Dependence of the efficiency of various emissions on excitation density in BaF2 crystals

Kirm, M.; Lushchik, A.; Lushchik, Ch.; Nepomnyashikh, A.I.; Savikhin, F.

doi:10.1016/s1350-4487(01)00044-0

Cited by 38 publications

(25 citation statements)

References 9 publications

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“…Time-resolved spectra and decay curves were recorded using synchrotron radiation at the SUPERLUMI station of HA-SYLAB at DESY (Hamburg, Germany) as described in paper (Kirm et al, 2001). Measurements were performed in the short time window (1-5 ns), in the long time window (55-80 ns), and in the time-integrated regime.…”

Section: Methodsmentioning

confidence: 99%

Vacuum ultraviolet 5d14f9-4f10 emission of Ho3+ ions in alkaline-earth fluorides

Раджабов

Nagirnyi

Nepomnyashchikh

2013

Radiation Measurements

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Time-resolved emission, excitation as well as emission decay curves of CaF 2 , SrF 2 , BaF 2 doped with HoF 3 were investigated. Most intensive emission bands near 168 nm, having long decay time, belong to spin-forbidden transitions from 5d 1 4f 9 high spin (HS) states to ground 5 I 8 states of Ho 3+ ions. Weak spin allowed 5d 1 4f 9 (LS)-4f 10 emission band at 158 nm was observed only in CaF 2 -Ho crystals. Spin allowed and spin-forbidden excitation bands were observed in all crystals near 166 and 155 nm respectively. Fast component of spin-forbidden emissions due to multiphonon relaxation to low-lying 4f 10 Ho 3+ level was observed for all crystals.

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Section: Methodsmentioning

confidence: 99%

Vacuum ultraviolet 5d14f9-4f10 emission of Ho3+ ions in alkaline-earth fluorides

Раджабов

Nagirnyi

Nepomnyashchikh

2013

Radiation Measurements

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“…In addition, emission and excitation measurements were carried out using a low-temperature luminescence setup SUPERLUMI designed for VUV spectral region, located in HASYLAB at DESY (Hamburg, Germany) [11]. Photons generated by a bending magnet of the storage ring DORIS (5-MHz repetition rate) are tunable in the energy 0018-9499/$25.00 © 2008 IEEE Fig.…”

Section: Methodsmentioning

confidence: 99%

Energy Dissipation in Impurity DopedAlkaline-Earth Fluorides

Раджабов

Kirm

Egranov

et al. 2008

IEEE Trans. Nucl. Sci.

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Abstract-Excitation spectra of CaF 2 , SrF 2 and BaF 2 crystals doped by CdF 2 , LaF 3 , YF 3 in vacuum ultraviolet region were investigated at liquid-helium temperature and at room temperature. Spectra of doped BaF 2 at low temperature and CaF 2 , SrF 2 at room temperature show significant decrease of excitation intensity against those in undoped crystals while the intensities in exciton regions remain nearly the same.The common reason of the suppression of exciton emission by impurity in alkaline-earth fluorides is unradiative electron-hole recombination on impurity sites.

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“…The pulse duration of SR is typically ~100 ps and the photon fluxes generated reach ~10 12 photons per second. These are sufficient for spectroscopic purposes, but not for direct observation of effects due to high density of electronic excitations reported for the irradiation by ion beams [2] or by pulsed nanosecond electron beams [3].The development of new generation VUV light sources with extremely high peak power and brilliance, based on the free electron laser (FEL) concept [4] as well as on principles of higher order harmonic generation (HHG) in a gas [5], has opened new possibilities in investigation of luminescence properties of solids [6,7]. Due to the ultra-short pulses such sources are perfect tools for studies of relaxation dynamics of electronic excitations and for investigation of interactions of matter with the intense light pulse itself [8].…”

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confidence: 99%

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confidence: 99%

“…The 48 eV photons penetrate into the crystal deep enough to decrease the role of surface losses, which contribute significantly to the non-radiative decay of electronic excitations at lower energies. Therefore, the main cause for such behaviour is the excitation density effects as discussed in [3] for cross-luminescence in BaF 2 where quenching starts on the formation of ∼10 18 elec- tron-hole pairs in 1cm 3 . The powerful FEL allows the direct study of high-density excitation effects in solids.…”

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confidence: 99%

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Time resolved luminescence of solids excited by femtosecond VUV pulses and synchrotron radiation

Kirm

Babin

Feldbach

et al. 2007

Phys. Status Solidi (c)

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Time-resolved luminescence spectroscopy has been widely used in studies of electronic excitations and their dynamics in insulators. Present paper discusses the potential of vacuum ultraviolet spectroscopy applied for wide band gap crystals using classical synchrotron radiation as well as more recently developed pulsed femtosecond short-wavelength light sources. Optical spectroscopy using novel free electron lasers and laser systems based on higher harmonic generation process allow detailed investigation of the interaction between electronic excitations and behaviour of solids under extreme radiation conditions. Significant changes in the quantum yield and emission decay kinetics as well as surface damage of single crystals were observed for CdWO 4 and CaWO 4 crystals studied in the temperature range of 8-300 K. However, in the range of excitation densities applied, up to~10 12 W/cm 2 , the nature of luminescence centres and their characteristic emission spectra remained similar to those observed at low excitation densities. Time-resolved luminescence spectroscopy has been widely used in studies of electronic excitations and their dynamics in insulators. Present paper discusses the potential of vacuum ultraviolet spectroscopy applied for wide band gap crystals using classical synchrotron radiation as well as more recently developed pulsed femtosecond short-wavelength light sources. Optical spectroscopy using novel free electron lasers and laser systems based on higher harmonic generation process allow detailed investigation of the interaction between electronic excitations and behaviour of solids under extreme radiation conditions. Significant changes in the quantum yield and emission decay kinetics as well as surface damage of single crystals were observed for CdWO 4 and CaWO 4 crystals studied in the temperature range of 8-300 K. However, in the range of excitation densities applied, up to ~10 12 W/cm 2 , the nature of luminescence centres and their characteristic emission spectra remained similar to those observed at low excitation densities. 1 Introduction Storage rings (synchrotrons) are well-established short-wavelength light sources, which are widely exploited for various spectroscopic techniques characterising structural properties as well as electronic excitations of various materials. Synchrotron radiation (SR) has played an important role in the development of luminescence spectroscopy and in the investigation of dynamical processes as reviewed recently by Zimmerer [1]. As a tuneable source, along with its inherent time resolution and high repetition rate (a few MHz) SR allows revealing complicated relaxation processes induced by vacuum ultraviolet (VUV) photons in wide gap materials. The pulse duration of SR is typically ~100 ps and the photon fluxes generated reach ~10 12 photons per second. These are sufficient for spectroscopic purposes, but not for direct observation of effects due to high density of electronic excitations reported for the irradiation by ion beams [2] or by pulsed nanosecond elect...

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Dependence of the efficiency of various emissions on excitation density in BaF2 crystals

Cited by 38 publications

References 9 publications

Vacuum ultraviolet 5d14f9-4f10 emission of Ho3+ ions in alkaline-earth fluorides

Vacuum ultraviolet 5d14f9-4f10 emission of Ho3+ ions in alkaline-earth fluorides

Energy Dissipation in Impurity DopedAlkaline-Earth Fluorides

Time resolved luminescence of solids excited by femtosecond VUV pulses and synchrotron radiation

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