An ionophore-based persistent luminescent 'Glow Sensor' for sodium detection.

Area of Science:

• Materials Science
• Analytical Chemistry
• Biomedical Engineering

Background:

• Optical sensors offer advantages like miniaturization and biocompatibility.
• Persistent luminescence (PL) offers improved signal-to-noise ratios over fluorescence by avoiding autofluorescence.
• PL is increasingly used for in vitro and in vivo biological monitoring.

Purpose of the Study:

• To develop a novel ion-selective optical sensor utilizing persistent luminescence.
• To create a phosphorescent sensor for ion detection with enhanced signal quality.

Main Methods:

• Combined strontium aluminate-based persistent luminescence microparticles with a non-fluorescent pH-responsive dye in a polymer membrane.
• Integrated ionophore-based optical sensor components.
• Developed a phosphorescent 'Glow Sensor' where luminescence is modulated by ion concentration.

Main Results:

• Demonstrated a functional ionophore-based optical bulk optode sensor using persistent luminescence microparticles.
• The 'Glow Sensor' showed luminescence intensity decreasing with increasing sodium concentration, indicating ion detection.
• Characterized sensor performance including lifetime, dynamic range, response time, reversibility, selectivity, and stability.

Conclusions:

• Successfully created the first ionophore-based optical bulk optode sensor utilizing persistent luminescence microparticles.
• The developed 'Glow Sensor' offers a promising alternative to traditional fluorescence-based sensors for ion detection.
• This technology has potential applications in biological monitoring with improved signal quality.