Evaluation of stoichiometric rare-earth molybdate and tungstate compounds as laser materials

Oishi, Shuji; Shishido, T.; Yamazaki, Makoto; Iida, S.

doi:10.1016/j.jpcs.2005.09.058

Cited by 105 publications

(45 citation statements)

References 7 publications

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“…In NaNd(WO 4 ) 2 , laser oscillation related to the transition from 4 F 3/2 to 4 I 11/2 in Nd 3+ has been observed at liquid nitrogen temperature [4]. Since we have a great deal of interest in stoichiometric rare-earth compounds such as EuGa 2 S 4 [5], we have shown the feasibility of NaNd(MoO 4 ) 2 , which has the same scheelite structure as NaNd(WO 4 ) 2 , as a laser material by comparing the photoluminescence properties in the previous report [6]. However, the discussion was based simply on intensity comparison of the 0.89 µm emission due to the 4 F 3/2 -4 I 9/2 transition in Nd 3+ .…”

Section: Introductionmentioning

confidence: 64%

“…Since KNd(WO 4 ) 2 has the largest lattice constant of a = 5.732 Å and c = 11.93 Å in the compounds used in this study, there is some possibility that interaction between Nd 3+ ions affect the emission properties. In our previous report [6], we concluded that NaNd(MoO 4 ) 2 is more suitable for laser material than NaNd(Mo 4 ) 2 from a viewpoint of transition probability based on the data of decay time constants and the emission intensities taking no account of the absorption. Measurements of relative efficiencies in this study suggest that the differences of the time constants and intensities were due to the differences of the rates of non-radiative transition and the amounts of absorption.…”

Section: Methodsmentioning

confidence: 94%

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Charge compensation effect on photoluminescence properties of stoichiometric neodymium molybdate and tungstate

Uchitomi

Oishi

Shishido

et al. 2006

Phys. Status Solidi (c)

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PACS 78. 45.+h, 78.55.Hx Photoluminescence spectra of stoichiometric rare-earth molybdate and tungstate compounds MNd(MoO 4 ) 2 , MNd(WO 4 ) 2 (M=Li, Na, K) have been investigated. All the compounds exhibit emissions around 0.89 µm, 1.06 µm and 1.34 µm due to the transitions from 4 F 3/2 to 4 I 9/2 , 4 I 11/2 and 4 I 13/2 , respectively, in Nd 3+. The Nd 3+ emissions from the stoichiometric Nd molybdate and tungstate, which are charge-compensated by alkali atoms of Li and K are the first observations to the best of our knowledge. Amoung these compounds, the efficiency of the Nd emission, defined as ratio of emission intensity measured with integration semi-sphere to the real absorption, is the highest and the line width of the 1.06 µm emission is the narrowest for KNd(WO 4 ) 2 . These results suggest a sufficient potentiaslity of KNd(WO 4 ) 2 as a stoichiometric laser material.

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Section: Introductionmentioning

confidence: 64%

Section: Methodsmentioning

confidence: 94%

Charge compensation effect on photoluminescence properties of stoichiometric neodymium molybdate and tungstate

Uchitomi

Oishi

Shishido

et al. 2006

Phys. Status Solidi (c)

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“…Because of their properties, metal tungstates are potential candidates for use in phosphors, in scintillating detectors, and in optoelectronic devices including lasers. [1][2][3] Tungstates usually crystallize in either the tetragonal scheelite or monoclinic wolframite crystal structure for large (A = Ba, Ca, Eu, Pb, Sr) or small (A = Co, Cd, Fe, Mg, Ni, Zn) cations, respectively. 4 The highly anisotropic monoclinic cadmium tungstate (CdWO 4 ) is of particular interest for scintillator applications, because it is nonhygroscopic, has high density (7.99 g/cm 3 ) and therefore high X-ray stopping power, 2 its emission centered near 480 nn falls within the sensitive region of typical silicon-based CCD detectors, 5 and its scintillation has high light yield (14,000 photons/MeV) with little afterglow.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy, phonon modes, and lattice anharmonicity from dielectric function tensor analysis of monoclinic cadmium tungstate

