Phosphor Ceramic Light Source for Thermal Quenching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor light source apparatuses with phosphor layers face challenges in maintaining brightness due to thermal quenching and light absorption, especially when high currents are used, leading to reduced light intensity and inefficient heat radiation.
Innovation Solution
A semiconductor light source apparatus with a phosphor layer located on a radiating substrate without a resin component, allowing for efficient wavelength conversion and heat radiation, and a rotating phosphor wheel design to improve radiating efficiency and adjust color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large current is flowed in the semiconductor light-emitting device to enhance excitation intensity, then the brightness is improved, but heat occurs in the phosphor layer causing tarnish of the transparent resin and reduction of fluorescent intensity
Solution Approach 1:
The patent removes the transparent resin component from the phosphor layer, extracting the harmful element that causes tarnish and light absorption. The phosphor layer is formed without resin binding agents, eliminating the source of thermal degradation and light loss while maintaining phosphor particle functionality.
Solution Approach 2:
The patent uses a composite phosphor layer structure combining phosphor particles with inorganic materials such as glass ceramics or transparent ceramics. This composite approach replaces organic resin with inorganic materials that have superior thermal stability and optical properties, preventing tarnish and maintaining high light transmission.
2Reliability
If a phosphor ceramic layer without transparent resin is used to prevent tarnish, then thermal stability is improved, but light reflected on the phosphor ceramic layer returns to the semiconductor light-emitting device causing reduction of light use efficiency
Solution Approach 1:
The patent changes the optical dimension by controlling the refractive index matching between the phosphor particles and the surrounding inorganic matrix. By optimizing this refractive index relationship, light reflection is minimized and light transmission is maximized, allowing efficient light extraction without the harmful effects of resin materials.
3Power
If high power semiconductor light-emitting device is used to emit various color lights, then light intensity is increased, but heat generated reduces radiating efficiency
Solution Approach 1:
The patent employs inorganic composite materials (glass ceramics or transparent ceramics) with high thermal conductivity in the phosphor layer. These materials efficiently conduct heat away from the semiconductor light-emitting device, improving radiating efficiency while maintaining high power operation and various color light emission.
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-brightness emission of various color lights with improved light use efficiency and heat radiation, suitable for general lighting, stage lighting, and projectors, while maintaining light intensity and adjusting color tone effectively.
Implementation Method 1
at least one phosphor layer 2 disposed on the mounting surface 6a of the radiating substrate 6 via an adhesive material 7, and the at least one phosphor layer 2 composed of at least one of a glass phosphor and a phosphor ceramic which do not include a substantially resin component... the phosphor layer 2 to wavelength-convert light emitted from the semiconductor light source 5
Implementation Method 2
a radiating substrate 6 having a mounting surface 6a... allowing for efficient wavelength conversion and heat radiation
Data Source
AI summary
A semiconductor light source apparatus can emit various color lights having high brightness. The semiconductor light source apparatus can include a radiating substrate, at least one phosphor layer disposed on the radiating substrate and a semiconductor light source. The at least one phosphor layer can be composed of at least one of a glass phosphor and a phosphor ceramic and can include at least one of a red phosphor, a green phosphor and a blue phosphor. The light source can be located adjacent the phosphor layer so that light having high brightness emitted from the light source can be efficiently reflected on the radiating substrate via the at least one phosphor layer. Thus, the disclosed subject matter can provide a semiconductor light source apparatus that can emit various color lights having high brightness and a lighting unit using the light source apparatus, which can be used for general lighting, etc.