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

Figure 3

Size-dependent thermoluminescence spectra of SrAl₂O₄:Eu²⁺, Dy²⁺ phosphors. (a) Thermoluminescence spectra of nanoscale SrAl₂O₄:Eu²⁺, Dy²⁺ prepared by sol-gel method at 900°C (A), 1000°C (B), and 1100°C (C) and bulk phosphors (D) prepared by solid-state reaction method. (b) The Gausses fitted result of curve (B) in (a). (c) The Gausses fitted result of curve (C) in (a). (d) The Gausses fitted result of curve (D) in (a). The solid circles, up triangles, and down triangles correspond to the measured value and the open circles correspond to the Gauss fitted data.

(a)

(b)

(c)

(d)