Flexible Radiation Detector with Segmented Phosphor Layers
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Solution Overview
Problem
Conventional X-ray image detectors face a trade-off between high resolution and flexibility, with indirect conversion type detectors suffering from low resolution due to phosphor scattering and direct conversion type detectors being inflexible due to thick photoelectric conversion devices.
Innovation Solution
A flexible radiation detector design featuring a substrate with a switching device, an energy conversion layer, a top electrode layer, and double-layered phosphor layers, where the first phosphor layer near the energy conversion layer has a larger phosphor powder for high conversion efficiency and the second layer has a smaller powder to minimize scattering, enhancing both resolution and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phosphor dispersed in a resin is used in indirect conversion type detectors, then flexibility is improved, but X-ray image resolution deteriorates due to scattering
Solution Approach 1:
The phosphor layer is segmented into multiple layers with different phosphor particle sizes. The first phosphor layer contains larger particles for high conversion efficiency, while the second phosphor layer contains smaller particles to minimize scattering. This segmentation allows each layer to optimize for its specific function, resolving the contradiction between flexibility and resolution.
Solution Approach 2:
Different regions of the phosphor layer have different properties. The first phosphor layer near the energy conversion layer uses larger phosphor particles for high conversion efficiency, while the second phosphor layer uses smaller particles for minimal scattering. This local differentiation of properties allows simultaneous optimization of both conversion efficiency and image resolution.
2Measurement precision
If a thick amorphous selenium layer is used in direct conversion type detectors, then X-ray image resolution is improved, but flexibility deteriorates
Solution Approach 1:
The energy conversion function is segmented between the energy conversion layer (amorphous selenium) and the phosphor layers. The energy conversion layer can be kept thin for flexibility, while the phosphor layers provide the necessary conversion efficiency. This segmentation allows the system to achieve high resolution without requiring a thick amorphous selenium layer, thus maintaining flexibility.
3Use of energy by moving object
If a single phosphor layer with large phosphor powder is used, then X-ray conversion efficiency is improved, but scattering increases and resolution deteriorates
Solution Approach 1:
The phosphor layer is divided into two layers with different particle sizes. The first phosphor layer uses larger particles for high conversion efficiency, while the second phosphor layer uses smaller particles for minimal scattering. This segmentation allows the system to achieve both high conversion efficiency and high image resolution simultaneously.
Solution Approach 2:
The phosphor structure uses a composite arrangement of different particle sizes in different layers. This composite structure combines the advantages of large particles (high conversion efficiency) and small particles (minimal scattering), achieving both high energy conversion and high image resolution.
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 design achieves high-resolution X-ray imaging with improved flexibility by optimizing phosphor layer thickness and powder size to reduce scattering and enhance X-ray conversion efficiency while maintaining image quality.
Implementation Method 1
a first phosphor layer on the top electrode layer; and a second phosphor layer under the substrate
Implementation Method 2
a first phosphor layer on the top electrode layer; and a second phosphor layer under the substrate
Implementation Method 3
an energy conversion layer on the switching device
Data Source
AI summary
Disclosed is a flexible radiation detector including a substrate, a switching device on the substrate, an energy conversion layer on the switching device, a top electrode layer on the energy conversion layer, a first phosphor layer on the top electrode layer, and a second phosphor layer under the substrate.