Used as a fluorescent dye in biological staining and imaging, particularly for detecting amyloid fibrils associated with neurodegenerative diseases like Alzheimer's. It binds selectively to beta-sheet structures in proteins, emitting strong fluorescence upon binding, making it valuable in diagnostic research and drug development. Also employed in optoelectronic applications due to its light-emitting properties, including in organic light-emitting diodes (OLEDs) and as a component in nonlinear optical materials. Its solvatochromic behavior allows use as a polarity probe in chemical and biochemical environments.