Influence of Calcining Temperature on Photoluminescence and Triboluminescence of Europium-Doped Strontium Aluminate Particles Prepared by Sol-Gel Process

摘要

On the basis of a new modified base-catalyzed sol-gel process and a careful investigation in the structure, this study systematically discussed the effects of the calcining temperature on the microstructure and luminescent properties of europium-doped strontium aluminates (SAO-E). A phase transformation from Sr_3Al_2O_6 to SrAl_2O_4 is found with increasing calcining temperature. The SAO-E sample calcined at 1400 ℃ for 2 h possesses a SrAl_2O_4 single monoclinic phase (space group P2_1). The light emission transition of SAO-E particles at low calcining temperature originated from both Eu~(2+) and Eu~(3+) ions where the trivalent europium ions were proved to be incorporated in the SrAl_2O_4 phase, which gradually transformed into the divalent ions with increasing calcining temperature. The strong photoluminescence and triboluminescence were obtained without luminance temperature-degradation in this single monoclinic SrAl_2O_4 phase.