关键词: 四苯乙烯；聚集诱导发光；潜指纹显现；灰度值；指纹库

Abstract: Objective While ensuring high-contrast and high-sensitivity display of fingerprints, it realizes accurate identification and comparison of fingerprints and lays the foundation for applications in actual cases. Methods Using tetrastyrene as the matrix, the hydrophobicity of the tetrastyrene matrix was improved by introducing a hydrophobic base chain, and the probe FLA-1 was synthesized to realize the display of latent fingerprints on glass, aluminum plate and coin objects. Subsequently, using ImageJ software, semi-quantitative analysis of the obtained fingerprint imaging was performed to verify the ability of the fluorescent probe FLA-1 to enhance the visualization of latent fingerprints. In addition, through the matching study of the fingerprint recognition system, the sensitivity of the fluorescent probe FLA-1 to display latent fingerprints was objectively analyzed, and the recognition mechanism was studied through solid-state fluorescence testing. Results The grayscale measurement of ImageJ software showed that the grayscale values of ridges and small furrows changed significantly, and the visual contrast of fingerprints was significantly improved. In addition, we compared 24, 35, and 50 feature points on glass, coins and aluminum plates, which are enough to meet the requirements of fingerprint identification. Conclusion The designed and synthesized probe FLA-1 can be used to display latent fingerprints on the surface of different objects and realize fingerprint comparison, which is expected to be popularized in the field of criminal technology.

Key words: tetraphenyl ethylene; qggregation induced emission; the recognition of the latent fingerprints; the gray value; fingerprint database