Semiconductor Light Emitting Device Red Island Structure
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Solution Overview
Problem
Conventional white light emitting diodes have poor color rendering properties due to a lack of red emission light, which is essential for improving the appearance of colors in illumination applications.
Innovation Solution
A semiconductor light emitting device is designed with a light emitting diode that emits blue or ultraviolet light, exciting a semiconductor film to produce red or green light, enhancing the color rendering property by combining these emissions with yellow light from a YAG fluorescent material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a YAG fluorescent material is excited by blue light from a blue light emitting diode to produce yellow light, then the white light emitting diode can be commercialized for various applications, but the amount of red emission light in the emission spectrum is small and the color rendering property is inferior
Solution Approach 1:
The patent combines multiple light emitting components (blue light emitting diode, yellow light emitting YAG fluorescent material, and red light emitting fluorescent material) into a single integrated device. This merging allows the device to emit a broader spectrum including red light, thereby improving color rendering properties while maintaining manufacturing feasibility through a unified structure
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 results in a white light emitting diode with improved color rendering properties and higher brightness, capable of replacing traditional lighting sources like fluorescent and incandescent lamps.
Implementation Method 1
a light emitting diode for emitting first emission light; and a semiconductor film provided in a portion of the light emitting diode to absorb the first emission light and emit second emission light
Implementation Method 2
a white light emitting diode which provides white light by exciting a YAG fluorescent material with emission light from a blue light emitting diode and thereby obtains yellow emission light
Data Source
AI summary
A semiconductor light emitting device is composed of a blue light emitting diode, a red light emitting layer grown epitaxially on the blue light emitting diode, and an insulating material containing a YAG fluorescent material. The red light emitting layer is made of, e.g., undoped In0.4Ga0.6N having a forbidden band width of 1.9 eV and formed on a p-type semiconductor layer to have a configuration consisting of a plurality of mutually spaced-apart islands.