Studies of the luminescence efficiency of tungstate and molybdate phosphors as a function of temperature and high pressure

Tyner, C.E.

doi:10.1063/1.435387

Cited by 48 publications

(13 citation statements)

References 17 publications

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“…Concerning the decay of the host crystal, it is known from previous reports that the decay time of CaWO 4 at room temperature and ambient pressure is only 9 ms, 38 the emission of this unit being significantly affected by non-radiative losses ascribed to energy migration and internal thermal quenching. 41 In CaWO 4 :Tb 3+ , the decay time of the host becomes 4.5 ms in consequence of the host to Tb 3+ energy transfer process, whose efficiency, Z ET , estimated using the equation: The Tb 3+ decays also show complex evolution, especially across the phase transition.…”

Section: Resultsmentioning

confidence: 99%

“…It can be accounted for by an increase of the force constant of the (Tb 3+ -W 6+ ) CT state by the action of pressure, 38 especially across the scheelite to fergusonite phase transition. This is depicted schematically in the configuration diagrams of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The decay curves were found to be single exponential for all pressures. 38 Applying pressure on CaWO 4 :Tb 3+ and CaWO 4 :Pr 3+ induces in both cases a downshift of the CT state relative to the Pr 3+ (or Tb 3+ ) 4f states. The result is a quenching of the 3 P 0 (at 105 kbar) and 1 D 2 (at 315 kbar) emissions in CaWO 4 :Pr 3+ and of the 5 D 3 (at 70 kbar) and 5 D 4 (at 190 kbar) emissions in CaWO 4 :Tb 3+ .…”

Section: Introductionmentioning

confidence: 96%

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Energy levels in CaWO₄:Tb³⁺at high pressure

Mahlik

Cavalli

Amer

et al. 2015

Phys. Chem. Chem. Phys.

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The luminescence properties of Tb(3+) in CaWO4 crystals are investigated under a hydrostatic pressure of up to 200 kbar, i.e. across scheelite-to-fergusonite phase transition. It is shown that the typical blue ((5)D3) and green ((5)D4) emissions in this material are progressively quenched at room temperature as pressure is increased. This quenching is caused by a downshift of the charge transfer (or impurity trapped exciton) state that is formed between Tb(3+) and nearby W(6+) cations in conjunction with a pressure-induced increase of the lattice relaxation experienced by this excited state. An empirical model is introduced to calculate the evolution of the (Tb(3+)-W(6+)) charge transfer energy with pressure. Combined with the pressure dependence of the energy bandgap in CaWO4, the model allows locating the 4f levels of Tb(3+) relative to the fundamental host lattice for any pressure in the range 0-200 kbar.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Energy levels in CaWO₄:Tb³⁺at high pressure

Mahlik

Cavalli

Amer

et al. 2015

Phys. Chem. Chem. Phys.

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“…CaWO 4 , ZnWO 4 and CaMoO 4 are currently materials of first choice for cryogenic dark matter search. While CaWO 4 and ZnWO 4 have a long history of practical application as detectors of ionising radiation that resulted in a significant amount of relevant information gathered by generations of scientists [40,41,42], the scintillation properties of CaMoO 4 became of interest only recently [27,43]. Nonetheless the spectroscopic properties of these crystals have been studied for decades [44, 45, 46, 47.] and recently we investigated them extensively [48,49].…”

Section: Luminescence Spectramentioning

confidence: 99%

Performance of scintillation materials at cryogenic temperatures

Mikhailik

Kraus

2010

phys. stat. sol. (b)

174

111

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An increasing number of applications of scintillators at low temperatures, particularly in cryogenic experiments searching for rare events, has motivated the investigation of scintillation properties of materials over a wide temperature range. This paper provides an overview of the latest results on the study of luminescence, absorption and scintillation properties of materials selected for rare event searches so far. These include CaWO4, ZnWO4, CdWO4, MgWO4, CaMoO4, CdMoO4, Bi4Ge3O12, CaF2, MgF2, ZnSe and AL2O3-Ti. We discuss the progress achieved in research and development of these scintillators, both in material preparation and in the understanding of scintillation mechanisms, as well as the underlying physics. To understand the origin of the performance limitation of self-activated scintillators we employed a semi-empirical model of conversion of high energy radiation into light and made appropriate provision for effects of temperature and energy transfer. We conclude that the low-temperature value of the light yield of some modern scintillators, namely CaWO4, CdWO4 and Bi4Ge3O12, is close to the theoretical limit. Finally, we discuss the advantages and limitations of different materials with emphasis on their application as cryogenic phonon-scintillation detectors (CPSD) in rare event search experiments

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“…Therefore the luminescence properties of the crystals under interest have been investigated most extensively. The earlier studies have been done mainly using ultraviolet, x-ray or particle excitation [25,26,[30][31][32][33][34][35][36][37]. The results of investigations using timeresolved techniques under excitation with VUV synchrotron radiation [38][39][40], pulsed UV [41,42] and x-ray sources [43,44] have been published recently.…”

Section: Tungstates (Cawo 4 and Znwo 4 )mentioning

confidence: 99%

Cryogenic scintillators in searches for extremely rare events

Mikhailik¹,

Kraus²

2006

J. Phys. D: Appl. Phys.

125

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Inorganic scintillators are important elements of a new type of cryogenic phonon scintillation detector (CPSD) being developed for single particle detection. These detectors, exhibiting superior energy resolution and the ability to identify the type of interaction in an event, are considered to be the next generation of instrumentation in the search for extremely rare events. This paper presents the latest results of our research on cryogenic scintillators for CPSD applications in the search for dark matter. The paper gives a description of the concept of direct dark matter detection and the operation principles of CPSD, discusses the major material requirements and summarizes the results of investigations over a wide temperature range of the luminescence and scintillation properties of tungstates (CaWO 4 and ZnWO 4 ), molybdates (CaMoO 4 , MgMoO 4 and CdMoO 4 ) and Ti-doped Al 2 O 3 .

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Studies of the luminescence efficiency of tungstate and molybdate phosphors as a function of temperature and high pressure

Cited by 48 publications

References 17 publications

Energy levels in CaWO₄:Tb³⁺at high pressure

Energy levels in CaWO₄:Tb³⁺at high pressure

Performance of scintillation materials at cryogenic temperatures

Cryogenic scintillators in searches for extremely rare events

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Studies of the luminescence efficiency of tungstate and molybdate phosphors as a function of temperature and high pressure

Cited by 48 publications

References 17 publications

Energy levels in CaWO4:Tb3+at high pressure

Energy levels in CaWO4:Tb3+at high pressure

Performance of scintillation materials at cryogenic temperatures

Cryogenic scintillators in searches for extremely rare events

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Product

Resources

About

Energy levels in CaWO₄:Tb³⁺at high pressure

Energy levels in CaWO₄:Tb³⁺at high pressure