Ca-Mg-Si-O-Cl Phosphor for Stable Color Rendition in Light Emitting Devices
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Solution Overview
Problem
Existing light emitting devices with phosphors struggle to achieve stable color rendition and high productivity due to variations in emission wavelength, making it difficult to control color and brightness effectively.
Innovation Solution
A light emitting device incorporating a phosphor with the chemical formula Ca 8-x Eu x Mg 1-y Mn y (SiO 4 ) 4 Cl 2, which exhibits stable emission characteristics and high radiation efficiency by absorbing excitation light in the blue range, combined with additional phosphors to achieve a broad emission spectrum and high color rendering index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphors are used in light emitting devices, then the device can emit light with different wavelengths, but the emission wavelength varies and color rendition becomes unstable
Solution Approach 1:
The patent changes the chemical composition parameters of the phosphor by incorporating specific ratios of Eu and Mn dopants in the Ca-Mg-Si-O-Cl phosphor system. By adjusting the doping concentrations (x and y in the formula Ca8-xEuxMg1-yMny(SiO4)4Cl2), the emission wavelength and color coordinates can be precisely controlled while maintaining stable color rendition properties.
Solution Approach 2:
The patent uses a composite phosphor material combining Ca-Mg-Si-O-Cl host lattice with dual dopants (Eu and Mn). This composite structure allows the phosphor to exhibit both stable emission characteristics and tunable color properties, resolving the contradiction between wavelength control and color stability.
2Reliability
If multiple phosphors are combined to achieve broad emission spectrum, then color rendering index improves, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple phosphors into a single composite phosphor material. Instead of using separate phosphor layers or particles, the Ca-Mg-Si-O-Cl phosphor with Eu and Mn dopants integrates multiple emission characteristics into one material, achieving broad emission spectrum and high color rendering index while simplifying the device structure.
Solution Approach 2:
The composite phosphor material performs multiple functions simultaneously: it provides broad emission spectrum coverage, achieves high color rendering index, and maintains stable color coordinates. This multi-functional phosphor eliminates the need for complex multi-phosphor systems.
3Loss of energy
If phosphor composition is optimized for stable emission, then radiation efficiency improves, but flexibility in adjusting chromaticity decreases
Solution Approach 1:
The patent introduces dynamic adjustability in phosphor composition by varying the dopant ratios (x and y parameters in the formula). This allows the chromaticity to be dynamically tuned across a range of values while maintaining high radiation efficiency, transforming a static phosphor into a tunable light emission system.
Solution Approach 2:
By changing the chemical composition parameters (dopant concentrations and ratios), the patent achieves both high radiation efficiency and flexible chromaticity adjustment. The specific parameter ranges identified in the patent enable optimization of both efficiency and color tunability.
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 enables stable emission characteristics, improved productivity, and high-level color rendition with flexibility in adjusting chromaticity and brightness, achieving a white light source with high brightness and color rendering index.
Implementation Method 1
phosphors are excited by light emitted from the light emitter, and emit light different in a wavelength from the excitation light
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
According to an embodiment, a light emitting device (1, 2, 3) includes a light emitter (15) having an emission peak in a wavelength range of not less than 360 nanometers and not more than 470 nanometers, and a first phosphor (31) having a composition represented by the chemical formula of Ca8-xEuxMg1-yMny(SiO4)4Cl2 (0 < x ≤ 8, 0 ≤ y ≤ 1).