Red-Emitting Luminophore Composition for Efficient Wavelength Conversion
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Solution Overview
Problem
Existing luminophores have inefficiencies in wavelength conversion and spectral efficiency, particularly in generating red light for applications requiring high color rendering indices.
Innovation Solution
A luminophore with the formula A2EZzXx:RE is developed, where A, E, Z, and X are specific elements, and RE is an activator, allowing for efficient wavelength conversion from blue to red light, optimized for high spectral efficiency and reduced spectral breadth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If existing luminophores are used for wavelength conversion, then red light can be generated, but luminous efficacy is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the luminophore by incorporating specific activator elements (Mn4+, Co2+, Ni2+, Cu2+, or combinations) in controlled concentrations (0.01-10 at.% for Mn4+, 0.1-20 at.% for other activators). This parameter optimization enables precise tuning of the emission spectrum to match the photopic sensitivity curve, achieving luminous efficacy of 6% or more while reducing energy loss through improved quantum efficiency and reduced spectral breadth.
2Manufacturing precision
If spectral breadth is reduced to improve spectral efficiency, then color rendering improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs composite material strategies by combining host materials (such as oxides, fluorides, or their combinations) with multiple activator elements in specific ratios. This composite approach allows the luminophore to achieve narrow spectral breadth (full width at half maximum of 50-150 nm) while maintaining robust manufacturing tolerances, as the composite structure provides synergistic effects that enhance both spectral efficiency and color rendering index.
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 luminophore achieves a 6% increase in luminous efficacy compared to existing luminophores, with improved spectral efficiency and a high color rendering index, suitable for generating red or white light in LED sources.
Implementation Method 1
A luminophore is specified. The luminophore is able to convert electromagnetic radiation of a first wavelength or first wavelength range, referred to hereinafter as primary radiation, to electromagnetic radiation of a second wavelength or second wavelength range, referred to hereinafter as secondary radiation.
Data Source
AI summary
A luminophore may have the general formula A2EZzXx:RE,where:A is selected from the group of the monovalent elements;E is selected from the group of the tetravalent, pentavalent, or hexavalent elements;Z is selected from the group of the divalent elements;X is selected from the group of the monovalent elements;RE is selected from activator elements;2+e=2z+x, with the charge number e of the element E; andx+z=5 and z>0.A process is also disclosed that is directed to producing the luminophore and a corresponding radiation-emitting component.