抄録
Abstract
Optical read-out data storage materials based on upconversion phosphors were studied to achieve low-energy consumption. Meanwhile, all-optical data write-in and read-out can be realized using photo-stimulated luminescence (PSL)-based optical data storage. In this study, PSL of Zn 2 GeO 4 :Mn 2+ (ZGO:Mn) and Zn 2 GeO 4 :Mn 2+ ,Ca 2+ (ZGO:Mn,Ca) powder samples synthesized using a solid-state method was measured and the saturation of the integrated PSL intensity against the excitation intensity was analyzed. From the integrated intensity ratio of excitation and PSL at the saturation point, the PSL trap densities were calculated to be N T ≃ 10 16 cm –3 . The excitation time dependence of the integrated PSL intensity and photoluminescence (PL) initial rise in ZGO:Mn and ZGO:Mn,Ca were also measured. The time constants of charging in the PSL trap were τ ex = 22.1 s (ZGO:Mn) and 36.2 s (ZGO:Mn,Ca), while those of the PL initial rise were τ 1 = 0.977 s, τ 2 = 10.7 s (ZGO:Mn) and τ 1 = 2.53 s, τ 2 = 24.0 s (ZGO:Mn,Ca). These results should contribute to advancing the design of all-optical data storage devices that consume less energy.