Especialities of Ti3+ excitation in YAlO3 crystals

Baryshnikov, V. I.; Kvapil, Jiří; Sarukura, Nobuhiko; Segawa, Y.

doi:10.1016/s0022-2313(96)00156-1

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…2 T 2 from the Ti 3 ions in an octahedral site [21]. The peak position of this band is also comparable to that of Ti 3 :YAlO 3 [22]. The comparison with the Ti 3 :Al 2 O 3 crystal shows that our system presents the emission shifted towards shorter wavelengths, as illustrated in curve (a) of Fig.…”

supporting

confidence: 63%

Long Fluorescence Lifetime ofTi3+-Doped Low Silica Calcium Aluminosilicate Glass

et al. 2008

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This Letter reports the formation of Ti3+ in OH- free aluminosilicate glass melted under vacuum condition, with a very long lifetime (170 micros) and broad emission band shifted towards the visible region. This lifetime value was attributed to the trapping of the excited electrons by the glass defects and detrapping by thermal energy, and it is 2 orders of magnitude higher than those published for Ti3+ doped materials. Our results suggest that this glass is a promising system to overcome the challenge of extending the spectral range of traditional tunable solid state lasers towards the visible region.

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supporting

confidence: 63%

Long Fluorescence Lifetime ofTi3+-Doped Low Silica Calcium Aluminosilicate Glass

et al. 2008

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“…40 The peak position of this band is also comparable to that of some crystals such as Ti 3+ : YAlO 3 . 41 Our system presents the emission band shifted toward shorter wavelengths in comparison with the Ti 3+ :Al 2 O 4 crystal as shown in Fig. 8.…”

Section: A Spectroscopic Characterization Of Color Centers In the Unmentioning

confidence: 62%

Spectroscopic assignments ofTi3+andTi4+in titanium-doped
Andrade
¹
,
Lima
²
,
Novatski
³

et al. 2008
Phys. Rev. B
33
1
14
1
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In this work we present the spectroscopic assignments of Ti 3+ and Ti 4+ in titanium-doped OH − free lowsilica calcium aluminosilicate glass and the influence of structural defects on the observed long lifetime and high fluorescence intensity of Ti 3+ ions. Measurements were performed with electron-spin resonance ͑ESR͒, time resolved luminescence, ultraviolet-visible ͑UV-VIS͒ optical excitation and emission spectra, and conventional optical absorption and photoconductivity. The ESR data showed that the Ti 3+ / Ti 4+ ratio increases with the doping concentration and that the Ti 3+ ions are in distorted octahedral sites. The assignment of the Ti 3+ and Ti 4+ emission bands derived from the spectroscopic results allowed us to propose a model explaining the mechanisms involved in the luminescence processes. The long lifetime of the Ti 3+ emission around 650 nm ͑on the order of 170 s͒ is about two orders of magnitude higher than the values found in the literature and was associated to the trapping of the excited electrons by the glass defects followed by detrapping via defect recombination. In conclusion, the combination of several techniques permitted a comprehensive characterization of the Ti ions in this OH − free glass.

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“…In the case of crystals grown by the Czochralski method we observe the disappearance of the color on annealing (1200 °C) the crystal in a reducing (H 2 /N 2 ) atmosphere. Although some attempts − were made to solve the problem, there is still no clear explanation as to the nature of these color centers as well as their role and influence on the lasing properties of YAPs. We want to shed new light on these problems using XPS.…”

Section: Introductionmentioning

confidence: 99%

ESCA Studies of Yttrium Orthoaluminum Perovskites

et al. 1999

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Room temperature X-ray photoelectron spectroscopy (XPS or ESCA) has been employed to investigate pure single crystals of yttrium aluminum perovskite (YAlO 3 (YAP)) and YAlO 3 doped with several rare earth elements, Y 1-x Ln x AlO 3 (Ln ) Pr, Er, Ho). XPS peak shapes of the main elements forming the YAP structure, in structures that have been doped with ions of varying oxidation states, are rationalized as a function of structural environment and the oxidation state of doping ions. The significant changes in chemical shifts and full widths at half-maximum of the signals are caused by doping and the presence of color centers. The most distinctive change in chemical shifts is observed for the O(1s) peaks. Annealing in H 2 /N 2 atmosphere (1200 °C) changes the color of the sample, removing color centers due to relocation of oxygen ions in the structure. Although the total amount of oxygen in the samples does not change, the relative ratio of oxygen ions occupying two independent positions in the structure changes on annealing. Only in the case of YAlO 3 without color centers is the composition of crystal close to the stoichiometric one. Also the Y(3d) and Al(2p) signals are shifted to higher binding energies for doped YAP crystals.

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Especialities of Ti3+ excitation in YAlO3 crystals

Cited by 7 publications

References 2 publications

Long Fluorescence Lifetime ofTi3+-Doped Low Silica Calcium Aluminosilicate Glass

Long Fluorescence Lifetime ofTi3+-Doped Low Silica Calcium Aluminosilicate Glass

Spectroscopic assignments ofTi3+andTi4+in titanium-doped
Andrade
¹
,
Lima
²
,
Novatski
³

et al. 2008
Phys. Rev. B
33
1
14
1
View full text Add to dashboard Cite

ESCA Studies of Yttrium Orthoaluminum Perovskites

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Especialities of Ti3+ excitation in YAlO3 crystals

Cited by 7 publications

References 2 publications

Long Fluorescence Lifetime ofTi3+-Doped Low Silica Calcium Aluminosilicate Glass

Long Fluorescence Lifetime ofTi3+-Doped Low Silica Calcium Aluminosilicate Glass

Spectroscopic assignments ofTi3+andTi4+in titanium-dopedAndrade1, Lima2, Novatski3 et al. 2008Phys. Rev. B331141View full textAdd to dashboardCite

ESCA Studies of Yttrium Orthoaluminum Perovskites

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Spectroscopic assignments ofTi3+andTi4+in titanium-doped
Andrade
¹
,
Lima
²
,
Novatski
³

et al. 2008
Phys. Rev. B
33
1
14
1
View full text Add to dashboard Cite