LED Package with Dual Blue Wavelengths and Phosphor Conversion
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Solution Overview
Problem
Conventional light emitting diode (LED) packages face limitations in achieving efficient white light emission due to the low energy of longer blue wavelengths, which restricts light emitting efficiency and color control.
Innovation Solution
A light emitting device package is designed with a blue light emitting device and a first phosphor that emits a second blue wavelength, differing from the first by about 5-69 nm, to enhance light emitting efficiency and color control, using a resin layer with specific phosphor materials like Sr2MgSi2O7:Eu2+ and BaMgAl10O17:Eu(Mn) to achieve white color control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional LED package uses a single blue wavelength light emitting device, then the structure is simple, but the light emitting efficiency and color control are limited
Solution Approach 1:
The patent combines multiple light emitting devices with different blue wavelengths (first blue wavelength and second blue wavelength) into a single package, along with phosphors that convert these wavelengths. This merging of multiple light sources and conversion materials resolves the contradiction by achieving superior light emitting efficiency and color control while maintaining a relatively integrated package structure.
Solution Approach 2:
The patent employs composite material strategies by combining different phosphor materials (e.g., Sr2MgSi2O7:Eu2+, BaMgAl10O17:Eu(Mn)) with multiple blue wavelength light emitting devices. This composite approach enables enhanced light emitting efficiency and precise color control, addressing the productivity concern while the integrated package design maintains manufacturing feasibility.
2Illumination intensity
If longer blue wavelengths are used, then the color balance is improved, but the light emitting efficiency decreases due to low energy
Solution Approach 1:
The patent applies parameter changes by utilizing multiple blue wavelengths (different energy parameters) simultaneously - a first blue wavelength and a second blue wavelength with longer wavelength and lower energy. By combining these different wavelength parameters and using phosphor conversion, the system achieves improved color balance while compensating for the lower energy of longer wavelengths through the combined output of multiple devices.
Solution Approach 2:
The patent uses composite phosphor materials (such as Sr2MgSi2O7:Eu2+ and BaMgAl10O17:Eu(Mn)) in combination with multiple blue wavelength light emitting devices. This composite material strategy enables the system to convert different blue wavelengths into a balanced spectrum, achieving good color balance while maintaining overall light emitting efficiency by leveraging the strengths of each wavelength component.
3Adaptability or versatility
If multiple phosphors with different wavelengths are used, then the color control is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges multiple light emitting devices and multiple phosphor materials into a single integrated package structure. By combining the first blue wavelength device, second blue wavelength device, and phosphors (such as Sr2MgSi2O7:Eu2+, BaMgAl10O17:Eu(Mn)) within one package, the system achieves enhanced color control while avoiding the complexity of separate systems through integrated design.
Solution Approach 2:
The patent implements multi-functionality by designing a single package that performs multiple functions: generating first blue wavelength light, generating second blue wavelength light, converting these wavelengths through phosphors, and producing a balanced white or colored light output. This universal package design enhances color control adaptability while avoiding the complexity of multiple separate devices.
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 improves light emitting efficiency and emotional lighting effects by increasing the blue component emission while maintaining color coordinate values, allowing for better control of white color balance and maximizing emotional lighting effects.
Implementation Method 1
a first phosphor that emits a second blue wavelength by exciting some light having the first blue wavelength
Data Source
AI summary
A light emitting device package of the embodiment includes a body including cavities; first and second lead electrodes disposed in the cavity of the body; a light emitting device disposed in the cavities, electrically connected to at least one of the first and second lead electrodes and emitting a first main peak wavelength in the range of 410˜460 nm; and a first resin layer having first phosphor on the light emitting device, wherein the first phosphor of the first resin layer emits light of a second main peak wavelength in the range of 461 nm˜480 nm by exciting some light having the first main peak wavelength, and the first and second main peak wavelengths have the wavelength different from each other and contain the light having the same color.