Core–valence luminescence in scintillators |
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Authors: | Piotr A. Rodnyi |
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Affiliation: | Department of Experimental Physics, St. Petersburg State Polytechnical University, Polytekhnicheskaya 29, 195251, St. Petersburg, Russian Federation |
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Abstract: | The state of the art of core–valence luminescence (CVL) in a number of halides (BaF2, CsCl, LiBaF3, etc.) is analysed. The following items are discussed: common properties of CVL, a suppression of slow emission component in BaF2, an effect of secondary excitation density on intensity and decay profile of the emission, a neutron–gamma discrimination, spectrum simulations, impurity-associated CVL, an origin of slow- and long-wavelength CVL components, a lattice relaxation, vibrations of lattice environment and phonon broadening of the emission bands. Experimental results on impurity-associated CVL of Rb1−xCsxBr (x<0.2) are presented and discussed. It is shown that the impurity-associated luminescence gives us a convenient way for the improvement of light output and variation of the emission wavelength of the scintillators. |
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Keywords: | Core–valence luminescence Secondary excitation density Phonon broadening Neutron–gamma discrimination |
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