Europium-Activated Barium Fluorochloride Phosphor for X-Ray Detection

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Solution Overview

Problem

Existing X-ray inspection devices face challenges in achieving clear images due to insufficient visible light intensity, which is often attributed to low X-ray intensity or inefficient conversion of X-rays to visible light.

Innovation Solution

A fluorescent screen is developed with a phosphor layer containing europium-activated barium fluorochloride, optimized with a phosphor weight between 300 mg/cm² and 600 mg/cm², and a support body and protective layer with high total light transmittance, enhancing the conversion efficiency of X-rays to visible light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the intensity of X-rays applied to baggage is increased to increase visible light intensity, then the luminance of visible light increases, but the afterglow characteristics deteriorate

Engineering Contradiction:

Improvevisible light intensityVSAvoidafterglow characteristics

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the phosphor material by specifying exact ratios of Ba, F, Cl, and Eu (e.g., Ba:F:Cl:Eu = 100:95:5:0.5 to 100:90:10:0.5), thereby achieving high conversion efficiency while controlling afterglow characteristics through precise material formulation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite phosphor material combining barium fluorochloride with europium activation, creating a composite structure that simultaneously achieves high X-ray conversion efficiency and controlled afterglow properties through the synergistic interaction of different elements

Inventive Principle:

Principle #40Composite materials

2Productivity

If a phosphor with high conversion efficiency is used to increase visible light output, then clear images can be obtained, but the afterglow may increase

Engineering Contradiction:

Improveconversion efficiencyVSAvoidafterglow characteristics

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes the europium concentration within specific ranges (0.1-2.0 at%, preferably 0.3-1.0 at%) to achieve the balance between high conversion efficiency and acceptable afterglow characteristics through precise compositional control

Inventive Principle:

Principle #35Parameter changes

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 solution achieves a relative light output greater than 1.5 times that of conventional fluorescent screens, ensuring clearer images in X-ray inspection devices while maintaining acceptable afterglow characteristics.

Implementation Method 1

converting the detection X-rays to visible light by a phosphor

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentEP4563673A1X-ray fluorescent plate, x-ray detector, and x-ray inspection device using same

Publication Date: 2025.06.04 NITERRA MATERIALS CO LTD

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AI summary

Provided is a fluorescent screen configured to convert X-rays to visible light and including a first layer, a second layer and a third layer provided between the first layer and the second layer and containing a phosphor. The phosphor is formed of europium-activated barium fluorochloride. A weight of the phosphor is greater than or equal to 300 mg/cm2 and less than or equal to 600 mg/cm2. A total light transmittance of each of the first layer and the second layer for an emission wavelength 380 nm of the phosphor is greater than or equal to 70%.