Figure 3.

Different compositions of PLNs can affect optical physiognomies. a) Scheme energy diagram using PLNs. Cr³⁺ and Sn⁴⁺ have the ability to delay electron emission. b) Stimulation of PLNs from under 250 to 565 nm leads to the emission of particles during UV irradiation and generates red to NIR luminescence. The lifetime results of c) ZGOCS (inset: afterglow images taken 1 min after UV irradiation) and d) ZGOC (inset: the amplified spectrum shows that the pure doping of Cr³⁺ has a long afterglow capability). The persistent luminescence signal can be detected by IVIS. The images were acquired 5 min and 10 min after UV exposure. The slice remained on top of the e) ZGOCS and ZGOC throughout the experiment. The test time was from 0.5 h to 10 h. The blue circle is a region of interest (ROI); the same regions were applied for all testing points.