Crystal growth, luminescence and scintillation properties of Eu2+:CeBr3 crystals. (May 2016)

• Record Type: Journal Article
• Authors: Pan, Shangke; Wang, QingQing; Li, Huanying; Chen, Xiaofeng; Ren, Guohao; Sun, Xilei
• Is Part Of: Radiation measurements. Volume 88(2016:May)
• Page Start: 7
• Page End: 13
• Publication Date: 2016-05
• Subjects: Crystal growth -- Scintillation crystal -- Energy transfer -- CeBr3 -- Vertical Bridgman method; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2016.03.001
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: Eu 2+ :CeBr3 crystals were grown by vertical Bridgman growth method and slight aliovalent doping of Eu 2+ in the CeBr3 crystal did not change the crystal structure. The X-ray stimulated luminescence, photoluminescence, decay kinetics and scintillation properties were investigated at room temperature. The X-ray stimulated luminescence spectra exhibited wide broad emission bands from 3.54 eV to 2.95 eV in the Eu 2+ :CeBr3 crystal with high content of 620 ppm of Eu 2+, which were the overlap of the emission bands ascribed to 5d → 4f transition of Ce 3+ and 4f 6 5 d 1 → 4f 7 transition of Eu 2+, respectively. When the content of Eu 2+ was decreased to 70 ppm, another emission band centered at 2.29 eV was observed. The photoluminescence spectra showed the energy transfer from Ce 3+ to Eu 2+ . This decreased the Ce 3+ emission intensity but enhanced the Eu 2+ emission intensity. The photoluminescence decay time of Ce 3+ emission decreased from 14 ns to 10 ns when the content of Eu 2+ increased from 70 ppm to 620 ppm. The decay time of the emission of 525 nm did not change with the excitation wavelength and Eu 2+ content, which could be assigned to the excitons that were bound on Eu 2+ related centers. The light output of the Eu:CeBr3 crystal under the excitation of 241 Am radioactive source was less than 20.2% of Tl:NaI crystal. Highlights: Eu 2+ :CeBr3 crystals were grown by vertical Bridgman growth method. Energy transfer from Ce 3+ to Eu 2+ was investigated. The decay time of Ce 3+ emission changed with the Eu 2+ content. The decay time of Eu 2+ emission consisted of two components. The light output of Eu:CeBr3 crystal was less than 20.2% of Tl:NaI crystal.