Luminescent and scintillation properties of orthotantalates with common formulae RETaO4 (RE=Y, Sc, La, Lu and Gd)

Voloshyna, O.; Neicheva, S.; Starzhinskiy, N.; Zenya, I.; Gridin, S.; Baumer, V. N.; Sidletskiy, O.

doi:10.1016/j.mseb.2013.08.003

Cited by 44 publications

(36 citation statements)

References 17 publications

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“…The Eu 3+ CT in GdTaO 4 is consistently reported near 248 nm (5.0 eV). 118,123,124,126,128 With these parameters the VRBE scheme predicts the IVCT bands for Pr 3+ and Tb 3+ near 4.2 eV (295 nm). Noto et al 122 studied Pr 3+ in GdTaO 4 with VUV-techniques and a clear excitation maximum is observed at 265 nm (4.68 eV) that can be attributed to 4f-5d transitions.…”

Section: The Tantalatesmentioning

confidence: 99%

Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Dorenbos

Rogers

2014

ECS J. Solid State Sci. Technol.

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The electronic level schemes for divalent and trivalent lanthanide ions in rare earth (La, Gd, Y, Lu, Sc) vanadate, niobate, tantalate, and in alkaline earth (Ba, Sr, Ca, Mg) titanate, molybdate, and tungstate compounds are presented. Use is made of data from luminescence excitation and absorption spectra of lanthanide (mostly Eu 3+ , Pr 3+ , and Tb 3+ ) impurities in those compounds. By means of the chemical shift model, binding energies, relative to the vacuum energy, of electrons in the impurity levels and the host bands are obtained. It reveals clear trends in conduction band and valence band energy with changing size of the rare earth or the alkaline earth ion. The bottom of the conduction band is dominated by 3d, 4d, or 5d orbitals, and it is found that the binding energy at the conduction band bottom tends to decrease with higher orbital number. The vanadates, titanates, molybdates, niobates, tungstates, and tantalates are widely used in many areas of applied physics and materials science. TiO 2 is famous for its photocatalytic activity used to produce hydrogen in electrochemical cells upon absorption of sunlight. Many other titanates and also vanadates are actively being studied for such applications.1 It is then crucial that the electron binding energy E V at the top of the valence band and E C at the bottom of the conduction band lie closely below and above the redox potentials for hydrogen and oxygen production. Lanthanides in transition metal (TM) based compounds can produce very bright luminescence. For bright luminescence to occur, the location of the emitting impurity level relative to E C is important. A location too close to E C will result in poor quantum efficiency or even a total absence of emission because of thermal or autoionization of the excited electron to the conduction band. Whether a lanthanide or a transition metal impurity can trap an electron from the conduction band or a hole from the valence band is also controlled by the impurity level locations in the band gap. 2That same location tells us the preferred impurity valence state.3 The above examples demonstrate that knowledge on the electronic structure, i.e., the absolute binding energy of the electrons in impurity states, host band states, or molecules, is crucial for our understanding of the performance of materials.There is an abundance of data on lanthanide spectroscopy covering many thousands of different compounds. Data that can provide information on the location of lanthanide impurity levels relative to the valence and conduction bands of the host compound. Once the location of the 4f n ground state energy of one particular lanthanide impurity is known, say Eu 2+ , then it can be predicted for all other divalent lanthanides. This good predictability is caused by the atomic like and well-shielded nature of the inner lanthanide 4f-orbitals.4 Host referred binding energy (HRBE) schemes as for GdVO 4 in Fig. 1 where all energies are referred to the top of the valence band, see the righthand energy scale, can be made routinel...

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Section: The Tantalatesmentioning

confidence: 99%

Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Dorenbos

Rogers

2014

ECS J. Solid State Sci. Technol.

