Oxyfluoride Nitride Phosphor Composition for High-Temperature Brightness
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Solution Overview
Problem
Existing phosphors, such as La3Si6N11Ce, face challenges in achieving high brightness and maintaining light emission properties in high temperature regions, necessitating improvements in their performance.
Innovation Solution
A phosphor composition incorporating a nitride phosphor with specific ratios of rare earth elements, silicon, nitrogen, and cerium, along with an oxyfluoride content, is manufactured through controlled heat treatment to enhance brightness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional phosphors like La3Si6N11Ce are used, then the basic white light emission function is achieved, but the brightness and high temperature stability are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the phosphor by introducing oxyfluoride components and adjusting the ratios of rare earth elements (Eu, Tb, Dy) relative to cerium. This compositional parameter modification enables the phosphor to achieve both high brightness and improved high-temperature stability simultaneously, resolving the technical contradiction between illumination intensity and thermal reliability.
Solution Approach 2:
The invention creates a composite phosphor material by combining multiple rare earth elements (Eu, Tb, Dy, Ce) with oxyfluoride components in a specific matrix structure. This composite approach allows the material to exhibit enhanced optical properties and thermal stability that cannot be achieved with single-component phosphors, thereby simultaneously improving brightness and high-temperature reliability.
2Productivity
If the temperature raising rate during heat treatment is high, then the manufacturing efficiency is improved, but the phase purity and crystal structure quality of the phosphor deteriorate
Solution Approach 1:
The invention applies preliminary anti-action by implementing a controlled, slow heating rate (less than 50°C per hour) during the heat treatment process. This deliberate slowing of the temperature rise prevents premature phase formation and unwanted side reactions that would occur with rapid heating, thereby ensuring high phase purity and crystal structure quality while still achieving efficient manufacturing through optimized process parameters.
Solution Approach 2:
The invention optimizes the thermal processing parameters by setting a specific heating rate constraint (less than 50°C per hour) and maintaining treatment temperatures between 1,200-1,800°C. This parameter control ensures complete reaction and phase formation while preventing defects, achieving both high manufacturing precision and acceptable productivity through optimized process conditions.
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 resulting phosphor composition exhibits high brightness and suppresses degradation of light emission properties in high temperature regions, offering improved performance.
Implementation Method 1
obtaining a heat-treated substance by raising a temperature of the raw material mixture and heat-treating the raw material mixture at a predetermined temperature in a range of higher than 1,200° C. and 1,800° C. or lower
Implementation Method 2
heat-treating the raw material mixture at a predetermined temperature in a range of higher than 1,200° C. and 1,800° C. or lower
Implementation Method 3
converts the color of a portion of the light from a blue light emitting diode (LED) chip using a phosphor
Data Source
AI summary
Provided is a phosphor having superior light-emitting properties. A phosphor composition includes: a nitride phosphor that contains, in a composition thereof, an element M that is at least one selected from the group consisting of rare earth elements except cerium, silicon, nitrogen, and cerium; and an oxyfluoride. In the phosphor composition, a content of the oxyfluoride relative to the phosphor composition is 1.5% by mass or higher and 10% by mass or lower according to an X-ray diffraction reference intensity ratio method.