Multi-Chip Light-Emitting Element With Isolated Phosphor Excitation
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Solution Overview
Problem
Existing light emitting devices using phosphors suffer from decreased luminous efficiency and difficulty in achieving a spectral power distribution similar to sunlight, leading to potential damage to the human eye and retina due to abnormal light in the blue region.
Innovation Solution
A light emitting device comprising multiple LED chips with different peak wavelengths and specific wavelength conversion materials, where each conversion material's peak excitation spectrum is closer to its respective LED chip's peak wavelength, and light is blocked from crossing over to prevent inefficient conversion, using suitable housings and molding materials to enhance efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphors are used for wavelength conversion to achieve a spectral power distribution similar to sunlight, then the spectral quality is improved, but luminous efficiency decreases
Solution Approach 1:
The patent divides the wavelength conversion function into multiple segments by using different phosphors for different wavelength ranges. Specifically, it uses a first phosphor for converting blue light to green, a second phosphor for converting blue light to red, and a third phosphor for converting violet light to blue. This segmentation allows each phosphor to operate at optimal efficiency for its specific wavelength conversion task, thereby maintaining high luminous efficiency while achieving a complete spectral power distribution similar to sunlight.
2Illumination intensity
If a larger amount of phosphors is used for wavelength conversion to achieve sunlight-like spectrum, then spectral quality is improved, but luminous efficiency decreases due to increased conversion losses
Solution Approach 1:
The patent applies local quality by optimizing the phosphor composition and distribution for specific wavelength regions. Each phosphor is strategically selected and positioned to convert light in its optimal efficiency range: the first phosphor (green emission) converts blue light, the second phosphor (red emission) converts blue light, and the third phosphor (blue emission) converts violet light. This localized optimization ensures that each phosphor operates at peak efficiency, minimizing Stokes shift losses while achieving complete spectral coverage.
3Reliability
If phenyl-based silicone is used as molding material to prevent moisture penetration, then moisture resistance is improved, but it cannot be used with ultraviolet or violet light emitting diodes due to light modification
Solution Approach 1:
The patent employs composite materials by combining phenyl-based silicone with UV stabilizers and antioxidants. This composite formulation maintains the excellent moisture barrier properties of phenyl-based silicone while adding protective components that prevent degradation from UV and violet light exposure. The composite material thus achieves both high reliability in moisture prevention and adaptability for use with ultraviolet and violet light emitting diodes.
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 increases luminous efficiency and reduces harmful blue light exposure, achieving a spectral power distribution closer to sunlight, thereby minimizing eye damage and enhancing overall device performance.
Implementation Method 1
a first wavelength conversion material disposed over the first light emitting diode chip and converting a wavelength of light emitted from the first light emitting diode chip
Implementation Method 2
a second wavelength conversion material disposed over the second light emitting diode chip and converting a wavelength of light emitted from the second light emitting diode chip
Data Source
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AI summary
Provided are a light-emitting element and a lighting fixture having same. A light-emitting element according to one embodiment comprises: a first light-emitting diode chip emitting light having a first peak wavelength; a second light-emitting diode chip emitting light having a second peak wavelength longer than the first peak wavelength; a first wavelength conversion material that is disposed on the first light-emitting diode chip and converts the wavelength of the light emitted from the first light-emitting diode chip; and a second wavelength conversion material that is disposed on the second light-emitting diode chip and converts the wavelength of the light emitted from the second light-emitting diode chip. The peak wavelength of the excitation spectrum of the first wavelength conversion material is closer to a first peak wavelength than a second peak wavelength, and the peak wavelength of the excitation spectrum of the second wavelength conversion material is closer to the second peak wavelength than the first peak wavelength. Light that travels from the first light-emitting diode chip to the second wavelength conversion material is blocked, and light that travels from the second light-emitting diode chip to the first wavelength conversion material is blocked.