Evaluation and Prediction of Photoluminescence Performance on the Blue Phosphor CaMgSi2O6:Eu by Analysis of the Trap

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In this study, we investigated an origin of low reproducibility of blue phosphor (CaMgSi2O6:Eu) by means of XRD, SEM, cathodoluminescence, photoluminescence, and thermoluminescence. There were no changes in the crystal structure, particle size, surface morphology, and cathodoluminscence property. On the other hand, it was seen that an increase in photoluminescence intensity induced a corresponding decrease in peak area of thermoluminescence spectrum, and the photoluminescence intensity was almost linearly proportional to the peak area of thermoluminescence spectrum. In addition, similar relationship was also found in another blue phosphor Sr3MgSi2O8:Eu. It is suggested that the low reproducibility of the photoluminescence intensity may be due to the change of the thermoluminescence spectra. Thus, by controlling the concentration of traps in the host crystal of the phosphor, it is possible to predict the potential performance of its photoluminescence.