Temperature response and thermoluminescence of SrI2:Eu2+ single crystals

Abstract

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