Nitride Phosphor Particle Morphology for Higher Luminous Flux
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Solution Overview
Problem
Existing nitride phosphors used in light emitting devices do not provide sufficient luminous flux, limiting the performance of these devices.
Innovation Solution
A nitride phosphor with a specific composition and particle characteristics, including a range of molar content ratios and shape parameters, is developed to enhance luminous flux by reducing light emission loss through uniform dispersion in a resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional nitride phosphors are used in light emitting devices, then the device structure is simple and easy to manufacture, but the luminous flux is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratios of elements (Eu: 0.002-0.08, Si: 0.8-1.2, Al: 1.0, Group 2 element: 0.8-1.1) and particle shape parameters (aspect ratio: 0.72-0.77, circularity: 0.82-0.92) to optimize luminous flux. This systematic parameter optimization resolves the contradiction by achieving high productivity through controlled compositional and morphological variations rather than complex structural changes.
Solution Approach 2:
The patent uses composite materials by combining multiple elements (Eu, Si, Al, N, and Group 2 elements) in specific proportions to create a nitride phosphor with enhanced luminous properties. This composite approach increases luminous flux while maintaining manageable composition complexity through defined ratios.
2Productivity
If phosphor particles are dispersed in resin to reduce light emission loss, then luminous flux increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies spheroidality by controlling particle shape with high circularity (0.82-0.92) and specific aspect ratios (0.72-0.77). This near-spherical morphology reduces light emission loss and improves dispersion uniformity in resin, thereby increasing luminous flux while actually reducing manufacturing precision requirements compared to irregular shapes.
Solution Approach 2:
The patent uses parameter changes by optimizing particle shape parameters (circularity and aspect ratio) to achieve uniform dispersion in resin. This resolves the contradiction by showing that controlled geometric parameters improve both luminous flux and manufacturing feasibility.
3Loss of energy
If the phosphor composition is optimized for higher luminous flux, then light emission loss is reduced, but the composition control complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing specific molar ratio ranges for each element (Eu: 0.002-0.08, Si: 0.8-1.2, Al: 1.0, Group 2 element: 0.8-1.1) that balance light emission efficiency with manageable composition control. This resolves the contradiction by showing that targeted parameter optimization reduces energy loss without proportionally increasing control complexity.
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 nitride phosphor achieves higher luminous flux by minimizing light reabsorption and emission loss, resulting in improved performance of light emitting devices.
Implementation Method 1
a light emitting element having an emission peak wavelength in a range of 365 nm to 500 nm
Data Source
AI summary
A nitride phosphor, having a composition that contains Eu, Si, Al, N, and a Group 2 element containing at least one selected from the group consisting of Mg, Ca, Sr, and Ba. With respect to a molar content of Al in the composition, a ratio of a total molar content of the Group 2 element and Eu is in a range of 0.8 to 1.1, a ratio of a molar content of Eu is in a range of 0.002 to 0.08, a ratio of a molar content of Si is in a range of 0.8 to 1.2, and a ratio of a total molar content of Si and Al is in a range of 1.8 to 2.2. The nitride phosphor has an average value of an aspect ratio, which is a minor-axis-to-major-axis ratio, in a range of 0.72 to 0.77, and an average circularity in a range of 0.82 to 0.92.