Infrared Phosphor Composition for Thermal-Resistant Blue Light Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current phosphors used in light emitting devices are prone to thermal degradation, which affects their longevity and reliability, especially when converting blue light into infrared light, a requirement for industrial applications.
Innovation Solution
A phosphor powder with a composition of Eu(1-x)(1-z)M1xM2(1-x)z)2(Si1-yAly)5N8, where M1 includes La and optionally other lanthanoid elements, M2 includes Ba and optionally Mg, Ca, or Sr, with specific substitution ratios (x, y, z) that enhance thermal resistance and fluorescence properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphors are used to convert blue light into infrared light, then wavelength conversion function is achieved, but thermal degradation occurs reducing reliability
Solution Approach 1:
The patent modifies the chemical composition parameters of the phosphor by substituting specific elements (La, Ba, Mg, Ca, Sr) at controlled ratios (x, y, z parameters) to optimize thermal stability while maintaining infrared emission properties
Solution Approach 2:
The patent creates a composite phosphor material combining multiple elements (Eu, La, Ba, Mg, Ca, Sr, Si, N, Al) in a specific composite structure represented by the formula Eu(1-x)(1-z)M1xM2(1-x)z)2(Si1-yAly)5N8 to achieve enhanced thermal resistance
2Reliability
If phosphor composition is modified to improve thermal resistance, then thermal stability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by selectively substituting specific elements at specific lattice positions (M1 for lanthanoids, M2 for alkaline earth metals) with controlled substitution ratios to achieve thermal stability without uniformly complicating the entire structure
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 phosphor powder effectively converts blue light into infrared light with reduced thermal degradation and quenching, making it suitable for applications with severe temperature changes, such as in-vehicle uses, while maintaining high emission intensity.
Implementation Method 1
phosphors capable of converting blue light into infrared light having a wavelength of longer than 700 nm (near-infrared light)
Data Source
AI summary
A phosphor powder containing a phosphor represented by General Formula (I) below. In General Formula (I), M1 includes at least La and optionally further includes one or more elements selected from the group made of lanthanoid elements other than Y and La, M2 includes at least Ba and optionally further includes one or more elements selected from the group made of Mg, Ca, and Sr, x is equal to or more than 0.005 and equal to or less than 0.2, y is equal to or more than 0 and equal to or less than 0.1, and z is more than 0.44 and equal to or less than 0.99: (Eu(1-x)(1-z)M1xM2(1-x)z)2(Si1-yAly)5N8 . . . (I).