Sr1.97SiO4∶Eu2+0.03 phosphors were synthesized through the solid-state reaction technique. The X-ray diffraction shows that the phase of the phosphors is orthorhombic α′-Sr2SiO4. The produced phosphors show one intense emission band located at 490 nm. The phosphor shows a long afterglow properties excited by the sunlight. The decay characteristics show that the phosphors consist of a quick decay process and a slow decay process. The experimental results demonstrate that the thermoluminescence (TL) curves of the samples containing four peaks, located at 346, 420, 457 and 552 K, respectively. Meanwhile, the different peaks show the different decay characteristics, and the electron transfer between the trap levels was measured.