White Light Emitting Device Segmented Phosphor Molding
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Solution Overview
Problem
In white LED packages, the red phosphor absorbs wavelength-converted light, leading to reduced luminous efficiency of the emitted white light.
Innovation Solution
A white light emitting device with separate molding units for red, blue, and green phosphors, using rare earth or semiconductor-based phosphors, and a reflective film to prevent light absorption, along with a mold lens unit for scattering the converted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single molding unit containing mixed phosphors (red, green, blue) is used, then the device structure is simple, but the red phosphor resorbs wavelength-converted light reducing luminous efficiency
Solution Approach 1:
The single molding unit containing mixed phosphors is divided into multiple separate molding units, each containing only one type of phosphor (red, green, or blue). This segmentation prevents the red phosphor from resorbing wavelength-converted light generated by the blue and green phosphors, thereby improving luminous efficiency while maintaining manageable structural complexity
Solution Approach 2:
The red phosphor is extracted from the mixed phosphor mixture and placed in a separate molding unit from the blue and green phosphors. This extraction eliminates the harmful resorption interaction between the red phosphor and the wavelength-converted light from other phosphors, directly addressing the energy loss problem
2Manufacturing precision
If phosphors are mixed in a single molding unit, then manufacturing is simpler, but color rendering and color temperature control are less precise
Solution Approach 1:
The phosphor assembly is segmented into multiple molding units with different phosphor types, allowing independent optimization of color rendering and color temperature for each unit. This enables precise control over the spectral composition of the emitted light while maintaining ease of manufacture through modular assembly
Solution Approach 2:
Each molding unit is assigned a specific phosphor type with optimized properties for its intended function. The red phosphor unit, green phosphor unit, and blue phosphor unit each have locally optimized characteristics that contribute to overall color rendering and color temperature control, enabling precise spectral management
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
Improves white luminous efficiency by preventing red phosphor absorption of converted light, allowing for better light emission and adjustable color rendering and color temperature.
Implementation Method 1
a blue phosphor and a green phosphor, the blue phosphor and the green phosphor absorb the blue light and emit wavelength-converted light
Implementation Method 2
the red phosphor absorbs light having a wavelength converted by the blue phosphor and the green phosphor
Implementation Method 3
a reflective film to prevent light absorption
Implementation Method 4
a mold lens unit for scattering the converted light
Data Source
AI summary
There is provided a white light emitting device that prevents a red phosphor from resorbing wavelength-converted light to improve white luminous efficiency. A white light emitting device according to an aspect of the invention includes a package body; at least two LED chips mounted to the package body and emitting excitation light; and a molding unit including phosphors, absorbing the excitation light and emitting wavelength-converted light, in regions of the molding unit divided according to the LED chips and molding the LED chips. According to the aspect of the invention, since the phosphor for converted red light can be prevented from resorbing light generated from other regions of the molding unit, the white light emitting device that can improve white luminous efficiency or control color rendering and color temperature by adjusting a mixing ratio of converted light for white light emission.