Hypersensitive pseudoquadrupole transitions in lanthanides

Jørgensen, Chr. Klixbüll; Judd, B. R.

doi:10.1080/00268976400100321

Cited by 874 publications

(230 citation statements)

References 18 publications

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“…Jørgensen and Judd suggested that inhomogeneities in the dielectric surrounding the lanthanide ion could enhance the intensity of a hypersensitive transition [263]. According to this theoretical model, the electric field induces oscillating dipole moments in the ligands, which become secondary sources of radiation.…”

Section: Hypersensitivitymentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,364

108

1,912

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Section: Hypersensitivitymentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,364

108

1,912

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“…Such transitions are termed as hypersensitive transitions by Jorgensen and Judd [23]. These transitions are found to obey the selection rule ∆J≤2, ∆L≤2 and ∆S=0 [23].…”

Section: According To Judd-ofelt Theory [20 21] the Oscillator Strenmentioning

confidence: 99%

“…Such transitions are termed as hypersensitive transitions by Jorgensen and Judd [23]. These transitions are found to obey the selection rule ∆J≤2, ∆L≤2 and ∆S=0 [23]. These transitions are associated with a very large value of the reduced matrix element U 2 2 ; hence hypersensitivity is much related with the Ω 2 parameter.…”

Section: According To Judd-ofelt Theory [20 21] the Oscillator Strenmentioning

confidence: 99%

Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses

Mohan¹,

Thind²,

Sharma³

2007

Braz. J. Phys.

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The effect of increasing the rare earth ion concentration on the physical and spectroscopic properties of Nd 3+ doped sodium-lead-borate glasses have been studied for the compositions (10-x) Na 2 O-30PbO-60B 2 O 3 -xNd 2 O 3 , where x = 1.00, 1.25, 1.50, 1.75 and 2.00 mol %. Optical band gaps, cut-off wavelengths and various spectroscopic parameters (E 1 , E 2 , E 3 , F 2 , F 4 , F 6 and ξ 4 f ) have been determined from the room temperature absorption spectra. Judd-Ofelt theory has been employed to determine the intensity parameters Ω 2 , Ω 4 and Ω 6 which in turn are used to evaluate radiative transition probability (A), branching ratio (β) and radiative lifetime (τ R ) for the fluorescent level 4 F 3/2 . The Ω 2 parameter and hence the non-symmetric component of electric field acting on Nd 3+ ion is found to be highest for glass with 1.75 mol% of Nd 2 O 3 . Because of the poor resolution of hypersensitive transition, the covalency of the Nd-O bond has been characterized by the relative intensity of 4 I 9/2 → 4 F 7/2 , 4 S 3/2 . The highest covalency has been predicted for glass with 2 mol% Nd 2 O 3 . The radiative properties are found to improve with an increase in concentration of Nd 2 O 3 for the present study.

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“…Since the upconversion emissions of Er 3+ ions are hypersensitive to the surroundings in comparison to Tm 3+ optical transitions ( Figure S2, Supporting Information). [ 23 ] Both the Er 3+ green and red upconversion emissions (including the line shape and position) are distinctively different in glassy and crystalline matrix ( Figure S2, Supporting Information). This spectroscopic feature is in particular useful to distinguish the Er 3+ ions in the nanocrystalline lattice from those diffused into the amorphous glass matrix, since the Er 3+ ions in the glassy environment show an absence of fi ne-structure spectroscopic features, which are observed for Er 3+ ions in the crystalline host.…”

Section: Resultsmentioning

confidence: 99%

“…[ 10b,34 ] By contrast, Er 3+ ions coordinated in crystalline sites in the NCs suspension give rise to upconversion spectra with a distinct fi ne structure. Although the Stark splitting of Er 3+ optical transitions occurs in both glass matrix and crystalline lattice, the Stark splitting of the continuum of different Er 3+ coordination sites in the glass matrix smears to broad bands, [ 23 ] whereas the similarity of Stark splitting of Er 3+ ions in crystalline sites results in narrow and distinct emissions. Consequently, the existence of the same fi ne-structure upconversion spectra between NCs-doped TZN glasses and LiYF 4 :Yb,Er NCs suspension demonstrates the survival of doped NCs in the TZN glass melt (Figure 3 a-c, and Figure S9, Supporting Information, different amounts of NCs in TZN glass).…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Upconversion Nanocrystal‐Doped Glass: A New Paradigm for Photonic Materials

Zhao

Zheng

Schartner

et al. 2016

Advanced Optical Materials

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The integration of novel luminescent nanomaterials into glassy matrix can lead to new hybrid materials and photonic devices with promising material performance and device functions. Lanthanide‐containing upconversion nanocrystals have become unique candidates for sensing, bioimaging, photon energy management, volumetric displays, and other photonic applications. Here, a versatile direct‐doping approach is developed to integrate bright upconversion nanocrystals in tellurite glass with tailored nanoscale properties. Following our two‐temperature glass‐melting technique, the doping temperature window of 550–625 °C and a 5 min dwell time at 577 °C are determined as the key to success, which balances the survival and dispersion of upconversion nanocrystals in glass. It is identified that the fine spectra of upconversion emissions can be used to diagnose the survival and dissolution fraction of doped nanocrystals in the glass. Moreover, 3D dispersion of nanocrystals in the glass is visualized by upconversion scanning confocal microscopy. It is further demonstrated that a low‐loss fiber, drawn from the highly transparent nanocrystals‐doped glass retains the distinct optical properties of upconversion nanocrystals. These results suggest a robust strategy for fabrication of high‐quality upconversion nanocrystal‐doped glasses. The new class of hybrid glasses allows for fiber‐based devices to be developed for photonic applications or as a useful tool for tailoring light–nanoparticles interactions study.

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Hypersensitive pseudoquadrupole transitions in lanthanides

Cited by 874 publications

References 18 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses

Upconversion Nanocrystal‐Doped Glass: A New Paradigm for Photonic Materials

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