A new silver cluster that emits bright-blue phosphorescence

Area of Science:

• Materials Science
• Inorganic Chemistry
• Photophysics

Background:

• Luminescent materials are crucial for advanced optical applications.
• Developing stimuli-responsive luminescent compounds remains a key research area.
• Silver clusters offer unique photophysical properties.

Purpose of the Study:

• To synthesize and characterize a novel hexanuclear silver(i) cluster (NC-Ag6).
• To investigate the luminescent properties of NC-Ag6, including its phosphorescence and mechanoresponsiveness.
• To explore the application of NC-Ag6 in composite materials for tunable emission.

Main Methods:

• Synthesis of the hexanuclear silver(i) cluster (NC-Ag6).
• Photoluminescence spectroscopy to analyze emission color, quantum yield (QY), and lifetime.
• Fabrication and characterization of composite films with YAG:Ce3+ phosphors.
• Investigation of mechanoresponsive luminescence properties.

Main Results:

• A new hexanuclear silver(i) cluster (NC-Ag6) was successfully synthesized.
• NC-Ag6 exhibits bright-blue phosphorescence with a QY of 22% and a lifetime of 22.4 μs.
• Composite films demonstrated "chameleon"-like emission, including white light, via excitation-dependent Förster resonance energy transfer (FRET).
• The luminescence color of NC-Ag6 is mechanoresponsive, shifting from blue to green with negligible QY loss.

Conclusions:

• The synthesized NC-Ag6 is a promising blue-emitting phosphorescent material.
• The composite material shows tunable emission properties, including white light generation.
• The mechanoresponsive nature of NC-Ag6 opens possibilities for novel sensor and display applications.