고상법으로 합성한 Sr4-(x+y+z)Al14O25: Eu(x), Dy(y), Ag(z)계 축광성 형광체 장잔광의 연구

Long-lasting brightness Sr4Al14O25: Eu2+, Dy3+, Ag+ phosphor was synthesized by modified solid state reaction and its photoluminescence was investigated. Sr(NO3)2 and Al(NO3)3 ·9H2O as starting materials, and B2O3 as a flux were mixed with Eu2O3 as an activator, Dy2O3 as a coactivator, and AgNO3 as a charge compensator. The crystalline of target powder showed a 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 luminescence meter. The of photoluminescence intensity of the Sr3.64Al14O25: Eu0.11, Dy0.22, Ag0.03 phosphor was higher than other compositions and afterglow brightness was 0.186 cd/m2.