Giant photoluminescence enhancement in SiC nanocrystals by resonant semiconductor exciton-metal surface plasmon coupling

被引:16
作者
Dai, Dejian [1 ]
Dong, Zhenggao [1 ]
Fan, Jiyang [1 ]
机构
[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
NANOSTRUCTURES; SILVER;
D O I
10.1088/0957-4484/24/2/025201
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report giant fluorescence enhancement in SiC nanocrystals (NCs) embedded in a sodium dodecyl sulfonate dielectric medium by proximately contacted Ag nanoparticles. The enhancement in integrated fluorescence intensity reaches an astonishing 176-fold under 360 nm excitation (53.3-fold enhancement in emission maximum intensity). Finite-element simulation indicates that the strong resonant coupling between the excited SiC NCs and localized surface plasmons of the Ag nanoparticles plays a dominant role in determining fluorescence enhancement. In contrast, the absorption enhancement caused by light concentration around the Ag nanoparticles makes only a slight contribution to the overall enhancement. Our result opens the possibility of applications of these highly enhanced fluorescent SiC NCs in diverse areas such as sensing, optoelectronics and life sciences.
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页数:5
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