Effect of H₃BO₃on the phase stability and long persistence properties of Sr_3.96Al₁₄O₂₅:Eu²⁺_0.01, Dy³⁺_0.02phosphor

Abstract

Sr3.96Al14O25:Eu2+,Dy3+ long persistent materials with different weights of H3BO3 prepared by the high temperature solid-state reaction method were characterized by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), photoluminescence spectra (PL), and thermoluminescence (TL). The results of XRD indicate that the 3% addition of H3BO3 favorable for the formation of pure phase Sr4Al14O25, and SrAl12O19 was generated when there is a low content or high content of H3BO3. The average grain sizes of samples grow bigger with an increase of H3BO3. PL spectra show that the emission peak does not shift evidently and the emission intensity changes little, indicating that the different amount of H3BO3 has little influence on the crystal field. The decay characteristics and TL measurement show that H3BO3 affects the afterglow properties of Sr3.96Al14O25:Eu2+,Dy3+, because the increasing H3BO3 leads to more defects in the Sr4Al14O25 matrix.