Reflection-Type Wavelength Conversion Member Heat Dissipation
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Solution Overview
Problem
Wavelength conversion members using inorganic binders face heat storage issues and thermal quenching when exposed to high-energy laser light, leading to reduced luminescent performance and potential breakage due to thermal expansion differences between the phosphor layer and reflector.
Innovation Solution
A reflection-type wavelength conversion member is designed with a transmissive element made of sapphire, a phosphor layer joined by chemical bonding, and a reflector in simple physical contact, where the phosphor layer is bound by translucent ceramic, enhancing heat dissipation and preventing breakage through efficient thermal conduction and external fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an inorganic binder is used in the wavelength conversion member, then heat resistance of the material is enhanced, but heat storage occurs leading to thermal quenching of phosphor particles
Solution Approach 1:
The patent applies different materials with different thermal properties to different regions: the phosphor layer uses inorganic binder for heat resistance, while the reflector uses high-thermal-conductivity material for heat dissipation. This local differentiation resolves the contradiction by ensuring each region has the appropriate thermal characteristics for its function.
Solution Approach 2:
The wavelength conversion member is constructed as a composite structure combining phosphor particles with inorganic binder, attached to a reflector made of high-thermal-conductivity material. This composite approach allows the system to simultaneously achieve heat resistance (from inorganic binder) and heat dissipation (from reflector), resolving the thermal contradiction.
2Power
If a reflection-type wavelength conversion member is used, then luminescent conversion is achieved, but the distance between heat generation region and reflector increases leading to more heat storage
Solution Approach 1:
The patent extracts the heat dissipation function into a separate component (the reflector) that is specifically designed with high thermal conductivity. By separating the luminescent conversion function (phosphor layer) from the heat dissipation function (reflector), the system achieves effective heat removal despite the reflection-type configuration.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the reflector material to be significantly higher than conventional materials. This parameter change enables the reflector to efficiently conduct heat away from the phosphor layer, compensating for the increased distance in reflection-type design.
3Adaptability or versatility
If phosphor layer and reflector are made of different materials, then functional requirements are met, but thermal expansion differences cause breakage
Solution Approach 1:
The patent employs an intermediate layer or specific bonding structure between the phosphor layer and reflector that anticipates and cushions against thermal expansion differences. This preparatory measure prevents breakage by accommodating the differential expansion that occurs during operation.
Solution Approach 2:
The patent introduces an intermediate bonding layer or structure between the phosphor layer and reflector that acts as a mediator. This intermediary component accommodates the thermal expansion difference between the two materials, preventing direct stress transmission that would cause breakage while maintaining functional requirements.
4Use of energy by moving object
If high-energy laser light is used, then energy efficiency is improved, but the irradiated site is burnt
Solution Approach 1:
The patent converts the harmful thermal energy that would cause burning into beneficial heat dissipation through the high-thermal-conductivity reflector. The heat generated by high-energy laser excitation is rapidly conducted away from the phosphor layer, preventing burning while maintaining the energy efficiency benefits of laser excitation.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the materials involved, particularly the reflector, to enable rapid heat removal. This parameter change allows the system to withstand high-energy laser irradiation without burning, while preserving the energy efficiency advantages of laser excitation.
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 dissipates heat from high-energy light exposure, maintains fluorescent performance, and prevents breakage by ensuring high thermal conductivity and uniform heat distribution, allowing the wavelength conversion member to operate efficiently even at high output.
Implementation Method 1
a phosphor layer joined to the transmissive element and including phosphor particles that absorb light and emit converted light
Implementation Method 2
the phosphor layer joined to the transmissive element by chemical bonding
Implementation Method 3
configured to reflect the light on a reflection surface, thereby emitting the light as illumination light
Implementation Method 4
the thermal conduction from the phosphor layer to the transmissive element is increased
Data Source
AI summary
The invention provides a wavelength conversion member which can draw heat efficiently away from a region that is prone to generating heat under irradiation of light with a high energy density and which can suppress the thermal quenching of phosphor, and provides a method for manufacturing such wavelength conversion members, and a light-emitting device having such a wavelength conversion member.A wavelength conversion member 100 of reflection type is configured to convert light with a specific wavelength to light with other wavelength and also configured to reflect the light on a reflection surface, thereby emitting the light as illumination light, wherein the wavelength conversion member 100 includes a transmissive element 110 including an inorganic material and being optically transmissive, a phosphor layer 120 joined to the transmissive element 110 and including phosphor particles that absorb light and emit converted light and a translucent ceramic that binds the phosphor particles to one another, and a reflector 130 disposed in contact with a side of the phosphor layer 120 opposite to the transmissive element 110 and defining the reflection surface on which the converted light is reflected. With this configuration, heat can be dissipated efficiently from a region that is prone to generating heat under irradiation of light with a high energy density, and the thermal quenching of phosphor can be suppressed.