Decay kinetics of the green emission in PbWO4:Mo

Mihóková, E.; Nikl, M.; Boháček, P.; Babin, V.; Krasnikov, А.; Stolovich, A.; Zazubovich, S.; Vedda, A.; Martini, M.; Grabowski, Theodore

doi:10.1016/s0022-2313(02)00614-2

Cited by 22 publications

(26 citation statements)

References 18 publications

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“…From the I(T) dependence of the G(I) emission, the value E q = 0.24 ± 0.01 eV was obtained. Close values of E a and E q confirm the conclusion [18] that the disintegration of the MoO 4 2-state is responsible for thermal quenching of the G(I) emission.…”

Section: Processes Responsible For Thermal Quenching Of Luminescencesupporting

confidence: 76%

“…In [18], E a = 0.26 eV was obtained for the TSL peak creation in the same crystal at E irr = 3.75 eV. The value of E a = 0.215 eV obtained here should be more correct as it is calculated with the use of many more experimental points (obtained for four E irr values from the 3.9-3.6 eV energy range and four to six T irr at each E irr ).…”

Section: Activation Energies For the Tsl Peak Creationmentioning

confidence: 50%

“…The PbWO 4 :Mo, Ce crystal was grown in the Czech Republic by the Czochralski method from 5N raw materials in a platinum crucible and under air atmosphere using the first crystallization; see also [18]. The concentration of Mo 6+ in the sample was 800 ppm, and the concentration of Ce 3+ was around 60 ppm determined by inductively coupled plasma chemical analysis.…”

Section: Methodsmentioning

confidence: 99%

“…The photo-thermally stimulated disintegration of the exciton and Mo-related states with subsequent release of free charge carriers and their band-to-band non-radiative recombination was considered in [18] as the only reason for thermal quenching of the blue and the green emission, respectively. In this case, the E q values, obtained from the temperature dependences of the corresponding emission intensity I(T) and decay time τ(T), should be equal to the E a values for the STE and the defect-related state disintegration.…”

Section: Processes Responsible For Thermal Quenching Of Luminescencementioning

confidence: 99%

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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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Section: Processes Responsible For Thermal Quenching Of Luminescencesupporting

confidence: 76%

Section: Activation Energies For the Tsl Peak Creationmentioning

confidence: 50%

Section: Methodsmentioning

confidence: 99%

Section: Processes Responsible For Thermal Quenching Of Luminescencementioning

confidence: 99%

See 2 more Smart Citations

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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“…Decay kinetics of the B and G(I) emission was investigated in [4,[6][7][8][9]. Around 150 K, the decay times are of the order of 1 µs, and at RT, 2-4 ns.…”

mentioning

confidence: 99%

Tunneling recombination processes in PbWO₄ crystals

Fabeni¹,

Kiisk

Krasnikov

et al. 2007

Phys. Status Solidi (c)

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Time-resolved emission and excitation spectra and luminescence decay kinetics were studied at 160-300 K for undoped and Mo-doped PbWO 4 crystals under XeCl (4.02 eV), N 2 (3.67 eV) and KrF (5.0 eV) pulsed excimer laser excitation. The G(II) emission was found to be responsible for the slow (µs-ms) luminescence decay. Under excitation or after irradiation in the exciton region (E exc = 4.02 eV), this emission accompanies the monomolecular tunneling recombination in genetic pairs of electron and hole centers produced at the photo-thermally stimulated decay of localized excitons, which occurs without release of free charge carriers. Under excitation or after irradiation in the host lattice (E exc = 5.0 eV) and defectrelated (E exc = 3.67 eV) regions, the bimolecular tunneling recombination takes place in chaotic pairs of the electron and hole centers created at the trapping of optically released free charge carriers.

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Photoelectric properties of lead tungstate crystals

Gamernyk

Garapyn

Khapko

et al. 2004

phys. stat. sol. (a)

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Room temperature photoconductivity measurements were performed for PbWO4 crystals grown under different conditions. In the near‐band‐edge region three bands of photoionization absorption (310, 330 and 338 nm) were detected. The intensity of these bands depends on crystal perfection and quality. The value of a photocurrent under excitation within the 330 nm band depends on preceding irradiation of a PbWO4 crystal by a laser beam (λex = 337 nm). The nature of defect centers related to the photoionization absorption bands is discussed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Decay kinetics of the green emission in PbWO4:Mo

Cited by 22 publications

References 18 publications

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

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

Tunneling recombination processes in PbWO₄ crystals

Photoelectric properties of lead tungstate crystals

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Decay kinetics of the green emission in PbWO4:Mo

Cited by 22 publications

References 18 publications

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

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

Tunneling recombination processes in PbWO4 crystals

Photoelectric properties of lead tungstate crystals

Contact Info

Product

Resources

About

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

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

Tunneling recombination processes in PbWO₄ crystals