A stimuli-responsive and chemically tunable organic microcrystal laser switch.

Area of Science:

• Organic electronics
• Photonics
• Chemical sensing

Background:

• Stimuli-responsive materials offer tunable optical properties.
• Organic lasers provide a platform for compact and versatile photonic devices.
• Protonation-deprotonation reactions are fundamental chemical processes with potential for optical switching.

Purpose of the Study:

• To demonstrate a stimuli-responsive and chemically switchable organic microbelt laser.
• To investigate the use of reversible protonation-deprotonation reactions for laser tuning.
• To explore the potential of this system for sensing applications.

Main Methods:

• Fabrication of organic microbelt cavities.
• Utilizing H-aggregate transitions for lasing.
• Exposure to acid (HCl) and base (NH3) vapors to induce chemical switching.
• Characterization of lasing wavelength, intensity, and color changes.

Main Results:

• Achieved lasing at 585 nm in the parent microbelt.
• Demonstrated a reversible shift to 560 nm upon protonation with HCl vapor.
• Observed an intensity contrast ratio greater than 10^5 and a distinct color change from orange to green.
• Confirmed reproducible switching between 585 nm and 560 nm with good photostability.

Conclusions:

• Successfully developed a chemically switchable organic microbelt laser.
• The reversible protonation-deprotonation mechanism enables tunable laser operation.
• The system shows significant potential for high-throughput chemical and biological sensing due to its responsiveness and stability.