f–f oscillator strengths, hypersensitivity, branching ratios and quantum efficiencies discussed in the light of forgotten results

Auzel, F.

doi:10.1016/j.jallcom.2004.03.087

Cited by 25 publications

(5 citation statements)

References 29 publications

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“…This is the case for the Eu 3+ ion. systems with the same value for the  2 parameter do not necessarily show the same intensity for the hypersensitive transitions, because also the value of the refractive index n has to be taken in to account via the Lorentz local field correction (see equation 15): the higher the refractive index, the more intense the transitions become [737].…”

Section: Hypersensitivitymentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,346

108

1,912

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Section: Hypersensitivitymentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,346

108

1,912

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“…The Judd−Ofelt parametrization scheme works remarkably well for ions like Nd 3+ , Er 3+ , and Ho 3+ but is more difficult to apply for Pr 3+ . The fact that the Judd−Ofelt theory does not produce well the intensities of Pr 3+ spectra has been the subject of much debate. − A special case is Eu 3+ , where the τ R can be determined without knowledge of the intensity parameters using the Einstein coefficient for spontaneous emission A of the magnetic dipole transition 5 D 0 → 7 F 1 , the refractive index n , and the ratio of the total integrated intensity to the integrated intensity of the 5 D 0 → 7 F 1 transition …”

Section: Luminescence Of Lanthanide Complexesmentioning

confidence: 99%

“…The fact that the Judd-Ofelt theory does not produce well the intensities of Pr 3+ spectra has been the subject of much debate. [75][76][77][78] A special case is Eu 3+ , where the τ R can be determined without knowledge of the intensity parameters using the Einstein coefficient for spontaneous emission A of the magnetic dipole transition 5 D 0 f 7 F 1 , the refractive index n, and the ratio of the total integrated intensity to the integrated intensity of the 5 D 0 f 7 F 1 transition. 70 The overall quantum yield, Φ tot , can be experimentally measured, but the determination of reliable values is not an easy task.…”

Section: Principles Of Lanthanide Luminescencementioning

confidence: 99%

Lanthanide-Based Luminescent Hybrid Materials

2009

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Koen Binnemans was born in Geel, Belgium, in 1970. He obtained his M. Sc. degree (1992) and Ph.D. degree (1996) in Chemistry at the Catholic University of Leuven, under the supervision of Prof. C. Go ¨rller-Walrand. In the period 1999-2005, he was a postdoctoral fellow of the Fund for Scientific Research Flanders (Belgium). He did postdoctoral work with Prof. Jacques Lucas (Rennes, France) and Prof. Duncan W. Bruce (Exeter, U.K.). In 2000, he received the first ERES Junior Award (ERES, European Rare-Earth and Actinide Society). From 2002 until 2005, he was (parttime) associate professor. Presently, he is professor of chemistry at the Catholic University of Leuven. His current research interests are metalcontaining liquid crystals (metallomesogens), lanthanide-mediated organic reactions, lanthanide spectroscopy, luminescent molecular materials, and ionic liquids.

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“…Similar to metallic nanoparticles, melting point depression and superheating of nanocrystals might also be expected [30]. It is well known that the upconversion (UPC) process or APTE (standing for 'addition de photon par transferts d'energie') described by Auzel in [31] may obey the Stokes rule and take place between two adjacent ions, both of them being in excited states [32]. Erbium was the first lanthanide ion, where the ETU was observed [33].…”

Section: Introductionmentioning

confidence: 99%

Giant enhancement of upconversion in ultra-small Er³⁺/Yb³⁺:NaYF₄nanoparticles via laser annealing

Bednarkiewicz

Wawrzyńczyk

Gągor³

et al. 2012

Nanotechnology

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Most of the synthesis routes of lanthanide-doped phosphors involve thermal processing which results in nanocrystallite growth, stabilization of the crystal structure and augmentation of luminescence intensity. It is of great interest to be able to transform the sample in a spatially localized manner, which may lead to many applications like 2D and 3D data storage, anti-counterfeiting protection, novel design bio-sensors and, potentially, to fabrication of metamaterials, 3D photonic crystals or plasmonic devices. Here we demonstrate irreversible spatially confined infrared-laser-induced annealing (LIA) achieved in a thin layer of dried colloidal solution of ultra-small ∼8 nm NaYF4 nanocrystals (NCs) co-doped with 2% Er3+ and 20% Yb3+ ions under a localized tightly focused beam from a continuous wave 976 nm medium power laser diode excitation. The LIA results from self-heating due to non-radiative relaxation accompanying the NIR laser energy upconversion in lanthanide ions. We notice that localized LIA appears at optical power densities as low as 15.5 kW cm−2 (∼354 ± 29 mW) threshold in spots of 54 ± 3 µm diameter obtained with a 10 × microscope objective. In the course of detailed studies, a complete recrystallization to different phases and giant 2–3 order enhancement in luminescence yield is found. Our results are highly encouraging and let us conclude that the upconverting ultra-small lanthanide-doped nanophosphors are particularly promising for direct laser writing applications.

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f–f oscillator strengths, hypersensitivity, branching ratios and quantum efficiencies discussed in the light of forgotten results

Cited by 25 publications

References 29 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Lanthanide-Based Luminescent Hybrid Materials

Giant enhancement of upconversion in ultra-small Er³⁺/Yb³⁺:NaYF₄nanoparticles via laser annealing

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f–f oscillator strengths, hypersensitivity, branching ratios and quantum efficiencies discussed in the light of forgotten results

Cited by 25 publications

References 29 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Lanthanide-Based Luminescent Hybrid Materials

Giant enhancement of upconversion in ultra-small Er3+/Yb3+:NaYF4nanoparticles via laser annealing

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Product

Resources

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Giant enhancement of upconversion in ultra-small Er³⁺/Yb³⁺:NaYF₄nanoparticles via laser annealing