Luminescence mechanism of (Pr, Al)-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>fine particles investigated by x-ray absorption spectroscopy

Deguchi, Masataka; Nakajima, N.; Kawakami, Kimihiro; Ishimatsu, Naoki; Maruyama, Hiroshi; Moriyoshi, Chikako; Kuroiwa, Yoshihiro; Nozawa, Shiro; Ishiji, Kotaro; Iwazumi, Toshiaki

doi:10.1103/physrevb.78.073103

Cited by 11 publications

(14 citation statements)

References 19 publications

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“…Instead, the single axial vibration of the Ti atom along the Ti-O direction was concluded. Quite similar results were reported by Deguchi et al 9) for SrTiO 3 ;Pr 3þ , Al (Pr-STO), a practical red phosphor used in vacuum fluorescence displays. Pr-STO fine powders emit brilliant red light under UV irradiation at room temperature and the chemical shift of Ti 4p bands and the single axial vibration of the Ti atom were also evidenced by the Ti K-edge XAS.…”

Section: Introductionsupporting

confidence: 87%

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X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO₃:Pr³⁺,Al

Nakajima

Deguchi

Maruyama

et al. 2010

Jpn. J. Appl. Phys.

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The electronic structure of the practical red phosphor SrTiO3;Pr3+,Al is studied by X-ray absorption and emission spectroscopy under ultraviolet (UV) irradiation. In contrast to the invariance of the oxygen Kα emission spectra, the titanium K-edge absorption spectra show two characteristic changes depending on UV energy, one of which is proportional to the photoluminescence excitation spectrum while the other is insensitive to it. With these results, a schematic energy diagram is proposed where the titanium 4p band pulled down by oxygen valence holes overlaps Pf 4f radiative centers situated just below the conduction band. The photoluminescence properties are briefly discussed in relation to the ferroelectric phase transition from an electronic viewpoint.

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Section: Introductionsupporting

confidence: 87%

“…A small amount of Pr-STO powder with the same lot number as that in our previous study 9) was used in this study. The sample was synthesized by a solid-phase method from a mixture of SrCO 3 , TiO 2 , PrCl 4 and Al(OH) 3 and was ground to obtain a powder with an average particle size of 1-3 mm.…”

Section: Experimental Methodsmentioning

confidence: 99%

X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO₃:Pr³⁺,Al

Nakajima

Deguchi

Maruyama

et al. 2010

Jpn. J. Appl. Phys.

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“…The greenish luminescence (GL) having a maximum at 2.2-2.4 eV of photon energy (wavelength λ ≈ 500 nm) that is emitted by pure STO at low temperature under exposure to UV or X-ray radiation has been known since a long time, 12,13,14 and is generally ascribed to the decay of intrinsic self-trapped excitons (STE). 15,16,17,18 A STE can be roughly depicted as a tightly bound state of a hole and a Ti 3+ polaron. 19,20 However, this purely intrinsic scenario has been recently called into question by Mochizuki et al, 21,22 who argued for a crucial role of defects and possibly of surfaces in this GL emission.…”

Section: Introductionmentioning

confidence: 99%

Blue luminescence of SrTiO3 under intense optical excitation

Rubano

Paparo²,

Miletto³

et al. 2009

Journal of Applied Physics

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The blue-green photoluminescence emitted by pure and electron-doped strontium titanate under intense pulsed near-ultraviolet excitation is studied experimentally as a function of excitation intensity and temperature. Both emission spectra and time-resolved decays of the emission are measured and analyzed in the framework of simple phenomenological models. We find an interesting blue-to-green transition occurring for increasing temperatures in pure samples, which is absent in doped materials. The luminescence yield and decay rate measured as a function of temperature can be modeled well as standard activated behaviors. The leading electron-hole recombination process taking place in the initial decay is established to be second order, or bimolecular, in contrast to recent reports favoring a third-order interpretation as an Auger process. The temporal decay of the luminescence can be described well by a model based on two interacting populations of excitations, respectively identified with interacting defect-trapped possibly forming excitons and mobile charges. Finally, from the measured doping and sample dependence of the luminescence yield, we conclude that the radiative centers responsible for the luminescence are probably intrinsic structural defects other than bulk oxygen vacancies

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“…Its main concept is as follows: upon absorption of UV light, electrons pass from the oxygen 2p level to the titanium 3d levels hybridized with 4p levels. It was shown in [25,26] that a titanium atom in octahedral environment vibrates along the To-O axis under ultraviolet light, due to which Ti 4p levels can partially be overlapped with Pr 4f levels. As a result, electrons migrate from the hybridized titanium 3d level to the praseodymium 4f level to excite it.…”

Section: Discussionmentioning

confidence: 99%

Study of the photoluminescence properties of crystal phosphors SrTiO3:Pr3+ and SrTiO3:Pr3+, Al

et al. 2015

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Fine-grained powder crystal phosphors SrTiO 3 :Pr 3+ and SrTiO 3 :Pr 3+ , Al have been investigated. Their photoexcitation, luminescence, and photoconductivity spectra have been recorded. It is found that only one center ( ) is responsible for the luminescence in SrTiO 3 :Pr 3+ , while the luminescence in SrTiO 3 :Pr 3+ , Al is due to two centers: ( ) × and . A mechanism of energy transfer upon luminescence excitation from the ( ) × center is proposed.

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Luminescence mechanism of (Pr, Al)-dopedSrTiO3fine particles investigated by x-ray absorption spectroscopy

Cited by 11 publications

References 19 publications

X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO₃:Pr³⁺,Al

X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO₃:Pr³⁺,Al

Blue luminescence of SrTiO3 under intense optical excitation

Study of the photoluminescence properties of crystal phosphors SrTiO3:Pr3+ and SrTiO3:Pr3+, Al

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Luminescence mechanism of (Pr, Al)-dopedSrTiO3fine particles investigated by x-ray absorption spectroscopy

Cited by 11 publications

References 19 publications

X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO3:Pr3+,Al

X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO3:Pr3+,Al

Blue luminescence of SrTiO3 under intense optical excitation

Study of the photoluminescence properties of crystal phosphors SrTiO3:Pr3+ and SrTiO3:Pr3+, Al

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Product

Resources

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X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO₃:Pr³⁺,Al

X-ray Spectroscopic Study on Photoluminescence Properties of Red Phosphor SrTiO₃:Pr³⁺,Al