Ga-Ge Oxide Fluorescent Material for Wide Near-Infrared Emission
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Solution Overview
Problem
Current light emitting devices struggle to emit light effectively in the wavelength range from red light to near-infrared light, which is essential for applications such as infrared cameras, plant growth promotion, and non-destructive analysis of food and pharmaceutical products, due to limitations in light absorption and scattering by living tissues and materials.
Innovation Solution
An oxide fluorescent material with a composition represented by the formula (Ga1-uM1u)2(Ge1-vM2v)wOx:Cry,M3z, where M1, M2, and M3 are specific elements, is developed to achieve a light emission peak wavelength in the range of 760 nm to 970 nm with a wider full width at half maximum, enabling efficient light emission in the near-infrared spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emitting devices are used, then visible light emission is achieved, but near-infrared light emission intensity is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the fluorescent material by incorporating specific elements (M1 from Al/Sc/In, M2 from Si/Ti/Zr/Sn/Hf, M3 from Ni/Eu/Fe/Mn/Nd/Tm/Ho/Er/Yb) in controlled ratios (u, v, w, x, y, z parameters) to tune the emission wavelength and intensity in the near-infrared region while maintaining visible light emission capabilities
Solution Approach 2:
The patent creates a composite fluorescent material combining multiple elements (Ga, M1, M2, Ge, Cr, M3) in a specific oxide structure (Ga1-uM1u)2(Ge1-vM2v)wOx to achieve simultaneous emission in both visible and near-infrared wavelengths, resolving the contradiction between intensity in one region and versatility across wavelength ranges
2Illumination intensity
If light emission in near-infrared range is enhanced, then penetration through tissues and materials improves, but light absorption and scattering by living tissues increases
Solution Approach 1:
The patent optimizes the emission spectrum parameters by adjusting the composition ratios (particularly the M3 element concentration z and oxygen stoichiometry x) to achieve peak emission in the 760-970 nm near-infrared range, where tissue penetration is maximized while absorption and scattering are minimized compared to other wavelength regions
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 oxide fluorescent material enhances light emission intensity and penetration through tissues and materials, facilitating non-destructive analysis and plant growth promotion, while providing a safer alternative to traditional light sources like tungsten or xenon lamps.
Implementation Method 1
a light emitting device including the oxide fluorescent material and a light emitting element emitting light having a light emission peak wavelength in a range of 365 nm or more and 650 nm or less and irradiating the oxide fluorescent material
Data Source
AI summary
An oxide fluorescent material has a composition represented by the following formula (1).(Ga1-uM1u)2(Ge1-vM2v)wOx:Cry,M3z (1),wherein M1 represents at least one element selected from the group consisting of Al, Sc, and In; M2 represents at least one element selected from the group consisting of Si, Ti, Zr, Sn, and Hf, M3 represents at least one element selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er, and Yb; and u, v, w, x, y, and z satisfy 0≤u≤1.0, 0≤v≤0.5, 1.0≤w≤3.0, 5≤x≤9, 0.005≤y≤1.0, and 0≤z≤0.5, respectively.