Radiation Detector Organic Semiconductor Light Loss
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Solution Overview
Problem
Current radiation detectors face inefficiencies in detection due to light loss caused by reflections at the interface between different materials, particularly between the scintillator layer and the conductive layers, which affects the overall detection efficiency.
Innovation Solution
Incorporating an organic member with an organic semiconductor layer and a light-transmissive first conductive layer, where a portion of the organic member is placed between the conductive regions, reducing light loss by minimizing refractive index differences and using a base body with organic materials to enhance light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional conductive layer is placed between the scintillator layer and the organic member, then electrical conductivity is improved, but light loss increases due to reflections at the interface between materials with different refractive indices
Solution Approach 1:
The patent introduces a light-transmissive conductive layer as an intermediary component between the scintillator layer and the organic member. This layer serves dual functions: maintaining electrical conductivity while minimizing light loss by reducing refractive index differences at interfaces. The conductive layer acts as a mediator that reconciles the conflicting requirements of electrical functionality and optical transmission.
Solution Approach 2:
The patent changes the optical parameters of the conductive layer by selecting materials with refractive indices that gradually transition between the scintillator layer and the organic member. This parameter optimization reduces reflection losses at interfaces while maintaining the electrical conductivity required for detector operation.
2Loss of energy
If the refractive index difference between adjacent layers is reduced to minimize reflections, then light transmission is improved, but material selection and device complexity increase
Solution Approach 1:
The patent optimizes the refractive index parameter of the conductive layer to fall within a specific range (1.3-1.7) that balances light transmission and electrical conductivity. By defining this parameter range, the patent simplifies material selection while achieving reduced reflections without requiring overly complex multi-layer structures.
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
This configuration increases the detection efficiency of radiation detectors by reducing light loss and improving the sensitivity for beta rays while maintaining selectivity against other types of radiation.
Implementation Method 1
a first member (10) including a scintillator layer (11)
Implementation Method 2
an organic member (30) including an organic semiconductor layer (31)
Data Source
AI summary
According to one embodiment, a radiation detector includes a first member including a scintillator layer, an organic member including an organic semiconductor layer, and a first conductive layer. The first conductive layer includes a first conductive region and a second conductive region. A second direction from the first conductive region toward the second conductive region crosses a first direction from the organic member toward the first member. A first portion of the organic member is between the first conductive region and the second conductive region in the second direction.