Green long persistence luminescent material and preparation method thereof

The invention discloses a green long persistence luminescent material and preparation method thereof. The luminescent material has a chemical expression of Ca2Zn1-y-0.5zMzSi2-0.75xAlxO7-y, wherein x ranges from 0.05 to 0.15, y ranges from 0.01 to 0.10, z ranges from 0.01 to 0.10, and M is Li, Na or K. The method comprises the steps of taking zinc-calcium silicate as a host material, modifying thehost material simultaneously by introducing Al and alkali metal ions, and adjusting a preparation process through a step-by-step calcination method to obtain the luminescent material which is stable in chemical property and excellent in luminescence property. The prepared material has a completely defective luminescence center while not needing rare earth ions or transition metal ions, is good instability, low in cost and good in luminescence property, and can give off green light for more than 10 hours in darkness after irradiated by lamplight for 15 minutes. 本发明公开了种绿色长余辉发光材料及其制备方法。该发光材料的化学表达式为CaZnMSiAlO，其中x=0.05~0.1