Alpha-Sialon Phosphor Surface Recesses for Fluorescence
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Solution Overview
Problem
The fluorescence characteristics of α-sialon phosphor particles vary based on their surface shape, and existing methods do not effectively enhance these characteristics.
Innovation Solution
Forming at least one minute recess on the surface of α-sialon phosphor particles, which are then incorporated into a composite with a sealing material and used in a light-emitting device to improve fluorescence properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If classification treatment by average particle diameter is performed to improve fluorescence characteristics, then fluorescence efficiency is improved, but particle surface shape control is lost
Solution Approach 1:
The invention applies local quality by creating minute recesses at specific locations on the phosphor particle surface. Rather than uniformly treating the entire surface, the recesses are formed locally to modify light interaction at critical areas, thereby improving fluorescence efficiency while maintaining control over the overall particle shape characteristics.
Solution Approach 2:
The invention changes the surface parameter of the phosphor particles by introducing minute recesses with specific dimensional characteristics (depth of 1-100 nm, diameter of 1-1000 nm). This parameter modification enhances fluorescence efficiency by altering light absorption and emission properties at the particle surface while maintaining precise control over the surface morphology.
2Use of energy by moving object
If minute recesses are formed on phosphor particle surface to improve fluorescence characteristics, then fluorescence efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The invention uses an intermediary approach by employing a liquid crystal composition as a masking agent during the formation of minute recesses. This liquid crystal composition selectively positions itself on the particle surface, guiding the formation of recesses at specific locations without requiring complex direct patterning equipment, thus improving fluorescence efficiency while managing manufacturing complexity.
Solution Approach 2:
The invention replaces complex mechanical patterning systems with a chemical-self-organizing approach. By utilizing the self-assembly properties of liquid crystal compositions and chemical etching processes, the minute recesses are formed through non-mechanical means, reducing manufacturing complexity while achieving the desired surface morphology for enhanced fluorescence efficiency.
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 technique enhances the fluorescence characteristics of α-sialon phosphor particles while maintaining the excitation wavelength range, leading to improved light emission characteristics in light-emitting devices.
Implementation Method 1
a step of subjecting the α-sialon phosphor particle obtained by the pulverizing step to an acid treatment to form a minute recess on a surface of the α-sialon phosphor particle
Implementation Method 2
an α-sialon phosphor particle containing Eu, in which at least one minute recess is formed on a surface of the α-sialon phosphor particle
Data Source
AI summary
An α-sialon phosphor particle containing Eu. At least one minute recess is formed on a surface of the α-sialon phosphor particle. The α-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.