Haijie Guo,Lili Liu,Lei Wang,Qiufeng Shi,Jianwei Qiao,Cai'e Cui,Ping Huang,Yuhua Wang
Optical information storage technology offers several advantages, including cost-effectiveness, multidimensional storage, and rewritable capability. Consequently, it has become increasingly popular for optical storage media. Herein, a novel optical information storage material Na 2 CaGe 2 O 6 :Bi 3+ (NCGO:Bi 3+ ) is developed using a non-equivalent substitution strategy, which exhibits photochromic (PC) and ultraviolet persistent luminescence (UV PersL) properties. NCGO:Bi 3+ demonstrates excellent white-to-brown PC performance under 254 nm light irradiation. The brown phosphor can be effectively bleached using 425 nm light or thermal stimulation, demonstrating excellent reversibility over multiple cycles. Additionally, the phosphor displays UV PersL characteristics. The representative sample NCGO:0.001Bi 3+ with a duration time exceeding 10 h after 254 nm light excitation, peaking at 358 nm. Simultaneously, due to the electrons captured by deep traps can be released via low-energy light excitation, the sample also exhibits photostimulated PersL characteristics. Specifically, oxygen vacancies (V O ) are identified the primarily responsible for the observed PC and PersL phenomena by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analyses. Overall, this work indicates that the combination of 254 nm light-induced PC and PersL in a single material has potential for designing advanced luminescent materials for the application of optical information storage.
Reversible upconversion (UC) luminescence modulation by external stimuli (i.e. electric field, magnetic field, and light irradiation) is extremely attractive for applications in a broad range of fields, such as photoswitches, high-density optical data storage devices, and optical sensing. In this work, one kind of novel phosphor, Er3+-doped Bi4Ti3O12 (Bi4−xErxTi3O12) ceramics, prepared by a conventional solid-state reaction approach, is reported which exhibits both bright UC luminescence and a remarkable photochromic (PC) effect. The UC luminescence, PC effect, and the coupling between UC and PC performances were investigated in detail. It is found that the UC luminescence could be readily modulated by alternating visible light irradiation and a thermal stimulus, and a large reversible luminescence regulation has been achieved based on the PC reaction. Meanwhile, the modulation of UC luminescence was shown to tightly depend on the irradiation time and thermal treatment processes. In addition, the coloration and decoloration processes also exhibited good fatigue resistance. The mechanisms related to the UC emissions, PC processes, and luminescence modulation are also discussed. These results indicated that Bi4−xErxTi3O12 samples could be potentially utilized as a kind of optical data storage material.
危险品化学品经营许可证（带存储）