Cr3+ Phosphor Composition for Near-Infrared Vital Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting devices used in noncontact vital sensing systems have insufficient emission intensity in the near-infrared range, failing to adequately cover the low light receiving sensitivity of general CMOS image sensors, leading to inaccurate vital information acquisition, especially in varying lighting conditions.
Innovation Solution
A phosphor represented by the formula (Gd1-x-y,Lny,MII3)3MIII2(Ga1-z,MIVz)3O12:Cr3+ is used in a light emitting device to enhance near-infrared emission intensity, with a fluorescence peak between 750 nm and 900 nm, complementing the sensitivity of CMOS image sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light emitting device outputting only visible radiation is used, then the device structure is simple, but the accuracy of vital information acquisition deteriorates in dark places and under varying lighting conditions
Solution Approach 1:
The patent combines visible radiation emission and near-infrared radiation emission into a single light emitting device. The light emitting device includes a visible light emitting unit and a near-infrared light emitting unit that operate together to provide both visible and near-infrared light, enabling accurate vital information acquisition in dark places and under varying lighting conditions while maintaining relatively simple device structure
Solution Approach 2:
The light emitting device is designed to perform multiple functions by emitting both visible radiation and near-infrared radiation. This multi-functionality allows the device to adapt to different lighting conditions and measurement requirements, improving vital information accuracy across various environments without requiring separate specialized devices
2Measurement precision
If a light emitting device with high near-infrared emission intensity is used, then the compatibility with CMOS image sensors is improved, but the device complexity increases
Solution Approach 1:
The patent merges visible light emission and near-infrared light emission into a single integrated light emitting device. The visible light emitting unit and near-infrared light emitting unit are combined to provide comprehensive spectral coverage, improving compatibility with CMOS image sensors while avoiding the need for separate specialized devices
Solution Approach 2:
The patent utilizes phosphor materials with specific emission characteristics (fluorescence peak between 750-900 nm) to optimize near-infrared emission intensity. By selecting phosphors with appropriate emission parameters and combining them with LED excitation, the device achieves high near-infrared output without requiring complex multi-component systems
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 enhanced near-infrared emission intensity allows for high-quality image data acquisition even with low-sensitivity CMOS image sensors, improving vital information accuracy and adaptability to different lighting conditions.
Implementation Method 1
A phosphor represented by the formula (Gd1-x-y,Lnym,MII3)3MIII2(Ga1-z,MIVz)3O12:Cr3+ is used in a light emitting device to enhance near-infrared emission intensity, with a fluorescence peak between 750 nm and 900 nm
Data Source
AI summary
Provided is a phosphor represented by general formula (1) below,(Gd1-x-y,Lny,MIIx)3MIII2(Ga1-z,MIVz)3O12:Cr3+ (1)where, in the formula, Ln is one or more elements selected from La, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb, and Lu, MII is a divalent element, MIII is a trivalent element, MIV is a tetravalent element, and x, y, and z satisfy 0<x<0.5, 0≤y<0.5, and 0<z<0.5.