Dynamic Reversible Full-Color Piezochromic Fluorogens Featuring Through-Space Charge-Transfer Thermally Activated...

Area of Science:

• Materials Science
• Organic Electronics
• Photophysics

Background:

• Thermally activated delayed fluorescence (TADF) materials offer high efficiency in organic light-emitting devices.
• Piezocromic luminescent (PCL) materials change emission color under mechanical pressure.
• Through-space charge transfer (TSCT) in donor-acceptor (D-A) systems is sensitive to structural changes.

Purpose of the Study:

• To develop dynamic, reversible full-color PCL materials.
• To explore the potential of TSCT-TADF emitters for piezocromism.
• To investigate the application of these materials in X-ray scintillator imaging.

Main Methods:

• Synthesis of novel TSCT-TADF emitters.
• Fabrication and characterization of single-crystal samples.
• Investigation of pressure-dependent luminescence properties.
• Measurement of photoluminescence quantum yield (PLQY).

Main Results:

• Demonstrated a full-color-gamut PCL process over a 170 nm range in single crystals.
• Achieved unity photoluminescence quantum yield for the TSCT-TADF-PCL emitters.
• Confirmed the dynamic and reversible nature of the piezocromic response.
• Showcased promising performance in X-ray scintillator imaging.

Conclusions:

• TSCT-TADF emitters provide a viable platform for developing advanced PCL materials.
• The demonstrated full-color PCL capability opens avenues for tunable optical sensors.
• These materials hold significant potential for next-generation X-ray imaging technologies.