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  • 1
    Electronic Resource
    Electronic Resource
    One-dimensional energy transfer in GdCl3 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5931-5942 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the observation of the intrinsic fluorescence of anydrous gadolinium trichloride GdCl3 when laser light is absorbed into the first excited state 6P7/2. With the aid of a frequency doubled pulsed dye laser, we are able to analyze carefully the excitation and emission spectra as well as the decay times over a range of temperatures including that at which the material undergoes a ferromagnetic transition at 2.2 K. At 4.4 K and above, experiments at low excitation density (N0〈1014 excited ions/cm3) show that the intrinsic and the impurity induced trap fluorescence dynamics are well described in terms of a fast diffusion and trapping model. When the excitation density is increased anti-Stokes fluorescences appear efficiently; they are assigned to the 6D9/2, 6I7/2→8S7/2 transitions. High excitation density effect on the intrinsic decay as well as the decay of the anti-Stokes fluorescence are nicely reproduced by a theoretical model involving mainly an exciton–exciton annihilation process. Moreover, an excited state absorption mechanism contributes notably to the anti-Stokes fluorescence intensity at t=0 with increasing the excitation density. In the ferromagnetic phase of GdCl3, at 1.5 K, the one-dimensional nature of the exciton diffusion (8S7/2↔6P7/2) is confirmed by the "incoherent'' exciton decay analysis using an appropriate model recently developed by Cibert et al. Finally a diffusion length spreading over 2500 visited Gd3+ normal sites is evaluated, knowing the hopping time as a function of the nearest neighbor interactions (nn) in the crude approximation of an ideal two level system in a linear chain of atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455544
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  • 2
    Electronic Resource
    Electronic Resource
    The sites of Gd3+ in the luminescent matrix La1−xGdxMgAl11O19: Single crystal structure determination and site-selective excitation of Gd3+ (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7076-7084 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Single crystals of La1−xGdxMgAl11O19 for x=0.02 to 1 have been grown from the melt by the Verneuil (flame fusion) method. The localization of Gd3+ ions in the matrix has been obtained using x-ray diffraction and Gd3+ fluorescence techniques giving the average and the local structure of the material. The resolution of the crystal structure, of La0.4Gd0.6MgAl11O19 homolog, indicates that this compound is of the distorted magnetoplumbite (MP) type (hexagonal P63/ mmc). Lanthanide ions lie in the mirror plane in two kinds of sites: the (2d) regular MP one (D3h symmetry) occupied by La3+ ions, the distorted (12j) one (Cs symmetry) partially filled up and containing only Gd3+. Some oxygen ions of the Ln coordination polyhedron may be missing leading to a lowering of the true symmetry of the sites. Site selective excitation of the fluorescence of Gd3+ and emission spectra have been carried out on crystals with different x values. It indicates that Gd3+ ions are distributed mainly among two sites, A and B. Crystal field analysis of the splitting of the 6P terms of Gd3+ determined on the excitation spectra show that site A is close to the ideal D3h symmetry while site B is a strongly distorted site. This leads to the identification A=(2d), B=(12j). The occupancy is larger for site B than for site A in agreement with the refinement of the structure. Selective laser excitation into the A site induces emission of the B sites as a result of energy transfer which is demonstrated by the fluorescence decay. No evidence of energy migration is found for gadolinium content up to 100%. Fluorescence spectroscopy and crystal structure determination appear complementary to obtain a detailed description of the sites of Gd3+ in La1−xGdxMgAl11O19.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459430
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  • 3
    Electronic Resource
    Electronic Resource
