Light Emitting Device Filler Material Wavelength Selection
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Solution Overview
Problem
Existing light emitting devices face a trade-off between high color rendering and light emission efficiency, as materials like neodymium oxide and glass absorb specific wavelengths, reducing overall light emission efficiency.
Innovation Solution
Incorporating neodymium hydroxide, neodymium aluminate, or neodymium silicate as filler materials in the sealing member of light emitting devices, which absorb and reflect specific wavelengths, enhancing color rendering while maintaining high light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If neodymium oxide or glass containing neodymium is used to improve color rendering, then the color rendering index is improved, but the light emission efficiency is reduced due to absorption of light in specific wavelength ranges
Solution Approach 1:
The patent changes the chemical composition parameter of the filler material from neodymium oxide to neodymium hydroxide, neodymium aluminate, or neodymium silicate. These alternative compounds have different optical absorption characteristics that allow them to enhance color rendering while absorbing less light in the visible spectrum, thereby maintaining higher light emission efficiency
Solution Approach 2:
The patent uses composite filler materials containing neodymium in the form of hydroxide, aluminate, or silicate compounds instead of pure neodymium oxide. These composite materials combine the color rendering benefits of neodymium with the optical transparency advantages of hydroxide, aluminate, or silicate structures, achieving both high color rendering and high light emission efficiency
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 use of these materials allows for improved color rendering and increased light emission efficiency by optimizing the reflectance and absorption properties within specific wavelength ranges, surpassing the limitations of previous technologies.
Implementation Method 1
The phosphor can be excited by light of the light emitting element, and emit luminescent radiation
Implementation Method 2
Neodymium oxide and glass containing neodymium absorb light in specific wavelength ranges
Implementation Method 3
The filler material contains neodymium hydroxide, neodymium aluminate or neodymium silicate... optimizing the reflectance and absorption properties within specific wavelength ranges
Data Source
AI summary
A light emitting device includes a light emitting element, a molded member, and a sealing member. The light emitting element is arranged on or above the molded member. The sealing member covers the light emitting element. The sealing member contains a phosphor, and a filler material. The phosphor can be excited by light of the light emitting element, and emit luminescent radiation. The filler material contains neodymium hydroxide, neodymium aluminate or neodymium silicate. The filler material absorbs a part of the spectrum of the mixed light of the light emitting element and the phosphor so that the other parts of the spectrum of this mixed light are extracted from the light emitting device.