Spatially Segmented Wavelength Conversion for LED Efficiency
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Solution Overview
Problem
Conventional light emitting devices with color conversion materials suffer from reduced conversion efficiency due to absorption of short-wavelength light by other color conversion materials, leading to increased conversion processes and decreased light emission efficiency.
Innovation Solution
A light emitting device design with a light emitting element and a light emitting conversion unit, where the proportion of short wavelength conversion material is higher in a region further from the element, reducing absorption by long wavelength conversion materials, and optionally using a wavelength selecting material to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color conversion materials are dispersed in transparent resin, then white light with high color rendering properties is created, but light emitted by color conversion materials is absorbed again by other color conversion materials, reducing conversion efficiency
Solution Approach 1:
The patent divides the light emitting device into distinct regions: a first region containing long wavelength conversion materials (red and green) and a second region containing short wavelength conversion materials (blue). This spatial segmentation prevents blue light emitted in the second region from being re-absorbed by color conversion materials in the first region, thereby reducing energy loss while maintaining high color rendering properties.
Solution Approach 2:
The patent applies different color conversion material compositions to different regions of the device. The first region near the ultraviolet LED contains long wavelength conversion materials optimized for that location, while the second region farther away contains short wavelength conversion materials. This local optimization ensures that blue light emitted in the second region does not encounter absorbing materials, improving conversion efficiency while maintaining overall color quality.
2Productivity
If short wavelength conversion materials are placed near the light emitting element, then conversion process is reduced, but blue light with large energy is easily absorbed again by other color conversion materials
Solution Approach 1:
The patent segments the device into two functional regions: the first region near the ultraviolet LED contains long wavelength conversion materials, while the second region contains short wavelength conversion materials. This segmentation allows blue light to be generated in the second region where it will not be re-absorbed, maintaining high conversion efficiency and light emission efficiency simultaneously.
Solution Approach 2:
The patent transitions from a single mixed region to a multi-region spatial arrangement. By organizing color conversion materials into distinct spatial zones (first region with long wavelength materials, second region with short wavelength materials), the patent creates a dimensional structure that prevents harmful interactions while maintaining efficient conversion.
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 design enhances light emission efficiency by minimizing re-absorption of short-wavelength light, allowing more light to be emitted externally and improving overall conversion efficiency.
Implementation Method 1
a short wavelength conversion material which emits light with a second wavelength by absorbing light with a first wavelength
Implementation Method 2
a long wavelength conversion material which emits light with a wavelength longer than the second wavelength by absorbing light with a first wavelength
Data Source
AI summary
A light emitting device includes a light emitting element which emits light with a first wavelength; and a light emitting conversion unit for converting the light with the first wavelength by using wavelength conversion materials including a short wavelength conversion material and a long wavelength conversion material, the short wavelength conversion material being that which emits light with a second wavelength longer in wavelength than the light with the first wavelength, by absorbing the light with the first wavelength, and the long wavelength conversion material being that which emits light with a wavelength longer than the second wavelength by absorbing the light with the first wavelength. A proportion of the short wavelength conversion material of the wavelength conversion materials included in a first region is smaller than that of the short wavelength conversion material of the wavelength conversion materials included in the entire light emitting conversion unit, and a proportion of the short wavelength conversion material of the wavelength conversion materials included in a second region is larger than that of the short wavelength conversion material of the wavelength conversion materials included in the entire light emitting conversion unit.