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Emission and excitation spectra of , , 2%Dy (solid lines, , 0.1, 0.5, 1, 2, and 3; ), and , (dashed lines, ).
Emission spectra of , , and (, 0.5, 1, 2, 3, 4, and 5) under excitation. The intensities of the blue bands at are normalized.
Calculated and experimental ratios of the red emission to the blue at for different concentrations. The ratios are scaled to the maximum.
Time decay curves of the phosphorescence at 490 and of , , after irradiation with xenon lamp for . The phosphorescence spectrum is presented in the inset.
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