    Luminescence of In+ in Ce3+ and Tb3+-doped elpasolite-type fluoroindates (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5045-5053 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work deals with the identification of In+ ions in octahedral symmetry and the study of their optical properties in crystalline Rb2KInF6:Ce3+ and Rb2KInF6:Tb3+. The presence of In+ ions in the sites of In3+ has been confirmed exciting the Ce3+-doped sample at 41 600 and 32 360 cm−1 and exciting the Tb3+-doped sample at 41 600 cm−1. An hypothesis based on the In3+–Ce3+ and In3+–Tb3+ redox couples for the Ce3+- and Tb3+-doped elpasolite-type fluoroindates has been proposed in order to explain the presence of In+ at the mentioned excitation energies. This redox process is more efficient for the In3+–Ce3+ couple than for the In3+–Tb3+ one. Emission spectra and luminescence decays of In+ have been investigated at 5–300 K in both samples under the above mentioned excitations. Our experimental results have been compared to those obtained for In+-type ions as In+, Ga+, and Tl+ in alkali halides in literature. The transitions between the 5s5p excited configuration and the 5s2 configuration of In+ ions modified by the elpasolite matrix in Oh symmetry explain the optical data, if we take into account the spin-orbit coupling and Jahn–Teller effect (JTE). Finally, an additional fluorescence has been found in the Tb3+-doped sample; it has been assigned to In+ ions in potassium sites. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371477
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  • 4
    Electronic Resource
    Electronic Resource
    New setup for end-fire coupling excitation of planar waveguides at low temperatures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2275-2278 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This work describes a new experimental setup for end-fire coupling excitation of planar waveguides in the 300–10 K temperature range, which allows us to analyze their optical and spectroscopic properties through different techniques such as transmission, luminescence, or waveguide Raman spectroscopy. Two main novelties are relevant in this setup; (1) the use of long working distance microscope objectives, placed out of the cryostat, for both coupling and collecting guided light, and (2) the original set of mirrors, combined with different translation and rotation stages, which allows fine x,y,z,θ displacements of the beam focusing point preserving the laser beam alignment along the optical axis of the coupling objective. The setup has been tested in a series of Nd3+ doped ZBLA (ZrF4-BaF2-LaF3-AlF3) fluoride glass channel waveguides (from 2 to 40 μm width and 2 μm depth) obtained by ion-exchange and photolithography methods. The Nd3+ guided luminescence has been analyzed at low temperatures and compared to the spectra obtained for the bulk substrate. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148136
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  • 5
    Electronic Resource
    Electronic Resource
    Two-photon excitation of the Sm^2^+ ion in BaClF
    Amsterdam : Elsevier
    Inorganica Chimica Acta 139 (1987), S. 295-296 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)84099-2
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  • 6
    Electronic Resource
    Electronic Resource
    Luminescence of Ce^3^+ in the In"xSC"1" "-" "xB0"3 (0 =〈 x =〈 1) solid solution
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 55 (1994), S. 501-504 
    Details
    ISSN: 0022-3697
    Keywords: Borate ; cerium (III) ; indium ; luminescence ; scandium
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(94)90155-4
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  • 7
    Electronic Resource
    Electronic Resource
    Dependence of the ^5D"o -〉 ^5D"1 fluorescence dynamics versus the optical pumping frequency in Sm^2^+:BaClF
    Amsterdam : Elsevier
    Inorganica Chimica Acta 94 (1984), S. 87-88 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)94555-9
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  • 8
    Electronic Resource
    Electronic Resource
    The photon-avalanche effect: review, model and application
    Amsterdam : Elsevier
    Optical Materials 4 (1994), S. 43-49 
    Details
    ISSN: 0925-3467
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-3467(94)90054-X
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of stress and high magnetic field on the ^6A"1"g-〉 ^4T"1"g (^4G) absorption lines op CsMnF"3
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 43 (1982), S. 155-159 
    Details
    ISSN: 0022-3697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(82)90133-0
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  • 10
    Electronic Resource
    Electronic Resource
    A spectroscopic study of NaYF"4:Nd^3^+
    Amsterdam : Elsevier
    Journal of Luminescence 51 (1992), S. 175-187 
    Details
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2313(92)90052-B
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