AlN Phosphor Ceramic Composition for Heat-Dissipating Light Emission
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Solution Overview
Problem
Current phosphor ceramics lack high thermal conductivity, which is essential for efficient heat dissipation and light emission properties.
Innovation Solution
A phosphor ceramic is developed containing aluminum nitride, yttrium, and manganese, with a low oxygen content of less than 2.4 mass %, manufactured by preparing a precursor with aluminum nitride and doping it with manganese, and then firing it in a nitrogen atmosphere at high temperatures to enhance thermal conductivity and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional phosphor ceramic materials are used, then light emission function is achieved, but thermal conductivity is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating aluminum nitride (AlN) as the base material and controlling oxygen content to less than 2.4 mass%, which fundamentally alters the thermal conductivity parameter of the phosphor ceramic from conventional low values to high values (150-260 W/(m·K)), resolving the contradiction between maintaining light emission and improving thermal conductivity
Solution Approach 2:
The patent creates a composite phosphor ceramic material combining aluminum nitride base material with manganese activator and controlled oxygen content, forming a new composite system that simultaneously achieves both high thermal conductivity and phosphor light emission properties, thereby resolving the contradiction between heat dissipation efficiency and light emission function
2Temperature
If oxygen content is reduced to less than 2.4 mass%, then thermal conductivity increases to 150-260 W/(m·K), but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-mixing aluminum nitride powder with manganese-containing compounds and sintering aids before the sintering process, establishing a controlled chemical composition that will yield the desired oxygen content <2.4 mass% after sintering, thereby achieving high thermal conductivity while managing manufacturing precision requirements through advance preparation
Solution Approach 2:
The patent employs an inert nitrogen atmosphere during the sintering process to prevent oxidation and control oxygen content in the final phosphor ceramic to less than 2.4 mass%, enabling high thermal conductivity (150-260 W/(m·K)) to be achieved while managing the precision requirements through controlled atmospheric conditions
3Temperature
If aluminum nitride is used as base material with manganese doping, then thermal conductivity reaches 150-260 W/(m·K), but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single phosphor ceramic material: aluminum nitride provides the high thermal conductivity matrix, manganese provides the phosphor activator function, and the controlled oxygen content ensures both thermal and optical performance, thereby achieving high thermal conductivity (150-260 W/(m·K)) while consolidating multiple material requirements into one composite material to manage device 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 resulting phosphor ceramic exhibits high thermal conductivity, efficient heat dissipation, and improved light emission properties, with thermal conductivity ranging from 150 W/(m·K) to 260 W/(m·K) and emission peaks in the 590 nm to 620 nm range, enabling effective heat management and light transmittance.
Implementation Method 1
a phosphor ceramic containing aluminum nitride, yttrium, and manganese, wherein a content of oxygen in the phosphor ceramic is less than 2.4 mass %
Implementation Method 2
a phosphor ceramic containing aluminum nitride, yttrium, and manganese... emission peaks in the 590 nm to 620 nm range
Data Source
AI summary
A method for manufacturing a phosphor ceramic, the method including preparing a precursor including aluminum nitride, and forming the phosphor ceramic by bringing the precursor into contact with a gas containing manganese.