Optical properties of Eu-activated calcium aluminosilicates synthesized in different atmospheres

The optical properties of Eu-activated CaAl2Si2O8 appear to be totally dependent on the atmosphere during the synthesis processing. Compared with oxidizing/reducing-sintered samples, a significant enhancement in both the photoluminescence and afterglow for the vacuum-sintered sample is observed. The deficiency of energy transfer among the different emission centers is the prevailing contribution to the highest photoluminescence intensity of the vacuum-sintered sample. A distinction in afterglow characteristics of CaAl2Si2O8:Eu prepared in different atmosphere is suggested to be mainly due to the distribution of different trap depths at three types of emission centers.

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► Optical properties of CaAl2Si2O8:Eu prepared in different atmosphere were different.
► Vacuum sintered CaAl2Si2O8:Eu exhibited enhanced photoluminescence intensity.
► The afterglow properties were improved of vacuum sintered CaAl2Si2O8:Eu.