Fluorescent Material Eu Ratio Optimization for High Intensity
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Solution Overview
Problem
Conventional fluorescent materials have limited light emission intensity, which hampers the performance of light emitting devices in various applications.
Innovation Solution
A fluorescent material comprising specific elements such as Sr, Eu, Si, Al, O, and N, with a molar ratio of Eu to the sum of Sr and Eu being 0.06 or less, forming a crystal structure similar to Sr4.5Si12.5Al3.5O5.5N19.5, enhancing light emission intensity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional fluorescent materials are used, then the light emitting device can be manufactured with existing materials, but the light emission intensity is limited and insufficient for high output requirements
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of Eu to (Sr+Eu) at 0.06 or less, and optimizing the stoichiometric ratios of Si, Al, O, and N elements. This parameter optimization resolves the contradiction by achieving high light emission intensity through controlled composition while maintaining performance consistency through defined compositional ranges.
Solution Approach 2:
The patent employs composite materials by combining multiple elements (Sr, Eu, Si, Al, O, N) in specific ratios to create a new fluorescent material composition. This composite approach resolves the technical contradiction by integrating the benefits of different elements to achieve both high light emission intensity and reliable performance consistency.
2Illumination intensity
If the molar ratio of M element is increased to enhance light emission, then light emission intensity improves, but the crystal structure stability and material properties deteriorate
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing the optimal molar ratio of M element to (A+M) at 0.06 or less. This specific parameter range maintains crystal structure stability while achieving high light emission intensity, preventing the deterioration of material properties that would occur with higher M element concentrations.
Solution Approach 2:
The patent applies partial action by using a limited amount of M element (0.06 or less molar ratio) rather than excessive amounts. This partial incorporation of the activator element is sufficient to achieve high light emission intensity while preserving the stability of the host crystal structure.
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 fluorescent material achieves high light emission intensity and improved light emitting properties, leading to enhanced performance in light emitting devices for general lighting, in-vehicle lighting, and display devices.
Implementation Method 1
Fluorescent materials are used for light emitting devices that emit light, such as a white color, a bulb color, and an orange color, through a combination with a light emitting element, such as a light emitting diode (LED). These fluorescent materials are excited by, for example, a blue light emitted from a light emitting element, thereby emitting a luminescent color
Data Source
AI summary
Provided are a fluorescent material including a high light emission intensity and a light emitting device using the same. The present fluorescent material includes at least an A element, a M element, a D element, a E element, and an X element, wherein the A element is at least one element selected from the group consisting of Sr, Mg, Ca, and Ba; the M element is at least one element selected from the group consisting of Eu, Mn, Ce, Pr, Nd, Sm, Tb, Dy, and Yb; the D element is at least one element selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf, the E element is at least one element selected from the group consisting of Al, B, Ga, In, Sc, Y, and La; the X element is at least one element selected from the group consisting of O, N, and F; and a molar ratio of the M element to the sum of the A element and the M element [M/(A+M)] is 0.06 or less.