Measurements of ultrafast scintillation rise times: evidence of energy transfer mechanisms

Weber, M.; Derenzo, Stephen E.; Moses, W.W.

doi:10.1016/s0022-2313(99)00430-5

Cited by 39 publications

(18 citation statements)

References 4 publications

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“…Wide-bandgap insulating materials doped with Ce 3+ ions attract significant attention [6][7][8][9][10] mostly because they may serve as efficient scintillators and phosphors. For both of these applications, energy transfers from the primary host excitations to Ce 3+ acceptor ions are of great importance.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanisms of energy transfer from the host excitations to activator ions under VUV excitation are most important when phosphor materials are considered. Direct time-resolved studies of the dynamics of exciton-to-acceptor energy transfer are rare; the nanosecond dynamics of such transfer was observed in LuAlO 3 :Ce 3+ [6] and Y 3 Al 5 O 12 :Ce 3+ [9].…”

Section: Introductionmentioning

confidence: 99%

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Energy transfer from the host excitations to Ce3+ ions in scandium borate

Feofilov¹,

Zhou

Jeong

et al. 2007

Journal of Luminescence

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy transfer from the host excitations to Ce3+ ions in scandium borate

Feofilov¹,

Zhou

Jeong

et al. 2007

Journal of Luminescence

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“…The quantum efficiency of the multi-alkali (S20) photocathode material has a maximum between 440 and 470 nm of approximately 8.5%. The X-ray tube used here is an improved version with a voltage of 40 kV, increasing both the photon number as well as the mean photon energy (13-14 keV), compared to the previous model with 30 kV [5], [15]. The use of an aluminium filter can increase the mean X-ray energy to approximately 20-22 keV.…”

Section: A Experimental Set-upmentioning

confidence: 99%

Instrumentation for X-ray Excited and Laser Induced Fluorescence Lifetime Spectroscopy Using Two-Dimensional Photon Counting

Pook

Fruhner

Franzl³

et al. 2012

IEEE Trans. Nucl. Sci.

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A table top picosecond pulsed X-ray and laser induced fluorescence spectrometer using two-dimensional photon counting is presented. With this streak camera system it is possible to measure fluorescence events in a wavelength range from 200-850 nm. Measuring results are full time resolved fluorescence spectra with a temporal resolution up to 20 ps after deconvolution. The instrumental response function (IRF) of the system is around 60 ps for laser excitation and 80 ps for X-ray excitation. For a performance test well known inorganic (CsI, CsI:Tl) and organic scintillators (anthracene) as well as rhodamine 6G for laser induced fluorescence are measured and evaluated. The easily manageable system shows satisfying results in agreement with literature values.

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“…Rise-time studies on such short timescale have been reported for undoped materials like the alkali halides in which the formation of self-trapped excitons (STEs) is a dominant process. [1][2][3] Although Moses and Weber 5,6 studied rise-times in wide bandgap Ce 3þ doped scintillator materials under pulsed x-ray excitation, host-to-luminescence center rise-time studies using selective laser excitation at bandgap energies on TM or RE ion doped materials have hardly been reported.…”

Section: Introductionmentioning

confidence: 99%

Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

Louwers¹,

Takizawa²,

Hidaka³

et al. 2012

Journal of Applied Physics

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A Eu 2þ concentration and temperature dependent energy transfer study from the host lattice to Eu 2þ luminescence centers in Ca (1-x) Eu x Ga 2 S 4 (x ¼ 0.001 to 0.05) was performed with a special streak camera that combines the high timing resolution of a conventional synchroscan operation (<2 ps) with the ability to study long lived states (10 ns À 1 ms) typical for rare earth and transition metal ions. Two transfer mechanisms from the CaGa 2 S 4 host lattice to the Eu 2þ ions were identified. A fast transfer process (<4 ps) is interpreted as sequential hole-electron capture by the Eu 2þ ions, and slower process (>1 ns) is interpreted as the sequential capture of a hole and an electron by Eu 2þ but with the electron first entering an intermediate state trapped near Eu 3þ . Energy transfer via a self-trapped excitonic (STE) state is unlikely because of the absence of an anti-correlation between the STE decay-time and the Eu 2þ rise-time as well as between the STE emission intensity and the Eu 2þ intensity. All rise-time spectra were successfully fitted with a model representing the above transfer mechanisms. V C 2012 American Institute of Physics.

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Measurements of ultrafast scintillation rise times: evidence of energy transfer mechanisms

Cited by 39 publications

References 4 publications

Energy transfer from the host excitations to Ce3+ ions in scandium borate

Energy transfer from the host excitations to Ce3+ ions in scandium borate

Instrumentation for X-ray Excited and Laser Induced Fluorescence Lifetime Spectroscopy Using Two-Dimensional Photon Counting

Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

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