Exciton transition and electronic structure of PbMoO<sub>4</sub>
 crystals studied by polarized light

Fujita, Masami; Itoh, Minoru; Mitani, Hiroyuki; Sangeeta, .; Tyagi, Mohit

doi:10.1002/pssb.200945447

Cited by 22 publications

(24 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The width of the tail in ZnMoO 4 (0.34 eV) is typical for tungstates and molybdates where luminescence of self-trapped excitons is observed, i.e. ZnWO 4 (0.4 eV), MgWO 4 (0.35), PbMoO 4 (0.2) [7,37,38]. It should be noted that there are no sharp peaks in the reflectivity of ZnMoO 4 that can be considered as characteristic excitonic peaks ( figure 5(a)).…”

Section: Analysis Of the Excitation Spectra Of The Intrinsic Luminescmentioning

confidence: 96%

“…On the basis of experimental data on photostimulated recombination luminescence, it was shown that electronic states of XO 2− 4 molecular anions of such crystals actively participate in excitation of intrinsic emission in the region of excitation energies up to ∼1.5 eV above the fundamental absorption edge [39,40]. The A cations have considerably higher contribution at the TVB in AXO 4 compounds with 'heavy' cations, namely Pb [7,11,16], and therefore an active participation of the Pb states in excitation of intrinsic emission is considered to be highly probable [38,41,42].…”

Section: Analysis Of the Excitation Spectra Of The Intrinsic Luminescmentioning

confidence: 99%

See 1 more Smart Citation

Electronic structure and luminescence mechanisms in ZnMoO₄crystals

Spassky¹,

Vasil’ev²,

Kamenskikh³

et al. 2011

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Calculations of the band structure, partial densities of states and optical spectra of permittivity, reflectivity and absorption of perfect ZnMoO 4 crystal were performed using the full-potential linear-augmented-plane-wave method. It is shown that the calculated reflectivity spectra reproduce the main features of corresponding experimental spectra in the fundamental absorption region. The bandgap value of ZnMoO 4 is estimated as E g = 4.3 eV. Peculiarities of luminescence excitation spectra corrected for near-surface losses and losses on reflectivity are discussed, taking into account the results of the calculations. It is found that the energy structure of the lower part of conduction band is manifested in the excitation spectra of the intrinsic luminescence. The excitation spectra in the region 4.3-8.0 eV are formed by band-to-band electronic transitions mainly within the molybdate groups MoO 2− 4 , whereas electronic states of Zn 2+ cations are not directly involved into the excitation processes. It is shown that the structure of the intrinsic luminescence excitation spectrum depends on the temperature and mechanisms of the structure modification are discussed.

show abstract

Section: Analysis Of the Excitation Spectra Of The Intrinsic Luminescmentioning

confidence: 96%

Section: Analysis Of the Excitation Spectra Of The Intrinsic Luminescmentioning

confidence: 99%

Electronic structure and luminescence mechanisms in ZnMoO₄crystals

Spassky¹,

Vasil’ev²,

Kamenskikh³

et al. 2011

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…As an important member of this family, lead molybdate (PbMoO 4 ) has gained increasing interest due to its use in a wide range of technological and theoretical fields 12, [14][15][16][17][18][19][20][21][22][23][24] , and experimental studies on the optical properties of lead molybdate have been published by different research groups. 16,19,[25][26][27][28][29][30][31][32][33][34] PbMoO 4 crystallizes in tetragonal scheelite-structure having point group symmetry 4/m and space group I41/a, with two formula units per primitive cell. 5,6 , and a specific feature of these systems is the existence of two different clusters into crystal lattice, in which each Mo is surrounded by four equivalent O atoms composing the ሾMoO ସ ሿ ଶି tetrahedral configuration and each divalent metal, Pb, shares corners with eight adjacent O atoms, forming a ሾPbO ଼ ሿ ଶି configuration.…”

