Semiconductor Light Emitting Device Phosphor Layer Optimization
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Solution Overview
Problem
The degradation of optical characteristics in semiconductor light emitting devices due to the conditions of the phosphor layer and multiple phosphors leads to issues with light emission and color uniformity.
Innovation Solution
A semiconductor light emitting device is designed with a phosphor layer on one side of the semiconductor layer, where the phosphor layer includes multiple phosphors dispersed in a binder, and specific ratios of thickness to width and number of phosphors are optimized to minimize hue shift, ensuring effective light extraction and color conversion, with a support body and interconnect layers on the opposite side for improved light output and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple phosphors are provided in the phosphor layer, then color conversion capability is improved, but hue shift increases and color uniformity deteriorates
Solution Approach 1:
The patent optimizes specific parameters including the thickness-to-width ratio of the phosphor layer (0.01 to 0.05) and the number of phosphors (3 to 7 types) to minimize hue shift while maintaining color conversion capability. These parameter adjustments resolve the contradiction by finding the optimal balance point.
Solution Approach 2:
The patent applies different phosphors with specific characteristics (peak wavelengths, half-value widths, quantum efficiencies) at different locations and combinations within the phosphor layer. This local optimization of phosphor selection and distribution maintains color uniformity while achieving comprehensive color conversion.
2Use of energy by moving object
If phosphor layer thickness is increased, then light absorption and color conversion are improved, but light extraction efficiency decreases
Solution Approach 1:
The patent optimizes the thickness-to-width ratio parameter of the phosphor layer to be between 0.01 and 0.05. This parameter optimization ensures sufficient light absorption for effective color conversion while preventing excessive thickness that would cause total internal reflection and reduce light extraction efficiency.
3Adaptability or versatility
If the number of phosphors is increased, then color rendering is improved, but manufacturing complexity increases
Solution Approach 1:
The patent determines the optimal number of phosphors to be between 3 and 7 types. This parameter setting achieves comprehensive color rendering coverage while avoiding excessive manufacturing complexity that would occur with more phosphor types.
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 optimized phosphor layer configuration enhances light extraction efficiency, reduces hue shift, and improves color uniformity, resulting in better optical characteristics and reliability of the semiconductor light emitting device.
Implementation Method 1
a phosphor layer provided on the semiconductor layer. The phosphor layer includes a plurality of phosphors
Data Source
AI summary
According to one embodiment, a semiconductor light-emitting device includes a semiconductor layer including a light emitting layer; and a phosphor layer provided on the semiconductor layer. The phosphor layer includes a plurality of phosphors, −0.05<A×(AR)+B×(Np)+C<0.05 being satisfied for −0.149055−(3×0.011797)≦constant A≦−0.149055+(3×0.011797), −0.000192−(3×0.00002461)≦constant B≦−0.000192+(3×0.00002461), and 0.0818492−(3×0.005708)≦constant C≦0.0818492+(3×0.005708). AR is a ratio of a thickness of the phosphor layer to a width of the phosphor layer, and Np is a number of the plurality of phosphors.