Reflective Semiconductor Light Source Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor light source apparatuses experience degradation of optical characteristics due to heat generated from the phosphor plate and reflector layers, leading to reduced light intensity and reflectivity, especially when high power semiconductor light sources are used under large currents.
Innovation Solution
The design incorporates a phosphor plate with a first reflector layer and a contact layer, where the heat is efficiently radiated through a second reflector layer, which is constructed as a radiating layer, improving thermal conductivity and preventing optical characteristic degradation. This configuration includes a semiconductor light source emitting excited light that intersects with the phosphor plate at an angle, allowing efficient wavelength conversion and heat dissipation without resin components, enhancing the reliability of the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective type semiconductor light source apparatus uses a phosphor plate with a reflector layer to emit high intensity mixture light, then the light intensity is improved, but heat generated from the phosphor plate and reflector layer degrades optical characteristics over time
Solution Approach 1:
The reflector function is divided into two separate layers: a first reflector layer in contact with the phosphor plate for reflecting light, and a second reflector layer positioned away from the phosphor plate for radiating heat. This segmentation allows each layer to specialize in its function, preventing heat from degrading the optical characteristics while maintaining high light intensity.
Solution Approach 2:
A transparent adhesive material is introduced as an intermediary between the phosphor plate and the first reflector layer. This intermediary material serves dual purposes: it maintains the structural assembly while providing thermal isolation to prevent heat from directly degrading the optical characteristics of the phosphor plate and reflector layer.
2Illumination intensity
If a metallic reflector is used to reflect mixture light, then the reflectivity is improved, but heat from the phosphor plate degrades the adhesive material and reflector over time
Solution Approach 1:
The heat radiation function is extracted from the first reflector layer and assigned to a separate second reflector layer. This allows the first reflector layer to focus solely on reflecting light with high reflectivity, while the second layer handles thermal management by radiating heat away from the phosphor plate, preventing degradation of the adhesive material and reflector.
Solution Approach 2:
The heat radiation function is positioned in a different spatial dimension (away from the phosphor plate) compared to the light reflection function (in contact with the phosphor plate). This spatial separation allows both functions to operate simultaneously without interfering with each other, maintaining both high reflectivity and thermal management.
3Illumination intensity
If high power semiconductor light sources are used under large currents to increase brightness, then the illumination intensity is improved, but heat generation increases and degrades optical characteristics
Solution Approach 1:
The heat generated from the phosphor plate, which was previously a harmful factor degrading optical characteristics, is converted into a beneficial effect by using it to drive the second reflector layer's heat radiation function. The heat is systematically radiated away from the optical components through the second reflector layer, transforming a destructive thermal field into a controlled thermal management mechanism that protects the optical characteristics while enabling high power operation.
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 prevents optical characteristic degradation and maintains high brightness and reliability, enabling the emission of various color lights, including white tones, suitable for applications like general lighting, stage lights, and projectors, even under high power and large current conditions.
Implementation Method 1
a phosphor plate (10) formed in a substantially planar shape... by entering an exciting light emitted from the semiconductor light source (5) into the phosphor plate (10) and by wavelength-converting the exciting light
Implementation Method 2
a first reflector layer (41) disposed underneath a part of a phosphor bottom surface (10a) of the phosphor plate (10)... by reflecting the mixture light with the reflector surface
Implementation Method 3
a second reflector layer (42) formed on the base board (20), and contacting with the contact layer (30) in an opposite direction of the first reflector layer (41)... which can efficiently radiate the heats using a second reflector layer
Implementation Method 4
a contact layer (30) including an adhesive material, contacting with the first reflector layer (41), and contacting with the other part of the phosphor bottom surface (10a)... which can efficiently radiate the heats using a second reflector layer
Data Source
AI summary
A reliable reflective typed semiconductor light source apparatus can emit various color lights having high brightness. The apparatus can include a first and second reflector layer, a phosphor plate disposed on the first reflector layer and a semiconductor light source. The phosphor plate can include at least one of at least one of a red phosphor, a green phosphor, a blue phosphor and a yellow phosphor. The light source can be located adjacent the phosphor plate so that an excited light emitted from the light source can be efficiently reflected on the first reflector layer via the phosphor plate and so that heats generated from the first reflector layer and the like can efficiently transmit toward the second reflector layer. Thus, the disclosed subject matter can provide a semiconductor light source apparatus that can emit various color lights having high brightness, and which can be used for general lighting, etc.