| abstract |
The invention belongs to the field of light conversion agents and light conversion films. The long afterglow light converting agent has the chemical composition general formula: SrAl 2 O 4‑3x/2 N x :Eu 2+ ，RE 3+ Wherein Re 3+ Is Dy 3+ 、Nd 3+ 、La 3+ 、Ho 3+ 、Pr 3+ 、Er 3+ or a combination of more of rare earth elements, wherein the value range of x is 2/3-2, the long afterglow light conversion agent has the advantages that the long afterglow light conversion agent can fully absorb the purple light and the near ultraviolet light in the sunlight, and N is creatively introduced 3‑ The ions reconstruct the crystal field environment around the luminescence center, and make the emission wavelength red shift to the red region. |