Bright Long-Lived Luminescence of Silicon Nanocrystals Sensitized by Two-Photon Absorbing Antenna

被引：23

作者：

Ravotto, Luca ^{[1
]}

Chen, Qi ^{[2
]}

Ma, Yuguo ^{[2
]}

Vinogradov, Sergei A. ^{[3
,4
]}

Locritani, Mirko ^{[1
]}

Bergamini, Giacomo ^{[1
]}

Negri, Fabrizia ^{[1
]}

Yu, Yixuan ^{[5
,6
]}

Korgel, Brian A. ^{[5
,6
]}

Ceroni, Paola ^{[1
]}

机构：

[1] Univ Bologna, Dept Chem Giacomo Ciamician, Via Selmi 2, I-40126 Bologna, Italy

[2] Peking Univ, Coll Chem, Ctr Soft Matter Sci & Engn, Minist Educ,Key Lab Polymer Chem & Phys, Beijing 100871, Peoples R China

[3] Univ Penn, Dept Biochem & Biophys, Philadelphia, PA 19104 USA

[4] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA

[5] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

[6] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

来源：

CHEM | 2017年 / 2卷 / 04期

基金：

美国国家科学基金会;

关键词：

ABSORPTION CROSS-SECTIONS; QUANTUM DOTS; OPTICAL-PROPERTIES; NANOPARTICLES; FLUORESCENCE; PHOTOLUMINESCENCE; CYTOTOXICITY; EXCITATION; PASSIVATION; DENDRIMERS;

D O I：

10.1016/j.chempr.2017.02.007

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Silicon nanocrystals with an average diameter of 5 nm and functionalized with 4,7-di(2-thienyl)-2,1,3-benzothiadiazole chromophores (TBT) and dodecyl chains exhibit near-infrared emission upon one-photon (1P) excitation at 515 nm and two-photon (2P) excitation at 960 nm. By using TBT chromophores as an antenna, we were able to enhance both 1P and 2P absorption cross-sections of the silicon nanocrystals to more efficiently excite their long-lived luminescence. These results chart a path to 2P-excitable imaging probes with long-lived oxygen-independent luminescence, a rare combination of properties that should allow for a substantial increase in imaging contrast.

引用

页码：550 / 560

页数：11

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