Laser Lighting Device Phosphor Thickness Optimization
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Solution Overview
Problem
Current lighting devices using laser light sources and phosphor regions struggle to achieve high efficiency in wavelength conversion and homogenous light distribution, leading to incomplete color mixing and light loss.
Innovation Solution
A lighting device comprising a reflector, a phosphor region capable of wavelength conversion using phosphors, and a laser light source, where the phosphor region is adjustable in thickness and phosphor concentration to achieve up to 99% wavelength conversion, and is designed to emit mixed light by combining wavelength-converted and non-converted light, with optional features like a rotating phosphor carrier and color-selective reflectors for improved light homogeneity and color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the phosphor region thickness and phosphor concentration are increased to improve wavelength conversion efficiency, then the wavelength conversion efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the thickness of the phosphor region and the concentration of phosphor particles to optimize wavelength conversion efficiency. The phosphor region thickness is set between 0.1mm to 5mm and phosphor concentration between 1% to 50% by weight, allowing precise control of conversion efficiency while managing device complexity through defined parameter ranges.
2Stability of the object's composition
If a rotating phosphor carrier is used to improve light homogeneity, then the light distribution homogeneity is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamics by implementing a rotating phosphor carrier that rotates at speeds between 100 to 5000 rpm. This rotational motion dynamically distributes phosphor particles uniformly across the illumination area, achieving homogeneous light distribution while the rotation speed can be controlled to balance performance and mechanical complexity.
3Stability of the object's composition
If the laser beam is expanded to improve phosphor illumination homogeneity, then the illumination homogeneity is improved, but the optical system complexity increases
Solution Approach 1:
The patent uses an intermediary optical system comprising a beam expanding lens or mirror positioned between the laser source and phosphor region. This intermediary component expands the narrow laser beam to cover the phosphor region more uniformly, improving illumination homogeneity while isolating the complexity of beam shaping from the core phosphor conversion mechanism.
4Measurement precision
If color-selective reflectors are used to improve color separation, then the color accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by implementing color-selective reflectors with specific spectral reflectance characteristics positioned at particular locations within the optical path. These reflectors are designed to reflect specific wavelength ranges (e.g., red, green, blue) while absorbing or transmitting other wavelengths, enabling precise color separation and accuracy through localized functional specialization rather than uniform treatment across the entire system.
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 enables high-intensity, homogenous light emission with up to 99% wavelength conversion, reducing light loss and improving color accuracy, making it suitable for various applications including automotive lighting and projection systems.
Implementation Method 1
The wavelength conversion can be carried out for example on the basis of luminescence, in particular photoluminescence or radio luminescence, in particular phosphorescence and/or fluorescence.
Implementation Method 2
at least one reflector, wherein the at least one luminous region can be excited to emit light by means of at least one laser and at least part of the light emitted by the at least one luminous region is incident on the at least one reflector.
Data Source
AI summary
A lighting device, comprising at least one reflector, at least one luminous region containing phosphor, and at least one laser, wherein the at least one luminous region is adapted to be excited to emit light by at least one laser and at least part of the light emitted by the at least one luminous region is incident on the at least one reflector.