Rare earth activated alkaline earth metal aluminate luminescent material is a rare earth Eu especially on the active element , an alkaline earth metal aluminate to a class of luminescent substrate material . Where Eu and Dy co-activated strontium aluminate SrO · nA12O3: Eu, Dy is a typical representative of the 20th century, it was developed in the glow in the dark pigments, a new class of luminescent material activated alkali earth aluminate luminescent materials are characterized from beginning high brightness, long afterglow time (> 12h), non-radioactive hazards, resistance to environmental erosion, known as the green energy-saving materials . In SrO · nA12O3: Eu, Dy emitting material , with the SrO/A12O3 ratio, the fluorescence wavelength and afterglow time is different , glow in the dark rock· A12O3: Eu, Dy, a yellow- green light after excitation , peak wavelength 520nm; 2SrO · 3A12O3: Eu, Dy, excited by blue-green light , the peak wavelength of 490nm. The afterglow time is longer than the latter the former, but the initial luminous intensity is the opposite .
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