Infrared Fluoride Phosphor Broad Emission via Cr3+ Activation
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Solution Overview
Problem
Conventional infrared light emitting devices lack a broad emission wavelength, limiting their application in various sensing devices such as food inspection and cancer detection, and require complex synthesis processes.
Innovation Solution
A novel infrared emitting fluoride phosphor with a Cr3+ activation center, specifically A3B1-xF6:xCr3+ or A3B1-y-zF6:yCr3+, zNi2+, is developed, which can be synthesized at room temperature and emits infrared rays with a broad spectrum when excited by a light source of 400-700 nm, offering a peak emission wavelength of 735-750 nm and a full width at half maximum (FWHM) of 90-110 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional infrared phosphor materials are used, then the device structure is simple, but the emission wavelength range is narrow
Solution Approach 1:
The patent uses composite fluoride phosphor materials with specific crystal structures (e.g., A3B1-xF6:xCr3+ where A=Li, Na, K, Rb, Cs and B=Al, Ga) to achieve broad infrared emission. The composite nature of these materials allows simultaneous coverage of multiple wavelength bands while maintaining a relatively simple single-phosphor system rather than requiring multiple phosphors combined together.
2Ease of manufacture
If conventional phosphor synthesis methods are used, then the material composition is simple, but the synthesis process is complex
Solution Approach 1:
The patent employs solvothermal synthesis method with controlled parameters (temperature, pressure, solvent type, reaction time) to produce complex fluoride phosphor compositions. By optimizing synthesis parameters such as using specific solvents (water, alcohol, acid), temperature ranges (100-200°C), and pressure conditions, the method simplifies the manufacturing process while achieving precise control over the complex material composition and crystal structure.
3Adaptability or versatility
If broadband emission is achieved through multiple phosphors, then the emission spectrum is broad, but the device structure becomes complex
Solution Approach 1:
The patent designs single-phase composite fluoride phosphors with general formula A3B1-xF6:xCr3+ that inherently provide broadband infrared emission through their crystal structure and activator doping. This approach achieves broad emission spectrum (covering 700-1000 nm and beyond) while maintaining a simple single-phosphor system, avoiding the complexity of combining multiple separate phosphor materials.
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 infrared light emitting device incorporating this phosphor provides a broad emission wavelength, enhancing its applicability in diverse fields and simplifying the manufacturing process, allowing it to replace conventional devices and be used with other phosphors or LEDs for expanded functionality.
Implementation Method 1
the infrared emitting fluoride phosphor is excited by a light source of a wavelength of 400-700 nm to emit an infrared ray
Data Source
AI summary
An infrared emitting fluoride phosphor and an infrared light emitting device are provided. The infrared emitting fluoride phosphor includes an activation center of Cr3+. The infrared light emitting device includes a light source and the infrared emitting fluoride phosphor. The light source is disposed to emit a first light, and the first light has a wavelength of 400-700 nm. The infrared emitting fluoride phosphor is configured to be excited by the first light to emit a first infrared ray. The first infrared ray has a wavelength of 650-1000 nm. The infrared light emitting device has a broad emission wavelength, such that it can be applied in variety of sensing device.