Influence of Mo Impurity on the Spectroscopic and Scintillation Properties of PbWO4 Crystals

Böhm, M.; Borsevich, A. E.; Drobychev, G.; Hofstaetter, A.; Kondratiev, O. V.; Korzhik, M.; Luh, M.; Meyer, B. K.; Peigneux, J.P.; Scharmann, A.

doi:10.1002/(sici)1521-396x(199805)167:1<243::aid-pssa243>3.0.co;2-#

Cited by 37 publications

(17 citation statements)

References 14 publications

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“…2͑b͒ shows that ͑MoO 4 ͒ 3− centers are created already at E Ϸ 3.4 eV, well below the excitation threshold of the exciton ͑blue͒ luminescence, which is around 3.9 eV at 150-200 K. 4 On the other hand, the energy region 3.4-3.8 eV exactly corresponds to the excitation spectrum of the green luminescence due to Mo ions in the lattice. 5,16 One can thus suppose that under UV irradiation a hole leaves the ͑MoO 4 ͒ 2− complex above 150 K and an additional electron occupies the d z 2 orbital of the Mo 5+ ion which is regularly arranged by four oxygens in a tetrahedral symmetry ͑see the sketch in Fig. 3͒.…”

Section: Resultsmentioning

confidence: 99%

Electron capture inPbWO4: Mo andPbWO4:Mo,La single crystals: ESR and TSL study

et al. 2005

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Electron spin resonance ͑ESR͒, thermally stimulated luminescence ͑TSL͒ and electrical conductivity measurements were performed on Mo-and ͑Mo,La͒-doped PbWO 4 crystals in order to understand electron capture processes involving the Mo-based defects. A defect consisting of an electron localized around the ͑MoO 4 ͒ 2− complex ͑͑MoO 4 ͒ 3− center͒ was evidenced by ESR after UV illumination and studied in detail; the thermally activated detrapping of electrons from ͑MoO 4 ͒ 3− centers in the 200-250 K temperature region was described also by TSL measurements. Finally, in La-codoped samples, free electrons in the conduction band were found by both ESR and electrical conductivity experiments, unveiling a donor character of La 3+ impurity in the PWO lattice. Microscopical aspects of the energy storage processes and radiation resistance of the material are discussed.

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Section: Resultsmentioning

confidence: 99%

Electron capture inPbWO4: Mo andPbWO4:Mo,La single crystals: ESR and TSL study

et al. 2005

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“…This band is undoubtedly ascribed to the excitons localized at (MoO 4 ) 2− centers in PWO. 35,36) It is interesting to note that the peak position of the band IV in undoped PWO clearly differs from that in Mo-doped PWO. Such a difference distinctly rules out the proposal (iv).…”

Section: Discussionmentioning

confidence: 99%

Time-resolved luminescence from Jahn-Teller split states of self-trapped excitons inPbWO4

Itoh

Sakurai

2006

Phys. Rev. B

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“…The green emission of the first type observed at low temperatures is denoted as the G(I) emission. In the Mo-doped crystals this emission was ascribed to the unperturbed MoO 4 2-groups [6][7][8][9] or to the MoO 4 2-groups perturbed by various intrinsic defects [10]. In undoped crystals, the G(I) emission was ascribed to the excitons of the type of WO 4 2-localized near various intrinsic defects [11] or in the lead-deficient crystal regions [12].…”

Section: Introductionmentioning

confidence: 99%

Localized excitons and defects in PbWO₄ single crystals: a luminescence and photo‐thermally stimulated disintegration study

Krasnikov

Nikl

Zazubovich³

2006

Physica Status Solidi (b)

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PACS 71. 78.55.Hx, 78.60.Kn Luminescence from the exciton-and defect-related states and photo-thermally stimulated disintegration of these states under selective UV irradiation were studied in the PbWO 4 : Mo, Ce crystal and compared with the characteristics of other undoped and doped PbWO 4 crystals of different origin. For the first time, various localized exciton states were identified and their decay into stable defects was found. Different positions, halfwidths and temperature dependences were observed for the blue emission spectrum in different PbWO 4 crystals and explained by the presence of strongly overlapping emission bands of the WO 4 2--type self-trapped and localized excitons. Binding energies of the self-trapped and localized exciton states were calculated. The dominant thermally stimulated luminescence peaks, created in the PbWO 4 : Mo, Ce crystal by the UV radiation, are located at 110, 202 and 247 K. The related trap depths were calculated using the initial rise method. It was concluded that under irradiation in the exciton absorption region, defects are mainly created due to the disintegration of the localized exciton states, which occurs without release of free charge carriers.

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Influence of Mo Impurity on the Spectroscopic and Scintillation Properties of PbWO4 Crystals

Cited by 37 publications

References 14 publications

Electron capture inPbWO4: Mo andPbWO4:Mo,La single crystals: ESR and TSL study

Electron capture inPbWO4: Mo andPbWO4:Mo,La single crystals: ESR and TSL study

Time-resolved luminescence from Jahn-Teller split states of self-trapped excitons inPbWO4

Localized excitons and defects in PbWO₄ single crystals: a luminescence and photo‐thermally stimulated disintegration study

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Influence of Mo Impurity on the Spectroscopic and Scintillation Properties of PbWO4 Crystals

Cited by 37 publications

References 14 publications

Electron capture inPbWO4: Mo andPbWO4:Mo,La single crystals: ESR and TSL study

Electron capture inPbWO4: Mo andPbWO4:Mo,La single crystals: ESR and TSL study

Time-resolved luminescence from Jahn-Teller split states of self-trapped excitons inPbWO4

Localized excitons and defects in PbWO4 single crystals: a luminescence and photo‐thermally stimulated disintegration study

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Localized excitons and defects in PbWO₄ single crystals: a luminescence and photo‐thermally stimulated disintegration study