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Single crystal of strontium iodide doped with 1% europium (SrI2: 1% Eu2+) was grown by Vertical Gradient Freeze technique. Temperature response and thermoluminescence glow curves of SrI2: 1% Eu2+ were studied. UV excitation spectrum of SrI2: 1%Eu2+ at 298 K shows a broad excitation peak at 367 nm. At ~24 K, additional excitation peaks appear in the range of 265 nm and 285 nm. UV excited emission spectra were measured as a function of temperature. Results indicates the thermal quenching of Eu emission starts from ~400 K. The thermoluminescence curve indicates the elimination of the charge trap at 50 K may significantly expedite the scintillation process thus decrease the scintillation decay time of SrI2:Eu.
Date of Conference: Oct. 30 2010-Nov. 6 2010