Semiconductor Light Emitting Device Chromaticity Control
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Solution Overview
Problem
Semiconductor light emitting devices that combine a semiconductor light emitting element with a fluorescent material often experience variations in chromaticity, leading to color breakup when viewed from different angles, which affects the consistency and quality of the emitted light.
Innovation Solution
The device incorporates a scattering layer with scattering materials integrated by a second bonding material on the fluorescent material layer, which scatters the excitation light to match the luminance distribution of the fluorescent materials, and a reflection film with higher reflectance for the light emitting layer than for the fluorescent materials, optimizing light output and chromaticity consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a semiconductor light emitting element is combined with a fluorescent material to emit visible light, then the device becomes a compact light source, but chromaticity variation occurs causing color breakup
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of fluorescent materials within the resin layer. Specifically, the fluorescent material concentration varies across different regions of the layer, with higher concentration in certain areas and lower concentration in others. This spatial variation in material composition allows different regions to emit light with appropriate chromaticity, thereby preventing color breakup while maintaining the compact device structure.
2Illumination intensity
If fluorescent materials are used to convert light wavelength, then visible light emission is achieved, but light loss occurs reducing luminous efficiency
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration distribution of fluorescent materials and the thickness of the resin layer. By optimizing these parameters, the light conversion efficiency is improved while minimizing energy loss. The specific parameter settings ensure that the fluorescent materials effectively convert pump light to visible light without excessive absorption losses, thereby achieving high luminous efficiency.
3Manufacturing precision
If multiple fluorescent materials are integrated to achieve desired color output, then chromaticity control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by integrating multiple fluorescent materials with different emission characteristics into a single resin layer. Instead of using separate layers or components for each fluorescent material, they are combined within one layer with spatially varying concentrations. This approach achieves precise chromaticity control through the composite material distribution while avoiding the manufacturing complexity of multiple separate structural layers.
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
This configuration minimizes color breakup and enhances the luminous efficiency by ensuring consistent chromaticity across different viewing angles and reduces light loss, resulting in a more stable and efficient light emission.
Implementation Method 1
a light emitting layer (13)
Implementation Method 2
The fluorescent material layer (30) includes a plurality of fluorescent materials (31) and a bonding material (33). The fluorescent materials (31) are integrated by the bonding material (33) and configured to be excited by radiated light of the light emitting layer (13) and emit light of a different wavelength from the radiated light of the light emitting layer (13)
Implementation Method 3
The scattering layer (60) includes a plurality of scattering materials (61) and a bonding material (62). The scattering materials (61) are integrated by the bonding material (62) and configured to scatter the radiated light of the light emitting layer (13)
Implementation Method 4
The reflection film is partially provided on the fluorescent material layer (30) and has a higher reflectance to the radiated light of the light emitting layer (13) than to the radiated light of the fluorescent materials (31)
Data Source
AI summary
According to one embodiment, a semiconductor light emitting device includes a semiconductor layer, a p-side electrode, an n-side electrode, a fluorescent material layer and a reflection film. The semiconductor layer has a first surface and a second surface on an opposite side to the first surface and includes a light emitting layer. The p-side electrode and the n-side electrode are provided on the semiconductor layer on a side of the second surface. The fluorescent material layer is provided on a side of the first surface and includes a plurality of fluorescent materials and a bonding material. The bonding material integrates the fluorescent materials. The reflection film is partially provided on the fluorescent material layer and has a higher reflectance to the radiated light of the light emitting layer than to the radiated light of the fluorescent materials.