Localized surface plasmon resonance enhanced photoluminescence of CdSe QDs in PMMA matrix on silver colloids with different shapes |
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| Authors: | Liu Lu Xiao-liang Xu Chao-shu Shi |
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| Affiliation: | a Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
b Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, People’s Republic of China |
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| Abstract: | Localized surface plasmon resonance (LSPR) enhanced photoluminescences (PL) from CdSe quantum dots (QDs) on worm-like or quasi-spherical silver colloids have been investigated. The shape of silver colloid film is controlled by annealing temperature (200 °C∼350 °C). Strong PL enhancements of CdSe QDs on both as-grown and annealed silver colloid films are observed. The results show that the PL enhancement factor of CdSe QDs on worm-like silver colloid film reaches as high as 15-fold. Moreover, the enhancement factor is 5 times larger than that obtained from the quasi-spherical silver colloids. The superiority of worm-like silver nanostructure on LSPR enhanced photoluminescence is attributed to its larger size, hot spots and multiple dipole resonance modes coupling, which are induced by aggregation effect. |
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| Keywords: | Enhanced photoluminescence Surface plasmon Silver colloids Worm-like Hot spots |
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