Oxynitride Phosphor Pillar Particles Dispersion Fluidity
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Solution Overview
Problem
Current semiconductor light emitting devices face challenges in process properties, particularly in the dispersion and fluidity of phosphor particles, which affect their integration and performance in light emitting devices.
Innovation Solution
Development of an oxynitride-based phosphor with a β-type Si3N4 crystal structure and a compositional formula of Si6−xAlxOxN8−x:Euy, featuring primary particles with pillar shapes that are bonded to form secondary particles with improved fluidity and uniform dispersion, allowing for enhanced processability and light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional phosphor particles are used, then light emission function is achieved, but fluidity and dispersion properties are poor
Solution Approach 1:
The phosphor is divided into primary particles with pillar shape and secondary particles formed by bonding multiple primary particles. This segmentation allows the primary particles to maintain good fluidity while the secondary particles ensure uniform dispersion when incorporated into light emitting devices.
Solution Approach 2:
The invention creates a composite particle structure where multiple primary particles are bonded together to form secondary particles. This composite structure combines the fluidity advantages of small pillar-shaped particles with the dispersion benefits of larger aggregated structures.
2Manufacturing precision
If phosphor processing is performed, then light emitting device performance is improved, but processing time increases
Solution Approach 1:
The phosphor particles are pre-formed with optimal pillar shape and secondary particle structure before incorporation into the light emitting device. This preliminary structuring ensures that no additional processing time is required during device manufacturing, as the particles are already optimized for both fluidity and dispersion.
3Reliability
If phosphor particles are aggregated, then dispersion is improved, but fluidity decreases
Solution Approach 1:
The aggregation is performed at the secondary particle level rather than creating large random aggregates. By bonding a controlled number of pillar-shaped primary particles into secondary particles, the structure maintains fluidity while achieving uniform dispersion characteristics.
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 oxynitride-based phosphor exhibits increased fluidity and uniform dispersion, reducing processing time and improving the performance of light emitting devices by emitting light in the desired wavelength range, specifically green light, and enhancing the overall efficiency of wavelength conversion.
Implementation Method 1
the oxynitride-based phosphor... converting a wavelength of at least a portion of the excitation light into a wavelength of green light
Data Source
AI summary
There is provided an oxynitride-based phosphor comprising a β-type Si3N4 crystal structure and represented by a compositional formula of Si6−xAlxOxN8−x:Euy (0<x≦0.3, 0.001≦y≦0.03), the oxynitride-based phosphor having a form of a secondary particle comprising a plurality of primary particles bonded to each other, the plurality of primary particles having pillar shapes.