Understanding the timing and location of nanoparticle (NP) generation during pulsed laser ablation in liquid is important for their fabrication. We report on high-speed videographic observations of UV-induced photoluminescence from YVO 4 :Eu 3+ NPs following laser ablation in water. YVO 4 :Eu 3+ is a red-emitting phosphor under UV excitation. A white mist-like region of low brightness, thought to be emissions from these NPs, appeared at the target surface’s center after laser irradiation. The NPs appeared to be diffuse within the first generated bubble during the expansion phase and gathered in its center during the shrinkage phase, remaining within the bubble until its collapse.

中文翻译：

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水中激光烧蚀产生的YVO 4：Eu 3+纳米粒子的光致发光观察

了解在液体中进行脉冲激光烧蚀过程中产生纳米粒子（NP）的时间和位置对于其制造很重要。我们报告从水中的激光烧蚀后YVO 4：Eu 3+ NPs紫外线诱导的光致发光的高速摄影观察。YVO 4：Eu 3+是在紫外线激发下发红光的荧光粉。激光照射后，目标表面的中心出现了一个白色的雾状低亮度区域，被认为是这些纳米颗粒的发射。在膨胀阶段，NP似乎在第一个产生的气泡内扩散，而在收缩阶段，NP聚集在其中心，一直留在气泡内直至崩溃。