Mechanism of long-lasting phosphorescence process of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></m

Yamaga, M.; Tanii, Yoshifumi; Kodama, Nobuhiro; Takahashi, Tomoko; Honda, Makoto

doi:10.1103/physrevb.65.235108

Cited by 71 publications

(51 citation statements)

References 18 publications

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“…Recently, holes in Ca 2 Al 2 SiO 7 single crystals including both AlO 4 and SiO 4 tetrahdra were observed to be self-trapped in the form of AlO 4 by ESR [13]. Taking account of these results, holes are assumed to be selftrapped in the form of GaO 4 in β-Ga 2 O 3 through strong electron-phonon interaction, while the wavefunctions of conduction electrons are also assumed to be extended from GaO 6 octahedra toward the interstitial sites [11,12].…”

Section: A Model Of Luminescent Centresmentioning

confidence: 98%

Polarization of optical spectra in transparent conductive oxide β‐Ga₂O₃

Yamaga

Ishikawa

Yoshida

et al. 2011

Phys. Status Solidi C

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Abstractβ‐Ga2O3 single crystals have the band gap energy of 4.8 eV. Luminescence spectra in β‐Ga2O3 crystals excited above the band gap energy consist of UV and blue/green broad bands. Polarization of the optical absorption and luminescence spectra and decay curves of the luminescence observed in the temperature range from 14 to 300 K can identify the luminescent centres. The UV luminescent centre with a lifetime of 1.5 μs is assigned as self‐trapped exciton, consisting of self‐trapped hole in the form of GaO4 tetrahedral complex and bound electron. As the decay curves of the blue/green luminescence bands fit a power function of t‐n (n∼0.8), the luminescence occurs through recombination of donors and acceptors in the crystal. The donor is coincident with a conduction electron trapped at single or coupled oxygen vacancies in the crystal estimated from electron‐spin resonance (ESR) (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: A Model Of Luminescent Centresmentioning

confidence: 98%

Polarization of optical spectra in transparent conductive oxide β‐Ga₂O₃

Yamaga

Ishikawa

Yoshida

et al. 2011

Phys. Status Solidi C

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“…For the used seed crystal orientation along [110] the grown crystals usually show a cylindrical shape and small facets of faces (210), (110), and (120) at the bottom side of the crystal. Both principal refractive indices n 1 (=n o ) and n 3 (=n e ) of Ba 2 MgGe 2 O 7 were determined by the prism method and normal incidence using a prism with incidence face (110). Data were collected at 14 discrete wavelengths in the region between 0.365 μm and 2.325 μm with a goniometer-spectrometer system (Möller-Wedel).…”

Section: Data Collectionmentioning

confidence: 99%

Tetragonal Ba₂MgGe₂O₇- a novel multifunctional optical crystal with numerous manifestations of nonlinear-laser effects: almost sesqui-octave Stokes and anti-Stokes combs and cascadedχ⁽³⁾↔χ⁽²⁾lasing with involved second and third harmonic generation

et al. 2008

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“…Figure 7 shows decay curves of afterglow nanoparticles at each PEG concentration. Afterglow is caused by the recombination of the trapped carriers [14,[27][28][29][30][31]. For example, trapped holes migrate to the valence band using the thermal energy available at room temperature.…”

Section: Experimental Methodsmentioning

confidence: 99%

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Yoshimura

Ishizaki

Wakai

et al. 2012

Advances in Optical Technologies

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The optical properties of afterglow nanoparticles were successfully improved by the addition of polyethylene glycol (PEG) to an afterglow colloidal solution. Afterglow nanoparticles-Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ -were prepared by laser ablation in liquid. The quantum yields and the decay curves were measured by a fluorescence spectrophotometer. An increase in the amount of PEG added to the solution increased the quantum yield of the nanoparticles and improved the afterglow property in the initial portion of the decay curve. However, the afterglow property did not change after a substantial amount of time had passed. The afterglow nanoparticles were capped with PEG molecules, and surface defects of the nanoparticles were passivated, which decreased the optical properties.

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Mechanism of long-lasting phosphorescence process ofCe3+-dopedCa2

Cited by 71 publications

References 18 publications

Polarization of optical spectra in transparent conductive oxide β‐Ga₂O₃

Polarization of optical spectra in transparent conductive oxide β‐Ga₂O₃

Tetragonal Ba₂MgGe₂O₇- a novel multifunctional optical crystal with numerous manifestations of nonlinear-laser effects: almost sesqui-octave Stokes and anti-Stokes combs and cascadedχ⁽³⁾↔χ⁽²⁾lasing with involved second and third harmonic generation

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

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Mechanism of long-lasting phosphorescence process ofCe3+-dopedCa2

Cited by 71 publications

References 18 publications

Polarization of optical spectra in transparent conductive oxide β‐Ga2O3

Polarization of optical spectra in transparent conductive oxide β‐Ga2O3

Tetragonal Ba2MgGe2O7- a novel multifunctional optical crystal with numerous manifestations of nonlinear-laser effects: almost sesqui-octave Stokes and anti-Stokes combs and cascadedχ(3)↔χ(2)lasing with involved second and third harmonic generation

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

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Polarization of optical spectra in transparent conductive oxide β‐Ga₂O₃

Polarization of optical spectra in transparent conductive oxide β‐Ga₂O₃

Tetragonal Ba₂MgGe₂O₇- a novel multifunctional optical crystal with numerous manifestations of nonlinear-laser effects: almost sesqui-octave Stokes and anti-Stokes combs and cascadedχ⁽³⁾↔χ⁽²⁾lasing with involved second and third harmonic generation