et al. 2017

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We determine the frequency dependence of four independent Cartesian tensor elements of the dielectric function for CdWO4 using generalized spectroscopic ellipsometry within mid-infrared and far-infrared spectral regions. Different single crystal cuts, (010) and (001), are investigated. From the spectral dependencies of the dielectric function tensor and its inverse we determine all longwavelength active transverse and longitudinal optic phonon modes with Au and Bu symmetry as well as their eigenvectors within the monoclinic lattice. We thereby demonstrate that such information can be obtained completely without physical model line shape analysis in materials with monoclinic symmetry. We then augment the effect of lattice anharmonicity onto our recently described dielectric function tensor model approach for materials with monoclinic and triclinic crystal symmetries [Phys. Rev. B, 125209 (2016)], and we obtain an excellent match between all measured and modeled dielectric function tensor elements. All phonon mode frequency and broadening parameters are determined in our model approach. We also perform density functional theory phonon mode calculations, and we compare our results obtained from theory, from direct dielectric function tensor analysis, and from model lineshape analysis, and we find excellent agreement between all approaches. We also discuss and present static and above reststrahlen spectral range dielectric constants. Our data for CdWO4 are in excellent agreement with a recently proposed generalization of the Lyddane-Sachs-Teller relation for materials with low crystal symmetry [Phys. Rev. Lett. 117, 215502 (2016)].

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“…The two bands are the characteristic vibrations of water molecules from air physically absorbed on the sample surface, which is completely different from coordinated water in compounds. The strong absorption peaks at 911.9, 807.1 and 728.0 cm -1 are assigned to stretching vibration of O-Mo-O in MoO4 2-tetrahedron[28].…”

mentioning

confidence: 98%

“…5. The bands at 3,363-1,649 cm -1 are assigned to O-H stretching vibration and H-O-H bending vibration, respectively[28,29]. The two bands are the characteristic vibrations of water molecules from air physically absorbed on the sample surface, which is completely different from coordinated water in compounds.…”

mentioning

confidence: 99%

Enhanced photoluminescence of Li3Ba2Gd3 (MoO4)8:Eu3+ red phosphor synthesized by mechanochemically assisted direct solid state reaction method at room temperature

Peter¹,

Banu

2014

J Mater Sci: Mater Electron

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For the first time, Li 3 Ba 2 Gd 3-x (MoO 4 ) 8 :x Eu 3? (x = 0.01, 0.03, 0.05, 0.07 and 0.09 mol) red phosphor nanoparticles were prepared using the simple mechanochemically assisted direct solid state reaction method at room temperature and the luminescence effects as a function of Eu 3? ion concentration were studied. The characteristics of the phosphor materials were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence and kinetic decay. For 7 mol% of Eu 3? concentration, the phosphor exhibits a strong excitation peak at 395 nm signifying a strong absorption. The PL emission spectra of Li 3 Ba 2 Gd 3 (MoO 4 ) 8 :0.07 Eu 3? phosphors exhibited an intense peak at 615 nm (red) which relates to 5 D 0 ? 7 F 2 transition of Eu 3? . The most favourable Eu 3? concentration in Li 3 Ba 2 Gd 3 (MoO 4 ) 8 phosphors for intensified red emission results for 7 mol% and above this concentration, the emission intensity falls off as a result of quenching effect. The CIE color coordinates of the Li 3 Ba 2 Gd 3 (MoO 4 ) 8 :0.07 Eu 3? red phosphor coexist very well with the standard values of NTSC. The red emission intensity of the as prepared Li 3 Ba 2 Gd 3 (MoO 4 ) 8 :0.07 Eu 3? red phosphor is 3.2 times better than that of the commercial Y 2 O 2 S:Eu 3? red phosphor prepared by the conventional solid state reaction method.

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Evaluation of stoichiometric rare-earth molybdate and tungstate compounds as laser materials

Cited by 105 publications

References 7 publications

Charge compensation effect on photoluminescence properties of stoichiometric neodymium molybdate and tungstate

Charge compensation effect on photoluminescence properties of stoichiometric neodymium molybdate and tungstate

Anisotropy, phonon modes, and lattice anharmonicity from dielectric function tensor analysis of monoclinic cadmium tungstate

Enhanced photoluminescence of Li3Ba2Gd3 (MoO4)8:Eu3+ red phosphor synthesized by mechanochemically assisted direct solid state reaction method at room temperature

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