Excitation-wavelength-dependent photoluminescence of silicon nanoparticles enabled by adjustment of surface ligands
Xiao-Bin Shen‡a, Bin Song‡b, Bei Fang b, Ai-Rui Jiang b, Shun-Jun Ji *a （纪顺俊）and Yao He *b（何耀）
a Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
b Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC), Soochow University, Suzhou, Jiangsu 215123, China.
‡ These authors contribute equally.
Chem. Commun., 2018, 54, 4947--4950
We herein present pioneering studies to reveal that excitation-wavelength-dependent photoluminescence properties of fluorescent silicon nanoparticles (SiNPs) can be realized by rationally designing surface ligands,i.e., several kinds of oxidized indole derivatives. The resultant ligand-decorated SiNPs exhibit strong fluorescence, with significant excitation-wavelength-dependent emissive shifting from ∼420 nm to ∼550 nm. Taking advantage of their unique optical merits, we further exploit the resultant ligand-decorated SiNPs as novel fluorescent labels for anti-counterfeiting and cell imaging.