α-Type Sialon Phosphor Plates with Iβ/Iα Phase-Ratio Control
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Solution Overview
Problem
Existing phosphor plates, particularly those using α-type sialon phosphor, suffer from decreased light emission intensity, necessitating improvements in optical characteristics for enhanced performance.
Innovation Solution
The phosphor plate is designed with a specific ratio (Iβ/Iα ≤ 10) of peak intensities in an X-ray diffraction pattern, using a α-type sialon phosphor dispersed in a base material, to stabilize optical characteristics and improve light emission intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If α-type sialon phosphor is used in a plate-like wavelength conversion member, then the phosphor plate can be manufactured with standard materials, but the light emission intensity decreases
Solution Approach 1:
The patent applies parameter changes by controlling the crystalline phase composition ratio of the sialon phosphor. Specifically, it defines a range for the β-phase content (5-20 mass%) and controls the Iβ/Iα ratio in X-ray diffraction patterns to optimize light emission intensity while maintaining manufacturability with standard materials.
Solution Approach 2:
The patent uses composite materials by combining α-type sialon phosphor with a glass matrix base material. This composite structure allows the phosphor particles to be dispersed in a transparent matrix, improving light transmission and emission intensity while maintaining ease of manufacture through standard ceramic processing techniques.
2Ease of manufacture
If the crystalline phase composition of sialon phosphor is not controlled, then the manufacturing process is simple, but the optical characteristics become unstable
Solution Approach 1:
The patent implements feedback by using X-ray diffraction analysis to measure the Iβ/Iα ratio of the phosphor phases and adjusting the manufacturing process accordingly. This feedback mechanism ensures that the β-phase content remains within the optimal range of 5-20 mass%, stabilizing optical characteristics while maintaining relatively simple manufacturing processes.
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 results in a phosphor plate with improved light emission intensity and stability, suitable for use in light emitting devices, enhancing luminance and durability.
Implementation Method 1
a plate-like composite including a base material and an α-type sialon phosphor present in the base material
Implementation Method 2
in an X-ray diffraction analysis pattern of the phosphor plate using a Cu-Kα ray, in a case in which peak intensity corresponding to the α-type sialon phosphor having a diffraction angle 2θ in a range of 30.2° or more and 30.4° or less is defined as Iα
Data Source
AI summary
A phosphor plate includes a plate-like composite including a base material and an α-type sialon phosphor present in the base material, in which, in an X-ray diffraction analysis pattern using a Cu-Kα ray, in a case in which peak intensity corresponding to the α-type sialon phosphor having a diffraction angle 2θ in a range of 30.2° or more and 30.4° or less is defined as Iα and peak intensity of a peak having a diffraction angle 2θ in a range of 26.6° or more and 26.8° or less is defined as Iβ, Iα, and Iβ satisfy 0<Iβ/Iα≤10.