Oxide Fluorescent Material Composition for Broad Red-NIR Emission
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Solution Overview
Problem
Current light emitting devices that emit light in the wavelength range from red to near-infrared light lack a wide full width at half maximum, making it difficult to effectively penetrate living tissues and obtain information deep inside the body, and they also require improvement in light emission characteristics for applications in plant growth and agricultural product analysis.
Innovation Solution
An oxide fluorescent material with a composition represented by the formula (Mg1-sM1s)2(Al1-tM2t)u(Ge1-vM3v)wOx:Cry,M4z, where M1, M2, M3, and M4 are specific elements, and s, t, u, v, w, x, y, and z satisfy certain molar ratios, is used in conjunction with a light emitting element to produce a light emitting device that emits light with a peak wavelength between 365 nm and 650 nm, allowing the oxide fluorescent material to emit light in the desired wavelength range with a wider full width at half maximum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional fluorescent materials are used, then light emission in red to near-infrared range is achieved, but the full width at half maximum is narrow, limiting tissue penetration depth
Solution Approach 1:
The patent changes the chemical composition parameters of the fluorescent material by incorporating multiple dopant elements (Mn4+, Cr3+, and M4) in specific molar ratios. This compositional parameter change broadens the emission spectrum full width at half maximum while maintaining intensity in the 680-1000 nm range, enabling deeper tissue penetration for medical imaging applications
Solution Approach 2:
The patent creates a composite fluorescent material by combining multiple dopant elements (Mn4+ at 0.01-0.5 mol%, Cr3+ at 0.01-0.1 mol%, and M4 at 0.01-0.1 mol%) within a single host lattice. This composite approach synergistically broadens the emission spectrum while maintaining the required intensity characteristics for both medical imaging and plant growth applications
2Reliability
If light emission peak is shifted to longer wavelengths for deeper tissue penetration, then near-infrared capability is improved, but light emission intensity in visible range decreases
Solution Approach 1:
The patent segments the emission spectrum coverage by assigning different dopant elements to different wavelength regions: Mn4+ provides 680-1000 nm near-infrared emission for deep tissue penetration, while Cr3+ and M4 contribute to visible light emission. This segmentation ensures both deep tissue penetration capability and sufficient visible light intensity for plant growth and general illumination applications
3Reliability
If fluorescent material composition is optimized for medical imaging, then tissue penetration is improved, but applicability to plant growth and agricultural analysis deteriorates
Solution Approach 1:
The patent achieves multi-functionality by formulating a fluorescent material with a broad emission spectrum (680-1000 nm) that simultaneously satisfies multiple application requirements: deep tissue penetration for medical imaging, red light emission for plant photosynthesis promotion, and near-infrared emission for agricultural product quality analysis. The specific dopant composition enables this single material to serve multiple purposes effectively
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 light emitting device achieves a light emission spectrum with a peak wavelength from red to near-infrared light and a wider full width at half maximum, enhancing the ability to penetrate living tissues and providing the necessary light intensity for applications in medical imaging, plant growth, and agricultural product analysis.
Implementation Method 1
a light emitting element emitting light having a light emission peak wavelength that is 365 nm or more and 650 nm or less and irradiating the oxide fluorescent material
Implementation Method 2
oxide fluorescent material having a composition represented by the following formula (1)... having a light emission spectrum with a light emission peak wavelength in a wavelength range from red light to near-infrared light and with a wider full width at half maximum
Data Source
AI summary
An oxide fluorescent material has a composition represented by the following formula (1).(Mg1-sM1s)2(Al1-tM2t)u(Ge1-vM3v)wOx:Cry,M4z (1)wherein M1 represents at least one element selected from the group consisting of Ca, Sr, Ba, and Zn; M2 represents at least one element selected from the group consisting of Ga, Sc, and In; M3 represents at least one element selected from the group consisting of Si, Ti, Zr, Sn, and Hf; M4 represents at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er, and Yb; and s, t, u, v, w, x, y, and z satisfy 0≤s≤1.0, 0≤t≤1.0, 1.5≤u≤2.5, 0≤v≤0.5, 3.0≤w≤6.0, 11.0≤x≤17.0, 0.005≤y≤1.0, and 0≤z≤0.5.