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

Figure 4

FTIR spectra of nanosized SrAl₂O₄:Eu²⁺, Dy²⁺ phosphors prepared by sol-gel method at 900°C (A), 1000°C (B), 1100°C (C), and 1200°C (D) and bulk phosphors prepared by solid-state reaction method (E).