2011
DOI: 10.1088/0957-4484/22/32/325604
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Upconversion in NaYF4:Yb, Er nanoparticles amplified by metal nanostructures

Abstract: Upconversion (UC) fluorescence in NaYF4: Yb, Er nanoparticles amplified by metal nanostructures was compared in two nanostructure geometries: gold nanoshells surrounding nanoparticles and silver nanostructures adjacent to the nanoparticles, both placed on a dielectric silica surface. Enhanced UC luminescence signals and modified lifetimes induced by these two metals were observed in our study. The UC luminescence intensities of green and red emissions were enhanced by Ag nanostructures by a factor of approxima… Show more

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Cited by 77 publications
(81 citation statements)
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“…On the other hand, emission enhancement increases the radiative decay rate, thus shortening the luminescence decay time. 29 In our case, when Ag NPs are conjugated with AZO film, the green emission enhances 2.9 times and red emission by 3.2 times compared to only AZO film.…”
Section: Resultsmentioning
confidence: 56%
See 1 more Smart Citation
“…On the other hand, emission enhancement increases the radiative decay rate, thus shortening the luminescence decay time. 29 In our case, when Ag NPs are conjugated with AZO film, the green emission enhances 2.9 times and red emission by 3.2 times compared to only AZO film.…”
Section: Resultsmentioning
confidence: 56%
“…Such partial contribution of excitation and emission enhancement of green and red upconversion emission has also been reported. 29,32 IV. CONCLUSION In summary, we have deposited AZO film on quartz substrate in oxygen atmosphere with monophasic hexagonal structure of c-axis oriented nanorods upto 80 nm in height.…”
Section: Finite Difference Time Domain (Fdtd) Simulationmentioning
confidence: 99%
“…The influence of the conjugated Ag NPs on the ZnO:Er 3+ NPs was further realized by performing finite difference time domain (FDTD) simulation of the exact Ag NP (imported from TEM micrograph) in three dimensions which is well proven to solve Maxwell's electromagnetic equations for complex plasmonic geometries [24]. FDTD solutions (Version 8.7.1) [25] with appropriate simulations parameters and material response studied by Palik [26] with background index (1.33) was considered for the study.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, emission enhancement increases the radiative decay rate, reducing the luminescence decay time. 31 We have measured the luminescence decay under 375 nm excitation (Fig. 4) for Ag NPs conjugated with ZnO:Er 3+ nanoparticles; the decay characteristics remain similar with and without Ag NPs.…”
mentioning
confidence: 80%