Sapphire Plate Crystal Orientation for Light Source Thermal Management
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Solution Overview
Problem
In light source devices using wavelength conversion materials, increased light output leads to higher heating values, which can cause material deterioration and damage due to temperature differences between heated regions and outer areas, resulting in performance degradation.
Innovation Solution
A light source device incorporating a sapphire plate with specific crystal orientation and angle settings for the excitation light, utilizing the material's thermal conductivity and birefringent properties to manage heat distribution and reduce thermal expansion differences, thereby minimizing damage to the wavelength conversion material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amount of light is increased, then the lighting output is improved, but the heating value of the wavelength conversion material increases causing deterioration and damage
Solution Approach 1:
The patent changes the optical parameters by controlling the incident angle of excitation light to be 20° or more relative to the c-axis, and setting the angle between sapphire plate surfaces and c-axis to greater than 80°. This parameter change utilizes birefringence to distribute light intensity more evenly, reducing localized heat generation while maintaining high light output.
Solution Approach 2:
The sapphire plate acts as an intermediary between the excitation light source and the wavelength conversion material. By controlling the light path through specific angular relationships with the c-axis, the sapphire plate mediates the energy transfer to reduce harmful thermal effects on the conversion material.
2Illumination intensity
If the amount of light is increased, then the lighting output is improved, but stress caused by temperature difference may damage the wavelength conversion material
Solution Approach 1:
By changing the optical path parameters (incident angle ≥20° relative to c-axis) and crystal orientation parameters (angle between plate surfaces and c-axis >80°), the patent achieves more uniform temperature distribution, reducing thermal stress that could compromise material strength and integrity.
3Temperature
If sapphire plate is used for heat dissipation, then thermal conductivity is improved, but the angle and orientation must be precisely controlled
Solution Approach 1:
The patent specifies precise parameter ranges (angle between plate surfaces and c-axis >80°, incident angle ≥20°) that optimize both heat dissipation performance and manufacturing feasibility. These parameter changes balance the need for thermal management with practical manufacturing constraints.
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 effectively reduces performance degradation and damage from heat, maintaining the integrity of the wavelength conversion material and enhancing the light source device's efficiency and longevity.
Implementation Method 1
Sapphire has high light transmittance and thermal conductivity
Implementation Method 2
utilizing the material's thermal conductivity and birefringent properties to manage heat distribution
Data Source
AI summary
A light source device of the present disclosure includes a sapphire plate having a first surface and a second surface facing each other, a wavelength conversion material located opposite the first surface of the sapphire plate, and a first excitation light source emitting a first excitation light having directivity to the wavelength conversion material through the second surface, in which an angle between the first surface and the second surface, and a c-axis of sapphire is greater than 80°, and an angle between the c-axis and an optical axis of the first excitation light is 20° or more. A lighting device of the present disclosure includes the light source device and a light guide member.