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Wang Q.-R.,Liaocheng University | Wang Q.-R.,Shandong Provinical Key Laboratory of Optical Communication Science and Technology | Shi Q.,Liaocheng University | Shi Q.,Shandong Provinical Key Laboratory of Optical Communication Science and Technology | And 4 more authors.
Chinese Physics B | Year: 2015

We present a theoretical study of the influence of a single silver sphere on the fluorescence of radix angelica dahurica, which is a kind of traditional Chinese medicine. The enhancement factors of the excitation and the relaxation processes are deduced. The excitation can be enhanced more than 100 times at 315 nm. The enhancement factor of the emission can reach up to 9 at a center wavelength of 400 nm. © 2015 Chinese Physical Society and IOP Publishing Ltd. Source


Wang Q.,Liaocheng University | Wang Q.,Shandong Provinical Key Laboratory of Optical Communication Science and Technology | Shi Q.,Liaocheng University | Shi Q.,Shandong Provinical Key Laboratory of Optical Communication Science and Technology | And 6 more authors.
Journal of Luminescence | Year: 2016

The gold nanorods (AuNRs) were precipitated on Eu(dbm)3phen doped films by different spin rates. The plasmonic enhancement and quenching effects of gold nanorods on the fluorescence of Eu(dbm)3phen were both demonstrated. The enhancement on the fluorescence is sensitive to the distribution of the AuNRs. Both fluorescence enhancement mechanisms, i.e. increase of the intense absorption of ligands and increase of quantum efficiency, promote the 20 fold enhancement, at which the excitation wavelength red-shifts from 362 nm to 372 nm. Higher absorption of ligands in the complex due to the AuNRs caused the bathochromic shift of excitation peak. The quenching factor at 612 nm reached to 0.47. © 2016 Elsevier B.V. All rights reserved. Source


Wang Q.,LiaochengUniversity | Wang Q.,Shandong Provinical Key Laboratory of Optical Communication Science and Technology | Shi Q.,LiaochengUniversity | Shi Q.,Shandong Provinical Key Laboratory of Optical Communication Science and Technology | And 6 more authors.
Journal of Luminescence | Year: 2015

The luminescence properties of Eu(TTFA)3 complex in presence of silver nanoparticles were investigated at three excitation wavelengths of 350 nm, 383 nm and 463 nm, respectively. Luminescence quenching and enhancement were both observed at three different excitation and emission wavelengths. Luminescence at 612 nm, 578 nm, 590 nm and 650 nm were enhanced at excitation wavelength of 350 nm, and quenched at excitation wavelength of 383 nm. The enhancement factor reached to 1.6 and the quench factor was about 0.65. For 463 nm excitation, the luminescence at 612 nm was quenched, and the quench factor reached to 0.85. Luminescence at other three emission wavelengths (578 nm, 590 nm, and 650 nm) was enhanced, with the greatest enhancement factor of ~5. Source

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