Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium

Page, Ralph H.; Schaffers, Kathleen I.; Waide, P. A.; Tassano, J.B.; Payne, Stephen A.; Krupke, William F.; Bischel, William K.

doi:10.1364/josab.15.000996

Cited by 293 publications

(207 citation statements)

References 27 publications

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“…At sufficiently high intensity excitation, the power dependence of the emission should saturate since the sensitizer population should reach a steady state at high light flux, and maximum emission quantum yields would be observed under such conditions. Although high upconversion efficiencies have been reported in one case for a solid Ln III -doped material [ measure quantum yields for the green emission from the upconversion material NaYF 4 : Yb/Er (20/2%) and reported a value of 3 per cent for such powders using a power density of 20 W cm −2 , which is consistent with earlier studies by Page et al [102]. Quantum yields for a colloidal suspension of core:shell UCNPs (approx.…”

Section: Uncaging Using Upconversion Nanoparticles (A) Introduction Tsupporting

confidence: 90%

Multi-photon excitation in uncaging the small molecule bioregulator nitric oxide

Garcia

Zhang

Ford

2013

Phil. Trans. R. Soc. A.

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Multi-photon excitation allows one to use tissue transmitting near-infrared (NIR) light to access excited states with energies corresponding to single-photon excitation in the visible or ultraviolet wavelength ranges. Here, we present an overview of the application of both simultaneous and sequential multi-photon excitation in studies directed towards the photochemical delivery (‘uncaging’) of bioactive small molecules such as nitric oxide (NO) to physiological targets. Particular focus will be directed towards the use of dyes with high two-photon absorption cross sections and lanthanide ion-doped upconverting nanoparticles as sensitizers to facilitate the uncaging of NO using NIR excitation.

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Section: Uncaging Using Upconversion Nanoparticles (A) Introduction Tsupporting

confidence: 90%

Multi-photon excitation in uncaging the small molecule bioregulator nitric oxide

Garcia

Zhang

Ford

2013

Phil. Trans. R. Soc. A.

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“…We have followed Page et al 44 and assumed the two quantum systems in fast equilibrium, with an equilibrium decay rate eq ⌫ 10 T common for the two levels ͉1͘ and the population relationship expressed by the fourth equality. There, x Z m is the partition function for the level m of x and ⌬E ͑=0 in this paper͒ is the energy gap between the first excited level of y and x.…”

Section: Upconversion: Nretmentioning

confidence: 99%

Influence of metallic nanoparticles on upconversion processes

Esteban

Laroche

Greffet

2009

Journal of Applied Physics

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Influence of surface oxidation on plasmon resonance in monolayer of gold and silver nanoparticles J. Appl. Phys. 112, 103531 (2012) It is well known that Raman scattering and fluorescence can be enhanced by the presence of metallic nanoparticles. Here, we derive simple equations to analyze the influence of metallic nanoparticles on upconversion processes such as nonradiative energy transfer or excited state absorption. We compare the resulting expressions with the more familiar Raman and fluorescence cases and find significant differences. We use numerical simulations to calculate the upconverted signal enhancement achievable by means of metallic spheres of different radii and find particles of 100-400 nm radius at infrared frequencies to be favorable. We also discuss the considerable challenges involved in using metallic particles to enhance upconversion for solar energy.

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“…However, to the best of our knowledge, under continuous wave excitation, the highest power upconversion efficiency, defined as the output power of higherenergy photons divided by the input power of stimulating photons, is 12.7% (8.3% quantum yield) 14 . Intensive efforts are currently being made to synthesize upconversion materials with increasing power upconversion efficiencies 2,7,[14][15][16][17][18][19] . In addition, there have been two recent studies with pulsed laser sources employed for excitation 20,21 , where the excitation power densities in each pulse are much higher than the corresponding timeaveraged excitation power densities.…”

mentioning

confidence: 99%

“…The reported upconversion quantum yields are 16.2 and 16% and the corresponding power upconversion efficiencies are B25 and 19%. A major factor limiting the efficiencies of energy transfer upconversion materials is multiphonon relaxation 22,23 , through which the excited electron energy dissipates to the crystal lattice as heat 17 . A process that can bypass or even benefit from multiphonon relaxation can potentially break the upconversion efficiency limit and hit higher efficiencies.…”

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confidence: 99%

Photon energy upconversion through thermal radiation with the power efficiency reaching 16%

et al. 2014

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The efficiency of many solar energy conversion technologies is limited by their poor response to low-energy solar photons. One way for overcoming this limitation is to develop materials and methods that can efficiently convert low-energy photons into high-energy ones. Here we show that thermal radiation is an attractive route for photon energy upconversion, with efficiencies higher than those of state-of-the-art energy transfer upconversion under continuous wave laser excitation. A maximal power upconversion efficiency of 16% is achieved on Yb 3 þ -doped ZrO 2 . By examining various oxide samples doped with lanthanide or transition metal ions, we draw guidelines that materials with high melting points, low thermal conductivities and strong absorption to infrared light deliver high upconversion efficiencies. The feasibility of our upconversion approach is further demonstrated under concentrated sunlight excitation and continuous wave 976-nm laser excitation, where the upconverted white light is absorbed by Si solar cells to generate electricity and drive optical and electrical devices.

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Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium

Cited by 293 publications

References 27 publications

Multi-photon excitation in uncaging the small molecule bioregulator nitric oxide

Multi-photon excitation in uncaging the small molecule bioregulator nitric oxide

Influence of metallic nanoparticles on upconversion processes

Photon energy upconversion through thermal radiation with the power efficiency reaching 16%

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