A triphenylamine‐based aggregation‐induced emission active fluorescent probe for fluorescent ink, fingerprint powder, and visual detection of salmon freshness

Abstract Background Multifunctional fluorescent probes have attracted much attention due to their wide range of applications and high utilization. In this study, a multifunctional fluorescent probe (E)‐3‐(4‐(7‐(4‐(diphenylamino)phenyl)benzo[c] [1,2,5]thiadiazol‐4‐yl)phenyl)acrylic acid (TBAC) based on triphenylamine was designed and synthesized. Results The TBAC probe provided excellent aggregation‐induced emission (AIE) performance and could be used as a fluorescent ink for printing. It was also prepared successfully for application as a fingerprint powder, facilitating the visual detection of invisible fingerprints on surfaces such as glass, plastic, tinfoil, metal, aluminum, and resin. The probe exhibited a clear fluorescence response to 12 volatile amines via an AIE‐based ‘on–off’ mechanism in an EtOH/H 2 O (4/6, v/v) solution. The TBAC/bromocresol green (BCG) indicator label also enabled non‐destructive and rapid assessment of salmon freshness through dual‐channel colorimetric and fluorescence responses. Conclusion The versatility of TBAC makes it a promising material for various applications, including fluorescent materials, criminal detection, and food safety. This study provides a new basis for the multifunctional application of fluorescent probes. © 2025 Society of Chemical Industry.