Solvent polarity-induced photoluminescence enhancement (SPIPE): A method enables several-fold increase in quantum yield of silicon nanoparticles  

作　　者：Xiao-Bin Shen Bin Song Bei Fang Xiao Yuan You-Yong Li Shun-Yi Wang Shun-Jun Ji Yao He 

机构地区：[1]Laboratory of Nanoscale Biochemical Analysis, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC), Soochow University, Suzhou 215123, China [2]Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

出　　处：《Nano Research》2019年第2期315-322,共8页纳米研究（英文版）

基　　金：the National Basic Research Program of China (973 Program)(Nos. 2013CB934400 and 2012CB932400);the National Natural Science Foundation of China (NSFC)(Nos. 21672157, 21542015, 21372174, 61361160412, and 31400860);the Ph.D. Programs Foundation of Ministry of Education of China (No. 20133201130004);the Project of Scientific and Technologic Infrastructure of Suzhou (No. SZS201708);Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC).

摘　　要：Fluorescent silicon nanoparticles (SiNPs) bring exciting opportunities for long-awaited silicon-based optical application, while intrinsic indirect band gap of silicon severely limits photoluminescent quantum yield (PLQY) of SiNPs. To address this critical issue, we herein demonstrate a facile and general method, Le., solvent polarity-induced photoluminescence enhancement (SPIPE)1 yielding several-fold increase in quantum yield (QY) of SiNPs. Typically, different kinds of 4-substituented-1,8-naphthalic anhydride molecules, Le., 4-Br-1,8-naphthalic anhydride (BNA)1 4-triphenylamino-1,8-naphthalic anhydride (TPNA)1 and 4-dimethylamino-1,8-naphthalic anhydride (DMNA)1 are rationally designed and synthesized, which serve as surface ligands for the production of BNA-, TPNA-, and DMNA-capped small-sized (diameter:- 3.8-5.8 nm) SiNPs with QY of^8%,~15%,~16%, respectively. Of particular significance, QY of the resultant SiNPs could be greatly enhanced from^10% to^50% through the SPlPE strategy. Taken together with the theoretical calculation and the results of time-correlated single photon counting, we reveal that actived excited-state charge transfer interactions between surface-covered ligand and silicon oxide coating would be responsible for the observed QY enhancement. Moreover, other five kinds of solvents (i.e., methanol, isopropanol, dimethyl sulfoxide, N,N-dimethylformamide, and acetonitrile) are further employed for the SiNPs treatment, and similar improvement of QY values are observed, convincingly demonstrating the universal evidence of SPIPE of the SiNPs.

关 键 词：silicon nanoparticles quantum yield FLUORESCENT surface LIGAND SOLVENT polarity 

分 类 号：O4[理学—物理]