light has a second correlated color temperature (CCT2), wherein CCT2−CCT1≥1000 K, (c) in at least one of the operational modes, the system light has a correlated color temperature selected from the range of at least 7000 K, and (d) the system light in both operational modes has a color rendering index of at least 70.