Section: Introductionmentioning

confidence: 99%

Toward Understanding the Photocatalytic Activity of PbMoO₄Powders with Predominant (111), (100), (011), and (110) Facets. A Combined Experimental and Theoretical Study

et al. 2013

View full text Add to dashboard Cite

A complimentary combination of experimental work and first principle calculations, based on the Density Functional Theory (DFT) method, has been used to increase our limited understanding of the enhanced photocatalytic activity of PbMoO 4 powders with predominant (111), (100), (011), and (110) facets.In this work, PbMoO 4 powders were prepared by the co-precipitation method and processed on a hydrothermal reactor at 100 o C/10 minutes. The variation of different types of modifier such as acetylacetone (acac) or polyvinylpyrrolidone (PVP) is found to play a crucial role in controlling the particle size and morphology of products and their photocatalytic properties.The structure and morphology of these crystals were characterized by X-ray diffraction (XRD), micro-Raman (MR) spectroscopy, field-emission gun scanning electron microscopy (FEG-SEM), and ultraviolet visible (UV-vis) absorption spectroscopy. Furthermore, the assynthesized PbMoO 4 micro-octahedrons without presence of (001) surface exhibit enhanced activity for the photodegradation of rhodamine B (RhB) under ultraviolet-visible light irradiation.Based on the theoretical and experimental results, we provide a complete assignment of the micro-Raman spectra of PbMoO 4 , while a growth mechanism for the formation of PbMoO 4 micro-octahedrons was systematically discussed, and a schematic illustration of the probable formation of morphologies in the whole of the synthetic process was also proposed, which reveals that the high photocatalytic activity is attributed to the absence of (001) facet.

show abstract

“…The above-bandgap excitation of PbMoO 4 was made by the fourth harmonics (266 nm; 4.66 eV) of a Nd:YAG laser [7]. The pulse duration, repetition rate, and power density on the sample surface were 7 ns, 10 Hz, and 10 MW cm −2 , respectively.…”

mentioning

confidence: 99%

Time‐resolved composite nature of the self‐trapped exciton luminescence in PbMoO₄

Kajitani¹,

Itoh²

2010

Phys. Status Solidi (c)

Self Cite

View full text Add to dashboard Cite

Time‐resolved luminescence measurements have been carried out for PbMoO4 crystals with the scheelite structure. A fast‐decaying luminescence band with a lifetime of the order of 10 ns is observed at 400 nm at low temperatures (T < 170 K). This luminescence is tentatively assigned to the radiative transition of a singlet excited state of a self‐trapped exciton (STE) located on a (MoO4)2–ion. The green luminescence, which is ascribed to the triplet STE states in PbMoO4, is found to consist of three emission bands peaking at 405, 520, and 600 nm at T = 150–220 K. Such a composite nature is explained by taking into account the symmetry lowering of (MoO4)2– ions due to the Jahn‐Teller effect. The present observation provides strong support to the previous results of PbWO4, in which the triplet STE luminescence is also decomposed into three individual bands. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Exciton transition and electronic structure of PbMoO₄ crystals studied by polarized light

Abstract: Received ZZZ, revised ZZZ, accepted ZZZ Published online ZZZ (Dates will be provided by the publisher.)PACS 71.35.Cc, 78.20.Ci, 71.35.Aa,

Cited by 22 publications

References 32 publications

Electronic structure and luminescence mechanisms in ZnMoO₄crystals

Electronic structure and luminescence mechanisms in ZnMoO₄crystals

Toward Understanding the Photocatalytic Activity of PbMoO₄Powders with Predominant (111), (100), (011), and (110) Facets. A Combined Experimental and Theoretical Study

Time‐resolved composite nature of the self‐trapped exciton luminescence in PbMoO₄

Contact Info

Product

Resources

About

Exciton transition and electronic structure of PbMoO4 crystals studied by polarized light

Abstract: Received ZZZ, revised ZZZ, accepted ZZZ Published online ZZZ (Dates will be provided by the publisher.)PACS 71.35.Cc, 78.20.Ci, 71.35.Aa,

Cited by 22 publications

References 32 publications

Electronic structure and luminescence mechanisms in ZnMoO4crystals

Electronic structure and luminescence mechanisms in ZnMoO4crystals

Toward Understanding the Photocatalytic Activity of PbMoO4Powders with Predominant (111), (100), (011), and (110) Facets. A Combined Experimental and Theoretical Study

Time‐resolved composite nature of the self‐trapped exciton luminescence in PbMoO4

Contact Info

Product

Resources

About

Exciton transition and electronic structure of PbMoO₄ crystals studied by polarized light

Electronic structure and luminescence mechanisms in ZnMoO₄crystals

Electronic structure and luminescence mechanisms in ZnMoO₄crystals

Toward Understanding the Photocatalytic Activity of PbMoO₄Powders with Predominant (111), (100), (011), and (110) Facets. A Combined Experimental and Theoretical Study

Time‐resolved composite nature of the self‐trapped exciton luminescence in PbMoO₄