Charge carrier and exciton dynamics in LaBr{sub 3}:Ce{sup 3+} scintillators: Experiment and model

doi:10.1103/PHYSREVB.75.184302

Title: Charge carrier and exciton dynamics in LaBr{sub 3}:Ce{sup 3+} scintillators: Experiment and model

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Abstract

The scintillation yield and decay time of LaBr{sub 3} doped with 0.2%, 0.5%, and 5% cerium were studied between 80 K and 600 K. LaBr{sub 3}:5%Ce{sup 3+} on a photomultiplier tube shows at 300 K a very high scintillation yield of 22 800 photoelectrons per MeV (64 000 photons per MeV) with a decay time of 16 ns. At 600 K the yield decreases by {approx_equal}15%. The scintillation yield of LaBr{sub 3}:0.2%Ce{sup 3+} is 19 800 photoelectrons per MeV (56 000 photons per MeV) at 300 K with a decrease by {approx_equal}50% at 600 K and a main scintillation decay time around 30 ns. The appearance of slow components in the Ce emission indicates a relatively slow energy transfer from the host crystal to Ce. The presence or absence of slow components depends on both concentration and temperature. The results are analyzed and interpreted with a model that comprises prompt charge carrier trapping by Ce and delayed excitation of Ce by means of thermally activated transport of self-trapped exciton defects. The results of the study provide detailed information on the scintillation mechanism. Besides presenting experimental data, the different energy transfer processes are quantified.

Authors:

Bizarri, G.; Dorenbos, P. ^[1]

Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629JB Delft (Netherlands)

Publication Date:: Tue May 01 00:00:00 EDT 2007

OSTI Identifier:: 20951413

Resource Type:: Journal Article

Resource Relation:: Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevB.75.184302; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CERIUM; CERIUM IONS; CHARGE CARRIERS; DOPED MATERIALS; ENERGY TRANSFER; EXCITONS; EXPERIMENTAL DATA; GAMMA DETECTION; LANTHANUM BROMIDES; PHOTOMULTIPLIERS; PHOTONS; SCINTILLATIONS; SOLID SCINTILLATION DETECTORS; TEMPERATURE DEPENDENCE; YIELDS

Citation Formats


                    Bizarri, G., and Dorenbos, P. Charge carrier and exciton dynamics in LaBr{sub 3}:Ce{sup 3+} scintillators: Experiment and model.  United States: N. p., 2007. 
        Web.  doi:10.1103/PHYSREVB.75.184302.

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                    Bizarri, G., & Dorenbos, P. Charge carrier and exciton dynamics in LaBr{sub 3}:Ce{sup 3+} scintillators: Experiment and model.  United States.  doi:10.1103/PHYSREVB.75.184302.

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                    Bizarri, G., and Dorenbos, P. Tue .  
        "Charge carrier and exciton dynamics in LaBr{sub 3}:Ce{sup 3+} scintillators: Experiment and model".  United States.  
        doi:10.1103/PHYSREVB.75.184302.

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@article{osti_20951413,

  title        = {Charge carrier and exciton dynamics in LaBr{sub 3}:Ce{sup 3+} scintillators: Experiment and model},

  author       = {Bizarri, G. and Dorenbos, P.},

  abstractNote = {The scintillation yield and decay time of LaBr{sub 3} doped with 0.2%, 0.5%, and 5% cerium were studied between 80 K and 600 K. LaBr{sub 3}:5%Ce{sup 3+} on a photomultiplier tube shows at 300 K a very high scintillation yield of 22 800 photoelectrons per MeV (64 000 photons per MeV) with a decay time of 16 ns. At 600 K the yield decreases by {approx_equal}15%. The scintillation yield of LaBr{sub 3}:0.2%Ce{sup 3+} is 19 800 photoelectrons per MeV (56 000 photons per MeV) at 300 K with a decrease by {approx_equal}50% at 600 K and a main scintillation decay time around 30 ns. The appearance of slow components in the Ce emission indicates a relatively slow energy transfer from the host crystal to Ce. The presence or absence of slow components depends on both concentration and temperature. The results are analyzed and interpreted with a model that comprises prompt charge carrier trapping by Ce and delayed excitation of Ce by means of thermally activated transport of self-trapped exciton defects. The results of the study provide detailed information on the scintillation mechanism. Besides presenting experimental data, the different energy transfer processes are quantified.},

  doi          = {10.1103/PHYSREVB.75.184302},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 18,

  volume       = 75,

  place        = {United States},

  year         = {Tue May 01 00:00:00 EDT 2007},

  month        = {Tue May 01 00:00:00 EDT 2007}

}

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DOI: 10.1103/PHYSREVB.75.184302

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