Spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>Yb</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo>:</mml:mo><mml:msub><mml:mrow><mml:mtext>CaF</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: From isolated centers to clusters

Petit, Vincent; Camy, Patrice; Doualan, Jean‐Louis; Portier, X.; Moncorgé, R.

doi:10.1103/physrevb.78.085131

Cited by 117 publications

(67 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additionally, the higher sensitivity and the better spectral resolution of the fluorescence spectroscopy relative to that of the absorption allow to distinguish a doublet structure around the most intense line with two maxima peaking at 972.1 and 973.1 nm. In agreement with previously reported data obtained from other Yb 3þ -doped fluoride systems, 21 the spectrum in Fig. 2 22 The comparison of these emission spectra shows some differences at around 1010, 1040, and 1065 nm, which allow the assignment of the 2 F 5/2 (0 0 ) !…”

Section: Resultssupporting

confidence: 80%

Optical spectroscopy of Yb3+ centers in BaMgF4 ferroelectric crystal

García-Santizo

Rosal

Ramı́rez

et al. 2011

Journal of Applied Physics

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 80%

Optical spectroscopy of Yb3+ centers in BaMgF4 ferroelectric crystal

García-Santizo

Rosal

Ramı́rez

et al. 2011

Journal of Applied Physics

View full text Add to dashboard Cite

“…14 The excess impurity charge (11) of the Yb 31 cations is compensated primarily by embedding additional F 2 ions in the anion sublattice interstices. The 2 F 5/2 and 2 F 7/2 states of Yb 31 ions split into three and four Stark components in a tetragonal crystal field, respectively (Figure 2a).…”

Section: Optical Characteristics Of Cooperative Luminescencementioning

confidence: 99%

Multi-ion cooperative processes in Yb3+ clusters

et al. 2014

View full text Add to dashboard Cite

Cooperative luminescence (CL) occurs in spectral regions in which single ions do not have energy levels. It was first observed more than 40 years ago, and all results reported so far are from a pair of ions. In this work, upconverted CL of three Yb 31 ions was observed in the ultraviolet (UV) region under near-infrared (NIR) excitation. The UV CL intensity showed a cubic dependence on the NIR pump power, whereas the luminescence lifetime was nearly one-third the luminescence lifetime of single Yb 31 ions. The triplet CL (TCL) has a clear spectral structure, in which most emission peaks are consistent with the self-convoluted spectra from single Yb 31 ions. Blue shifts were observed for certain peaks, indicating complex interactions among the excited Yb 31 ions. The probability of the TCL process versus the average distances among three Yb 31 ions was derived via the first-and second-order corrections to the wave functions of lanthanide ions, indicating that the formation of Yb 31 clusters containing closely spaced ions favors the occurrence of the multi-ion interaction processes. Furthermore, the cooperative sensitization of one Gd 31 ion by four excited Yb 31 ions (Yb 31 -tetramer) was demonstrated experimentally, which exhibited a novel upconversion mechanism-cluster sensitization. Our results are intriguing for further exploring quantum transitions that simultaneously involve multiple ions. Keywords: cooperative luminescence; cooperative sensitization; quantum transition; ytterbium cluster INTRODUCTION Cooperative luminescence (CL) usually describes the processes by which a pair of ions emits one photon by simultaneous depopulation from their excited states. It represents a special type of electronic transitions occurring in spectral regions where the individual ions do not have absorption or emission. Experimental CL results are essential clues to understanding the nature of cooperative quantum transitions, such as the energy shifts of pair levels from their parent single-ion levels, the selection rules obeyed by the cooperative transitions, and quantum entanglement in multibody systems. [1][2][3] The first CL was demonstrated with a pair of excited Yb 31 ions in 1970. 4 Since then, the CL from Yb 31 -dimers has been studied extensively due to their unique 4f 13 configuration with two multiplets ( 2 F 5/2 , 2 F 7/2 ) and the relatively large absorption cross-section at ,980 nm. Various applications, such as scintillators, structural probes in solids and optical bistability, have been demonstrated with the CL from Yb 31 -dimers. [5][6][7][8][9][10][11] However, the relatively low emission cross-section impedes further experimental investigation of multi-ion cooperative processes.Nevertheless, CL is fundamentally fascinating from a purely theoretical perspective. More than 50 years ago, Dexter explained the cooperative processes based on first-order perturbation theory, 12 in which Coulomb coupling between two ions allows for their cooperative transition as a pair of ions. For processes involving three ions si...

show abstract

“…al. [9]. Considering all this results, the novelty of this spectroscopic study is related to the influence of Pb 2+ ions and Na + ions on the near IR emission properties of Yb 3+ ions doped in CaF 2 crystals.…”

Section: Resultsmentioning

confidence: 92%

“…Interesting results were obtained by using Yb 3+ : CaF 2 as amplifier pulses with durations of femtoseconds and energies of the milijoules [8]. When YbF 3 is dissolved in CaF 2 the Yb ions are in trivalent state, consequently additional charge-compensating defects appear in crystals [9]. The local compensation, by pairing of Yb 3+ ions with an interstitial / substitutional F -or Na + ions, creates various crystal field symmetries of the Yb 3+ ions which can influences de emission spectra of these ions.…”

Section: Introductionmentioning

confidence: 99%

Influence of some impurities on the emission properties of CaF2:YbF3 crystals

Stef

Nicoarǎ

Cirlan

et al. 2015

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Various concentrations of YbF3 -doped and NaF or PbF2 co-doped CaF2 crystals were grown using the conventional Bridgman method. Transparent colorless crystals were obtained in graphite crucible in vacuum using a shaped graphite furnace. The crystals have been cooled to room temperature using an established procedure. Room temperature absorption spectra have been obtained using a Shimadzu 1650PC spectrophotometer. Photoluminescent properties in IR spectral range were analyzed using a spectrofluorimeter Horiba Fluorolog 3. An IR laser diode at 932 nm was also used an directly injected in the equipment. The emission spectra are influenced by the concentration of co-dopant added to the melt, and the excitation wavelength. The high emission peak at 979 nm overlaps with the absorption peak. The highest intensity in the IR emission (around 1029 nm) is obtained for CaF2:0.72 mol% YbF3 crystal by excitation at 932 nm (diode lamp).

show abstract

Spectroscopy ofYb3+:CaF2: From isolated centers to clusters

Cited by 117 publications

References 40 publications

Optical spectroscopy of Yb3+ centers in BaMgF4 ferroelectric crystal

Optical spectroscopy of Yb3+ centers in BaMgF4 ferroelectric crystal

Multi-ion cooperative processes in Yb3+ clusters

Influence of some impurities on the emission properties of CaF2:YbF3 crystals

Contact Info

Product

Resources

About