LexsygLuminescent detector|From UVTo X-ray

Research Background

High performance scintillation materials are important components in X-ray detection fields such as medical diagnosis and security imaging. Although traditional inorganic crystals have excellent performance, they have problems such as high cost and difficult processing. Recently, the San Carlos Institute of Physics in Brazil, in collaboration with a multinational team, conducted a study on "Fluorophosphate glasses doped with Eu ³"⁺And Dy ³⁺》A breakthrough has been made in the research, and a new type of fluorophosphate glass scintillator has been developed, which combines high density, long luminescence lifetime, and excellent X-ray response characteristics, opening up new directions for low-cost and customizable radiation detection.

Important discovery

Part 1 Material Design Innovation

The team successfully prepared 35NaPO using melt quenching technology₃-30Ba(PO₃)₂-25MgF₂-YF₃Base glass system, doped with Eu ³⁺(0.1-4.0 mol%) and Dy ³⁺(0.25-1.0 mol%) to achieve efficient luminescence. The fluorophosphate matrix combines the high rare earth solubility of phosphates with the low phonon energy of fluorides, significantly improving luminescence efficiency.

Part 2: Outstanding Performance Advantages

1) High density (3.65-3.66 g/cm ³):Beyond commercial uselithiumBorate glass (~2.50 g/cm ³), comparable to NaI: Tl crystal (3.67 g/cm ³), enhances X-ray absorption efficiency.

2) Ultra long luminous lifespan:Eu³⁺of⁵D₀State lifetime reaches 2.5ms，Dy³⁺of⁴F₉/₂State lifetime 0.71msSuperior to similar materials.

3) Zero concentration quenching:Eu³⁺Doping to 4.0 mol% still maintains linear luminescence enhancement (Figure 1), Dy³⁺Excellent stability within 1.0 mol%.

Figure 1. Eu ³ under different excitation powers⁺Emission spectra of doped glass

Part 3 X-ray Response Verification

passlexsygResearch spectrometer（Equipped with tungsten targetRadioluminescence (RL) tests using X-ray tubes and Newton CCD confirmed:

Eu³⁺glassAt 611 nm（⁵D₀→⁷F₂）A strong RL peak is observed at this location, with intensity increasing linearly with doping concentration (Figure 2), and effective suppression of 380 nm matrix defect luminescence (defect)Peak reduction30%).

Figure 2. Eu ³⁺X-ray photoluminescence (RL) spectra of doped glass

Dy³⁺glassDual peak emission (572 nm and 478 nm) is suitable for various photodetectors, and the RL intensity of the 1.0 mol% sample is 13% higher than that of the 0.25 mol% sample (Figure 3).

Figure 3. Dy ³⁺X-ray photoluminescence (RL) spectra of doped glass

Technical Highlights

The key data relied upon in this studylexsygHigh sensitivity RL testing system:
1) Accurate excitation:40 kV/1 mA continuous X-ray source, simulating real detection scenarios.
2) High signal-to-noise ratio detection:-80 ℃ cooled CCD combined with fiber optic spectrometer to capture weak luminescent signals.
3) Dynamic response analysis:Real time monitoring of the linear relationship between luminous intensity and power to verify material stability.

Application prospects

This glass system has demonstrated potential as a flexible X-ray sensor and wearable radiation dosimeter. The next step for the team is to optimize the rare earth ratio and explore the development of integrated devices coupled with optical fibers.