| 초록 |
Long-lasting brightness Sr4Al14O25 : Eu2+,Dy3+,Ag+ phosphor was synthesized by modified solid state reaction and its photoluminescence were investigated. Sr(NO3)2 and Al(NO3)3•9H2O as starting materials, and B2O3 as a flux were mixed with Eu2O3 as a activator, Dy2O3 as a coactivator, and AgNO3 as a charge compensator. The crystalline of target powder showed single-phase Sr4Al14O25 by the XRD characterization and the average particle size was about 20 ~ 30 ㎛ from the FE - SEM observation. Ag+ ion doping effects (0 ~ 0.06 mol) on Sr4Al14O25 : Eu2+,Dy3+,Ag+ phosphor were measured by photoluminescence spectrometer and their characteristics. Sr3.64Al14O25, Eu0.11,Dy0.22,Ag0.03 phosphor of photoluminescence intensity was higher than other compositions and afterglow brightness was 0.186cd/m2. |
