Phosphor Composition for White Light Color Rendering
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Solution Overview
Problem
Existing light emitting devices face challenges in achieving improved color rendering index and luminous flux, particularly due to uneven operation voltages across RGB chips and limited color reproducibility when producing white light.
Innovation Solution
A phosphor composition comprising a cyan phosphor emitting in the blue-green wavelength range, a green phosphor emitting in the green wavelength range, and a red phosphor emitting in the red wavelength range, excited by a blue light source, with specific chemical formulations and weight ratios to enhance light intensity and color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single blue LED chip with phosphor is used to produce white light, then the device complexity is reduced, but the color rendering index and luminous flux are insufficient
Solution Approach 1:
The patent uses a composite phosphor system combining three different phosphor materials with specific emission characteristics. The first phosphor (480-520nm), second phosphor (520-560nm), and third phosphor (560-600nm) work together to create a comprehensive spectral distribution that improves color rendering while maintaining a simple single-chip structure.
2Illumination intensity
If multiple phosphors are combined to improve color rendering, then the color rendering index is improved, but the luminous flux in certain wavelength regions becomes insufficient
Solution Approach 1:
The patent optimizes the emission peak wavelengths and intensity ratios of the three phosphors to achieve both improved color rendering and sufficient luminous flux. By carefully selecting the phosphor parameters (wavelength ranges: 480-520nm, 520-560nm, 560-600nm) and their relative intensities, the system achieves CRI improvement while maintaining overall luminous flux through coordinated spectral distribution.
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 phosphor composition increases light intensity in the blue-green region, improves color rendering index, and shortens the wavelength in the red region, resulting in enhanced luminous flux and color reproduction.
Implementation Method 1
a first phosphor that is excited by an excitation light source and emits light in a first wavelength range; a second phosphor excited by the excitation light source to emit light in a second wavelength range; and a third phosphor which is excited by the excitation light source and emits light in a third wavelength range
Data Source
AI summary
An embodiment relates to a phosphor composition, a light-emitting device package comprising the same, and a lighting apparatus and, more particularly, to a phosphor composition comprising a first phosphor, excited by an excitation light source, for emitting a first wavelength range of light, a second phosphor, excited by the excitation light source, for emitting a second wavelength range of light, and a third phosphor, excited by the excitation light source, for emitting a third wavelength range of light. The light emitted from the phosphor composition exhibits an increased intensity of light in a blue-green wavelength region with the consequent improvement of color rendering index and a shortened wavelength of light in a red wavelength region with the consequent improvement of luminous flux.