A Zero-Thermal Quenching Flexible Fiber for Visible Cellular Concentration Detection.

Area of Science:

• Materials Science
• Optical Engineering
• Biomedical Sensing

Background:

• Current visible light sources for cellular analysis suffer from temperature-dependent signal drift and reduced accuracy.
• Existing spectrophotometric systems require improvement for stable and precise measurements in biological applications.

Purpose of the Study:

• To develop a novel yellow-emitting phosphor with enhanced thermal stability for visible light applications.
• To create a flexible optical detector for oxyhemoglobin concentration testing using the developed phosphor.
• To establish a design framework for lanthanide-doped materials with zero-thermal quenching properties.

Main Methods:

• Synthesis and characterization of Gd3ScGa4O12: Dy3+ phosphor.
• Investigation of trap-assisted thermoluminescence enhancement mechanisms for thermal stability.
• Fabrication of a flexible optical detector using the phosphor integrated into stretchable optical fiber.
• Evaluation of photoluminescence stability and measurement accuracy of the fabricated device.

Main Results:

• The Gd3ScGa4O12: Dy3+ phosphor exhibits zero-thermal quenching (ZTQ) up to 200°C.
• The flexible optical detector demonstrates excellent photoluminescence stability (near-zero chromaticity drift) and promising measurement accuracy (200 µg mL-1).
• Other doped Gd3ScGa4O12 materials (Tb3+, Eu3+, Pr3+) also show favorable thermal stability.

Conclusions:

• The developed Gd3ScGa4O12: Dy3+ phosphor provides a stable and precise visible light source.
• The flexible optical detector offers a reliable and reusable solution for oxyhemoglobin concentration testing.
• The study presents a ZTQ design framework applicable to other lanthanide-doped materials for advanced optical applications.