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. 2014 Aug 24;4(11):1112–1122. doi: 10.7150/thno.9710

Figure 1.

Figure 1

Morphology and luminescence properties of LGO:Cr nanoparticles. (A) TEM image of LGO:Cr nanoparticles. (B) Normalized excitation and emission spectra of LGO:Cr nanoparticles at room temperature. The excitation spectrum was obtained by monitoring at 716 nm emission. (C) NIR persistent luminescence decay curve of LGO:Cr nanoparticles monitored at 716 nm after irradiation by a 254 nm UV lamp for 15 min. The bottom curve is the background. The inset is the persistent luminescence emission spectrum recorded at 10 s after the UV irradiation. (D) PSPL decay curves monitored at 716 nm emission after stimulation by a white LED flashlight for 15 s. The red solid curve was acquired on a 24 h decayed sample (pre-irradiated by a 254 nm UV lamp for 15 min), while the grey dash line curve was recorded on a bleached sample (without UV pre-irradiation). The inset is the PSPL emission spectrum of the 24 h decayed sample, which was recorded at 10 s after the stimulation.