Why so deep research on Yb3+-doped optical inorganic materials?

Boulon, G.

doi:10.1016/j.jallcom.2007.04.148

Cited by 192 publications

(110 citation statements)

References 52 publications

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“…The zero-line transition associated with the radiative de-excitation between the lowest excited level and the ground state (transition 5!1) can be used as a local probe to count the number of sites occupied by the ytterbium ions. [6] For instance, a cubic-to-tetragonal phase transition was evidenced in Yb-doped BaTiO 3 . [7] Due to the small separation between Stark levels, a small increase in the temperature results in the population of the upper energy levels.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

et al. 2011

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Synthesized powders and grown single crystals of nominal compositions Li(6)Ln(BO(3))(3):Yb(3+) (Ln=Y, Gd) were investigated by means of powder and single-crystal X-ray diffraction (XRD), as well as optical near-IR spectroscopy in conjunction with electron paramagnetic resonance (EPR) spectroscopy. The appearance of two distinct zero-phonon lines suggests the existence of two kinds of Yb(3+) ions in the single crystals. The XRD results exclude the possibility of a phase transition occurring between room and low temperatures. EPR spectra of single crystals show the presence of both isolated ions and pairs of ytterbium ions substituted for Y(3+). A strong temperature dependence of the intensity of Yb-Yb pairs resonance lines coincides with temperature dependence of emission peak at 978 nm, confirming a common origin of the defect giving rise to these spectra. Calculated from EPR spectra, the distance between pairs of Yb(3+) is in good agreement with crystallographic ones: R=3.856 Å, R(cryst) =3.849 Å.

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Section: Introductionmentioning

confidence: 99%

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

et al. 2011

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“…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.…”

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confidence: 99%

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confidence: 99%

Multi-ion cooperative processes in Yb3+ clusters

et al. 2014

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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...

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“…1), 2) In particular, development of appropriate phosphor particles for white light emitting diode (WLED) is also a very important issue. Furthermore, low energy and high yield synthesis method of the phosphor materials for LED devices have been intensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ce3+-doped Y3Al5O12 phosphor particles by precipitation method with diamine molecules as precipitating agent

Uekawa

Hokama

Wen

et al. 2014

J. Ceram. Soc. Japan

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An aqueous solution of aluminum nitrate and yttrium nitrate was prepared and ethylenediamine molecules were added into the aqueous solution. The obtained precipitated precursor particles were fired and oxide particles were obtained. When ethylenediamine was used for the precipitation, the single phase of YAG was obtained by firing the precursor particles at more than 1073 K. On the other hand, when hexamethylenediamine was used for the precipitation, the YAG phase was not able to obtained by firing the precursor at 1373 K. Formation behavior of YAG phase greatly depended on the used diamine molecules. Furthermore, Ce 3+ -doped YAG particles were prepared by firing precipitated particles from the aqueous solution in which the nitrates of Al 3+ , Y 3+, and Ce 3+ were dissolved with ethylenediamine as precipitating agent. The PL spectra of the obtained particles had the photoluminescence (PL) peak at 535 nm even though the firing temperature was 1073 K.

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Why so deep research on Yb3+-doped optical inorganic materials?

Cited by 192 publications

References 52 publications

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

Multi-ion cooperative processes in Yb3+ clusters

Synthesis of Ce<sup>3+</sup>-doped Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> phosphor particles by precipitation method with diamine molecules as precipitating agent

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Why so deep research on Yb3+-doped optical inorganic materials?

Cited by 192 publications

References 52 publications

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li6Ln(BO3)3:Yb3+ (Ln=Gd, Y) Borate Single Crystals

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li6Ln(BO3)3:Yb3+ (Ln=Gd, Y) Borate Single Crystals

Multi-ion cooperative processes in Yb3+ clusters

Synthesis of Ce<sup>3+</sup>-doped Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> phosphor particles by precipitation method with diamine molecules as precipitating agent

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Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals