Upconversion spectroscopy and properties of NaYF4 doped with , and/or

Suyver, J.F.; Grimm, Judith; Veen, M.K. van; Biner, Daniel; Krämer, Karl; Güdel, Hans U.

doi:10.1016/j.jlumin.2005.03.011

Cited by 592 publications

(405 citation statements)

References 34 publications

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“…To this end, we implemented as UCNPs the commercially available particles of the hexagonal crystal phase of sodium yttrium fluoride (NaYF 4 ) doped with Yb 3+ and Er 3+ (β-NaYF 4 :Yb,Er). It is commonly accepted that the β-NaYF 4 matrix exhibits the highest UCL efficiency among the lanthanide-doped fluorides [37]. In particular, under excitation with NIR light, β-NaYF 4 :Yb,Er UCNPs reveal strong UCL emission bands in the green and red portions of the visible spectrum [38].…”

Section: Introductionmentioning

confidence: 99%

Multi-Functional Magnetic Photoluminescent Photocatalytic Polystyrene-Based Micro- and Nano-Fibers Obtained by Electrospinning

Schaer

Crittin

Kasmi

et al. 2014

Fibers

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This work reports on the implementation of electrospinning (ES) as a facile route to encapsulate nano-engineered materials in a polystyrene (PS) matrix. We applied ES to co-encapsulate two kinds of nanoparticles, i.e., upconversion nanophosphors (UCNPs) and superparamagnetic iron oxide nanoparticles (SPIONs), in polystyrene (PS)-based micro-and nano-fibers (PSFs). This approach made it possible to integrate near-infrared (NIR) light-sensitive 500-nm β-NaYF 4 :Yb, Er UCNPs with 10-nm γ-Fe 2 O 3 SPIONs in PS fibers. During the ES process, PSFs were additionally loaded with a well-established singlet oxygen ( 1 ∆ g ) photosensitizer, rose bengal (RB).The thus obtained PSFs revealed the promising features of prospective multi-functional magnetic photoluminescent photocatalytic nano-constructs. OPEN ACCESSFibers 2014, 2 76

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Section: Introductionmentioning

confidence: 99%

Multi-Functional Magnetic Photoluminescent Photocatalytic Polystyrene-Based Micro- and Nano-Fibers Obtained by Electrospinning

Schaer

Crittin

Kasmi

et al. 2014

Fibers

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“…In its most common embodiment, the infrared upconversion in lanthanide-doped nanoparticles is initiated by the absorption of 975 nm light by the sensitizer ion Yb 3+ , followed by energy transfer and ladder-climbing in the manifold of states in the activator ions [5,14,23,25,30], such as erbium Er 3+ , holmium (Ho 3+ ), and thulium (Tm 3+ ). In the material systems where the sensitizer and activator are different ions, the doping level of the sensitizing ion (Yb 3+ ) is high for two reasons: first, to capture the incoming radiation, and second, to increase the probability of energy transfer from the Yb 3+ ion to the activator ions.…”

Section: Selection Of Lanthanide Dopants and Associated Upconversion mentioning

confidence: 99%

“…The competing nonradiative relaxation (Scheme 1, (4)) can be reduced by incorporating the Ln 3+ ions into a nanoparticle to prevent interaction of the Ln 3+ ions with overtones of C-H and O-H stretching frequencies [19,20], provided that a low phonon energy host material is used [21][22][23]. With phonon energies of 350 cm −1 , 600 cm −1 , Journal of Nanotechnology and 880 cm −1 , respectively [22], lanthanum-fluoride (LaF 3 ), yttrium-oxide (Y 2 O 3 ), and yttrium-orthovanadate (YVO 4 ) crystal lattices have been used for upconversion, but the vast majority of the results come from the sodium-yttriumtetrafluoride (NaYF 4 ) host material with its low phonon energy of 370 cm −1 [23]. Recently energy clustering at sublattice level has been shown to enhance the efficiency of upconversion [6].…”

Section: Introductionmentioning

confidence: 99%

Visible Discrimination of Broadband Infrared Light by Dye-Enhanced Upconversion in Lanthanide-Doped Nanocrystals

Dupuy

Allen

Williams

et al. 2014

Journal of Nanotechnology

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Optical upconversion of near infrared light to visible light is an attractive way to capture the optical energy or optical information contained in low-energy photons that is otherwise lost to the human eye or to certain photodetectors and solar cells. Until the recent application of broadband absorbing optical antennas, upconversion efficiency in lanthanide-doped nanocrystals was limited by the weak, narrow atomic absorption of a handful of sensitizer elements. In this work, we extend the role of the optical antenna to provide false-color, visible discrimination between bands of infrared radiation. By pairing different optical antenna dyes to specific nanoparticle compositions, unique visible emission is associated with different bands of infrared excitation. In one material set, the peak emission was increased 10-fold, and the width of the spectral response was increased more than 10-fold.

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“…Tm 3þ is an excellent dopant candidate for upconversion under near-infrared or visible excitation because of its favorable intra-atomic 4f energy level structure. Its emission properties have been reported under $ 650 nm, 13,14 800 nm, 15,16 980 nm, [17][18][19] and 1064 nm 14,20 excitations.…”

Section: Introductionmentioning

confidence: 99%

Oxide phosphors for light upconversion; Yb3+ and Tm3+ co-doped Y2BaZnO5

Etchart

Hernández

Huignard

et al. 2011

Journal of Applied Physics

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The optical properties of Yb 3þ and Tm 3þ co-doped Y 2 BaZnO 5 , synthesized by solid-state reaction, are investigated in detail. Three main emission bands centered around 479 nm (blue), 654 nm (red), and 796 nm (near-infrared) are observed under near-infrared laser excitation via an upconversion process. Detailed studies of the upconversion properties as a function of dopant concentrations are described and upconversion efficiencies quantified precisely. Maximum efficiencies of $ 1.53% in the 730-870 nm near-infrared emission range and of $ 0.09% in the 420-530 nm blue range are obtained. The results of power dependence studies and concentration dependent lifetime measurements are presented. This in-depth spectroscopic study allows us, for the first time, to identify the dominant processes involved in the upconversion mechanism of Yb 3þ , Tm 3þ co-doped Y 2 BaZnO 5 oxides.

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Upconversion spectroscopy and properties of NaYF4 doped with , and/or

Cited by 592 publications

References 34 publications

Multi-Functional Magnetic Photoluminescent Photocatalytic Polystyrene-Based Micro- and Nano-Fibers Obtained by Electrospinning

Multi-Functional Magnetic Photoluminescent Photocatalytic Polystyrene-Based Micro- and Nano-Fibers Obtained by Electrospinning

Visible Discrimination of Broadband Infrared Light by Dye-Enhanced Upconversion in Lanthanide-Doped Nanocrystals

Oxide phosphors for light upconversion; Yb3+ and Tm3+ co-doped Y2BaZnO5

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