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<p>Femtosecond laser (fs) irradiation is an effective way to print perovskite quantum dots (PeQDs) in robust glass. Nevertheless, the laser writing-erasing-recovery process of PeQDs is highly dependent on the glass network structure, which is far from being well understood. In this work, we demonstrate that the lanthanide oxides (Ln<sub>2</sub>O<sub>3</sub>, Ln=La, Gd and Lu) in borosilicate glass enable to modulate the connectivity of the silicon-oxygen network and control <i>in situ</i> formation of CsPbBr<sub>3</sub> PeQDs induced by fs laser. Importantly, PeQDs can be erased in specific regions through subsequent laser irradiation only when doped with an optimal concentration of Ln<sub>2</sub>O<sub>3</sub>, which facilitates a looser network structure and reduces the crystallization barrier for ion migration. Subsequently, the degraded perovskite material can autonomously regenerate due to the water molecule invasion. The recovery time shows significant variation determined by the type and concentration of lanthanide ions. This reversible luminescence can be cycled multiple times while maintaining stable luminescence properties, providing a foundation for the development of innovative encryption methods in safeguarding information and anti-counterfeiting.</p>

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Reversible laser-printing perovskite quantum dots in glass via lanthanide doping

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Han Xiao,
  • Zhehong Zhou,
  • Hanqiao Liu,
  • Bin Zhuang,
  • Tao Pang,
  • Lingwei Zeng,
  • Jidong Lin,
  • Ruidan Zhang,
  • Daqin Chen

摘要

Femtosecond laser (fs) irradiation is an effective way to print perovskite quantum dots (PeQDs) in robust glass. Nevertheless, the laser writing-erasing-recovery process of PeQDs is highly dependent on the glass network structure, which is far from being well understood. In this work, we demonstrate that the lanthanide oxides (Ln2O3, Ln=La, Gd and Lu) in borosilicate glass enable to modulate the connectivity of the silicon-oxygen network and control in situ formation of CsPbBr3 PeQDs induced by fs laser. Importantly, PeQDs can be erased in specific regions through subsequent laser irradiation only when doped with an optimal concentration of Ln2O3, which facilitates a looser network structure and reduces the crystallization barrier for ion migration. Subsequently, the degraded perovskite material can autonomously regenerate due to the water molecule invasion. The recovery time shows significant variation determined by the type and concentration of lanthanide ions. This reversible luminescence can be cycled multiple times while maintaining stable luminescence properties, providing a foundation for the development of innovative encryption methods in safeguarding information and anti-counterfeiting.