Size-Dependent Optical Properties of Nanoscale and Bulk Long Persistent Phosphor SrAl₂O₄:Eu²⁺, Dy³⁺

Figure 1

Emission spectra and excitation spectra. (a) Emission spectra of nanoscale and bulk SrAl₂O₄:Eu²⁺, Dy³⁺,  nm. (b) Afterglow mechanism of long persistent phosphor. (c) Excitation spectra of nanoscale and bulk SrAl₂O₄:Eu²⁺, Dy³⁺,  nm. (d) The enlarged drawing of excitation spectra of nanoscale SrAl₂O₄:Eu²⁺, Dy³⁺ in the vicinity of 394 nm,  nm. (A), (B), and (C) correspond, respectively, to the nanomaterial prepared at 1000°C, 1100°C, and 1200°C and (D) corresponds to the bulk material. The particle size is .

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