Semiconductor Light-Emitting Device Seal Layer Pigment Gradient
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Solution Overview
Problem
Existing semiconductor light-emitting devices face challenges in easily adjusting light intensity due to large changes in luminance resulting from variations in the mix rate of black pigment, making it difficult to achieve precise control over light output.
Innovation Solution
A semiconductor light-emitting device is developed with a seal layer containing inorganic pigment particles dispersed in a resin layer, where the particles are concentrated towards the substrate, allowing for controlled light intensity adjustment by varying the concentration of inorganic pigment particles, which are sized between 1 μm to 50 μm to prevent excessive light passage and facilitate settling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the mix rate of black pigment is adjusted to control light intensity, then light intensity can be changed, but the control becomes difficult because a small change in mix rate leads to a large change in light intensity
Solution Approach 1:
The patent changes the particle size parameter of the black pigment from conventional fine particles to coarse particles (1-50 μm). This parameter change causes the pigment to settle at the bottom of the seal layer rather than being uniformly distributed, creating a concentration gradient that provides gradual light intensity control and reduces the sensitivity of light output to mixing rate variations.
2Illumination intensity
If black pigment is mixed uniformly into the seal layer to attenuate light, then light intensity can be reduced, but the half-value angle becomes difficult to control
Solution Approach 1:
The patent creates a non-uniform distribution of black pigment within the seal layer, with higher concentration at the bottom and lower concentration toward the top. This local quality variation allows the seal layer to simultaneously achieve light attenuation while maintaining a controlled half-value angle, as the settled pigment particles primarily affect light intensity without excessively broadening the emission angle.
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 approach enables easy adjustment of light intensity with reduced influence on the half-value angle, maintaining stable light output over a wide angle and ensuring consistent quality, while allowing for precise control of light attenuation through the concentration of inorganic pigment particles.
Implementation Method 1
settling out the inorganic pigment particles toward the substrate
Data Source
AI summary
Provided are a semiconductor light-emitting device capable of easily adjusting the light intensity of output light and a method for producing such a semiconductor light-emitting device. The semiconductor light-emitting device includes: a substrate; a light-emitting element mounted on the substrate; and a seal layer provided on the substrate so as to cover the light-emitting element. The seal layer contains resin and inorganic pigment particles. The inorganic particles have an average particle size of 1 □m or larger and 50 □m or smaller in a volumetric basis particle size distribution by a laser diffraction scattering particle size distribution measurement method. The inorganic particles distributed at a concentration becoming thicker in a direction toward said substrate.