Kuzmenko Natalia K, Logunov Lev S, Kolobkova Elena V, Nikonorov Nikolay V, Makarov Sergey V, Kuznetsova Maria S, Bataev Matvey N, Ubyivovk Evgenii V
ITMO University, St Petersburg, 197101, Russia.
St Petersburg State Technological Institute (Technical University), 190013, Russia.
Nanoscale. 2025 Jul 24;17(29):17384-17396. doi: 10.1039/d5nr00652j.
In this work, perovskite CsPbBr nanocrystals (NCs) were grown using a femtosecond laser (fs) in a transparent fluorophosphate (FP) glass matrix without damage to the material. TEM images showed the formation of CsPbBr quantum dots (QDs) with sizes of 3-4 nm in the glass matrix after fs laser irradiation. Additional low-temperature treatment leads to the growth of NCs (12 nm) and the appearance of luminescence due to the annealing of defects caused by the capture of photoelectrons by the glass matrix. The effects of writing conditions (pulse power, repetition rate, and recording speed) on luminescence were analyzed. The long-term relaxation of the electronic subsystem in CsPbBr NCs after high-energy fs pulses was recorded. Luminescence spectra at cryogenic temperatures (10 K) and TEM images showed a two-mode size distribution of NCs. The erasure-recovery process of the record was examined, and it was found that the luminescence disappeared when the luminescent NCs were exposed to lower-energy fs pulses. Full recovery of luminescence of Ns occurred during low-temperature annealing at 100-300 °C. Such recording and erasure processes can be repeated for many cycles without changing the luminescence parameters. The stability of the luminescence parameters of NCs in the glass matrix in response to external influences and temperature makes them promising in such fields as high-capacity optical data storage and information encryption.
在这项工作中，使用飞秒激光（fs）在透明氟磷酸盐（FP）玻璃基质中生长钙钛矿CsPbBr纳米晶体（NCs），且不会对材料造成损伤。透射电子显微镜（TEM）图像显示，飞秒激光照射后，玻璃基质中形成了尺寸为3 - 4纳米的CsPbBr量子点（QDs）。额外的低温处理导致纳米晶体生长至12纳米，并由于玻璃基质捕获光电子引起的缺陷退火而出现发光现象。分析了写入条件（脉冲功率、重复率和记录速度）对发光的影响。记录了高能飞秒脉冲后CsPbBr纳米晶体中电子子系统的长期弛豫。低温（10K）下的发光光谱和TEM图像显示纳米晶体具有双模尺寸分布。研究了记录的擦除 - 恢复过程，发现当发光纳米晶体暴露于低能量飞秒脉冲时，发光消失。在100 - 300°C的低温退火过程中，纳米晶体的发光完全恢复。这种记录和擦除过程可以重复许多循环，而不会改变发光参数。玻璃基质中纳米晶体发光参数对外界影响和温度的稳定性使其在高容量光学数据存储和信息加密等领域具有应用前景。