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“…Commonly, chemical forms of the rare-earth tantalates and niobates are written as REBO 4 , RE 3 BO 7 , REB 3 O 9 , REB 5 O 14 , and REB 7 O 19 , where RE means rare earth ions, and B are Ta or Nb elements [5,6]. Orthotantalates and orthoniobates REBO 4 belong to the fergusonite structure and have been reported extensively [7][8][9]. By comparison and analysis, REBO 4 exhibited excellent luminescent properties [10].…”

Section: Introductionmentioning

confidence: 99%

“…At present, with an increasing demand in dense, fast, and bright scintillators for high-energy physics, medical diagnostics, and security screening devices, the scintillation characteristics of the lanthanide orthotantalates and orthoniobates REBO 4 have been widely investigated for the development of new scintillator materials [9,14,15]. Among REBO 4 materials, RETaO 4 are favorable for the registration of high-energy particles due to their extremely high density ranging from 7.8 g/cm 3 for LaTaO 4 to 9.75 g/cm 3 for LuTaO 4 , which are partly higher than the density of Bi 4 Ge 3 O 12 (BGO 7.1 g/cm 3 ) and PbWO 4 (PWO 8.28 g/cm 3 ).…”

Section: Introductionmentioning

confidence: 99%

“…Normally, the rare-earth tantalates are 7.8 g/cm 3 for LaTaO4 to 9.75 g/cm 3 for LuTaO4, which are partly higher than the density of Bi4Ge3O12 (BGO 7.1 g/cm 3 ) and PbWO4 (PWO 8.28 g/cm 3 ). Normally, the rare-earth tantalates are studied systematically with polycrystalline samples produced by solid-state reaction [9]. Although the optical absorption and luminescence of RETaO4 crystals are described, the crystal size is too small, only 7 mm × 7 mm × 1 mm [10].…”

Section: Introductionmentioning

confidence: 99%

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Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

et al. 2018

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Rare-earth tantalates, with high density and monoclinic structure, and niobates with monoclinic structure have been paid great attention as potential optical materials. In the last decade, we focused on the crystal growth technology of rare-earth tantalates and niobates and studied their luminescence and physical properties. A series of rare-earth tantalates and niobates crystals have been grown by the Czochralski method successfully. In this work, we summarize the research results on the crystal growth, scintillation, and laser properties of them, including the absorption and emission spectra, spectral parameters, energy levels structure, and so on. Most of the tantalates and niobates exhibit excellent luminescent properties, rich physical properties, and good chemical stability, indicating that they are potential outstanding scintillators and laser materials.

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“…Light output of the yttrium orthotantalate pellet with scintillation properties depicted in [3] was taken as etalon. …”

Section: Scintillation Properties Oftantalo-niobatesmentioning

confidence: 99%

Luminescent and scintillation characteristics of RE(Nb<inf>x</inf>Ta<inf>1−x</inf>)O<inf>4</inf> compounds (RE=Y or Gd)

Voloshyna

Boiaryntseva

Spassky

et al. 2014

International Conference on Oxide Materials for Electronic Engineering - Fabrication, Properties and Applications (OMEE-2014)

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Samples of undoped yttrium and gadolinium tantalo-niobates with common formulae RE(Nb x Tal __ J04, where RE = Yor Gd, and x = 0-1, have been obtained by solid-state reaction. Optical and luminescent characteristics in visible and UV spectral regions have been studied. The most intense luminescence is determined for yttrium tantalo niobates with intermediate value of Nb content in the matrix and for heavy Nb -doped gadolinium tantalo-niobates.

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Luminescent and scintillation properties of orthotantalates with common formulae RETaO4 (RE=Y, Sc, La, Lu and Gd)

Cited by 44 publications

References 17 publications

Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

Luminescent and scintillation characteristics of RE(Nb<inf>x</inf>Ta<inf>1−x</inf>)O<inf>4</inf> compounds (RE=Y or Gd)

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Luminescent and scintillation properties of orthotantalates with common formulae RETaO4 (RE=Y, Sc, La, Lu and Gd)

Cited by 44 publications

References 17 publications

Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

Luminescent and scintillation characteristics of RE(Nb<inf>x</inf>Ta<inf>1&#x2212;x</inf>)O<inf>4</inf> compounds (RE=Y or Gd)

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Luminescent and scintillation characteristics of RE(Nb<inf>x</inf>Ta<inf>1−x</inf>)O<inf>4</inf> compounds (RE=Y or Gd)