Electrooptical characteristics of nanoscale and bulk long persistent phosphor SrAl₂O₄ : Eu, Dy

Figures & data

Figure 1. X-ray diffraction spectra of nanoscale (a) and bulk (b) SrAl₂O₄ : Eu²⁺, Dy²⁺ phosphors.

Figure 2. The TEM image of nanoscale SrAl₂O₄ : Eu²⁺, Dy³⁺.

Figure 3. The normalised excitation spectra monitored at 520 nm and the emission spectra excited at 360 nm of nanoscale and bulk SrAl₂O₄ : Eu²⁺, Dy³⁺.

Figure 4. I–V curve of bulk SrAl₂O₄ : Eu, Dy in dark or in light, V: 0–200 V.

Figure 5. I–V curve of nanoscale SrAl₂O₄:Eu, Dy in dark or in light, V: 0–200 V.

Figure 6. Luminance power vs. time (s).

Figure 7. Mechanism of long persistent phosphorescence.