The luminescent properties of long afterglow phosphors: Ca2MgSi2O7: Eu2+, Tm3+ with different preparation temperatures

摘要

Ca2MgSi2O7: Eu2+, Tm3+ phosphor is prepared by solid state reaction. Structure, emission wavelength and decay time are detected, which show that Ca2MgSi2O7 phase (up to 1300 degrees C) and mixture phases (below the 1300 degrees C) are respectively generated. The emission wavelength of two phases are 521 nm (green) and 474 nm (blue), which are viewed as the typical emission of Eu2+ ascribed to the 4f-5d transitions. Tm3+ acts as trap centers and causes long afterglow characteristics of phosphors, which is vanished up to 1300 degrees C. The results show that the pure luminescent material Ca2MgSi2O7: Eu2+, Tm3+ has been achieved while the temperature is higher than 1300 degrees C. The decay curves indicate that five luminescent samples have long-lasting properties. The higher sintering temperatures of samples will keep long time at the high luminescent intensity area and the higher temperature has the stronger luminescent properties.