The enhanced two-photon-excited fluorescence of CdSe quantum dots on the surface of au island films from surface Plasmon resonance

• Published in: Thin solid films 2012-10, Vol.521, p.112-114
• Main Authors: Yi, Jie, Han, Xueting, Chen, Xuanlin, Liu, Chunxia, An, Wenyu, Dong, Xue, Liu, Menglin, An, Limin, Luo, Yingmin
• Format: Article
• Language: English
• Subjects: Au island thin film (AIF); Cadmium selenides; CdSe; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Decay rate; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Fluorescence; Fluorescence enhancement; Growth from solutions; Intermetallics; Islands; Materials science; Methods of crystal growth; physics of crystal growth; Nanoscale materials and structures: fabrication and characterization; Other topics in nanoscale materials and structures; Physics; Plasmons; Quantum dots; Quantum dots (QDs); Surface and interface electron states; Surface plasmon resonance (SPR); Thin films; Two-photon-excited fluorescence
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2012.02.041

CdSe quantum dots (QDs) are synthesized in an aqueous solution. A significant enhancement in fluorescence intensity is observed from the CdSe QDs on the Au island thin film (AIF) as compared to that on glass excited by 800nm femto second laser. On the other hand, the fluorescence intensity decay of CdSe QDs on AIF shows a faster decay decrease in average fluorescence lifetime. Fluorescence spectroscopy, transmission electron microscope, atomic force microscope and fluorescence decay are employed to analyze fluorescence enhancement of CdSe QDs. The spectrum change of the CdSe QDs on AIF is dependent on surface plasmon resonance. The enhanced two-photon-excited fluorescence of CdSe QDs on the surface of AIF could be utilized in a variety of chemical and biological detection from a practical point of view.