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Enhancing the Surface-State Emission in Trap-Rich CdS Nanocrystals by Silver Nanoparticles

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Abstract

It is well known that surface plasmon resonance (SPR) can selectively enhance the photoluminescence (PL) from nearby chromophores with a single emission peak at an appropriate distance. Here, we combine white light-emitting CdS quantum dot nanocrystals containing band-edge and surface-state emissions simultaneously with Ag nanoparticles and study the interaction between them. It is found that the surface-state emission is always enhanced while the band-edge emission quenched regardless of the SPR wavelength of Ag nanoparticles. This phenomenon reveals that the SPR of Ag nanoparticles is not enhancing the emission from a wavelength-matched state. We propose that the surface plasmon of Ag nanoparticles is first excited by the energy of the band-edge emission and then the excited energetic electrons transfer to the surface-state of CdS. Through this energy transfer process, the surface-state emission is enhanced and band-edge emission quenched. This investigation can not only deliver understanding of the complicated interaction between metallic nanoparticles and nearby multi-emission-peak contained chromophores, but it also has potential applications in tuning the color temperature of white light-emitting materials.

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Acknowledgments

The authors acknowledge the financial support from the Project of High-level Professionals in the Universities of Guangdong Province and the National Natural Science Foundation (Grant No. 61378082).

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Authors and Affiliations

  1. Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510006, People’s Republic of China

    Pei Xu, Qiang Li, Tao Li, Wenye Rao, Yuanzhao Wang, Sheng Lan & Lijun Wu

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  1. Pei Xu
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  2. Qiang Li
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  3. Tao Li
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Correspondence to Lijun Wu.

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Xu, P., Li, Q., Li, T. et al. Enhancing the Surface-State Emission in Trap-Rich CdS Nanocrystals by Silver Nanoparticles. Plasmonics 9, 1039–1047 (2014). https://doi.org/10.1007/s11468-014-9712-5

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  • DOI: https://doi.org/10.1007/s11468-014-9712-5

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