Nanoscale Research Letters ( IF 5.5 ) Pub Date : 2020-08-20 , DOI: 10.1186/s11671-020-03393-y Juan Hao 1 , Lingyun Pan 2 , Minghui An 1 , Yunzhi Dai 1 , Bingrong Gao 1
In the study, well-crystallized nano-diamonds with an average size of 3.8 nm are obtained via femtosecond laser ablation. Both steady-state and transient luminescence are observed. The luminescence peaks of nano-diamonds shift from 380 to 495 nm when the excitation wavelength changes from 280 to 420 nm. After passivation by polyethylene glycol-400N, the surface of nano-diamonds is significantly oxidized, which is verified by Raman and UV-Vis absorption spectra. Furthermore, there is no change in all the luminescence wavelengths, although the maximum intensity increases by 10 times. Time-resolved luminescence spectra reveal that trapping states can be modified by surface passivation, and this leads to stronger luminescence with a longer lifetime.
中文翻译:
激光加工纳米金刚石的时间分辨发光特性。
在这项研究中,通过飞秒激光烧蚀获得了平均结晶度为3.8 nm的结晶良好的纳米金刚石。观察到稳态和瞬态发光。当激发波长从280 nm变为420 nm时,纳米金刚石的发光峰从380 nm变为495 nm。通过聚乙二醇400N钝化后,纳米金刚石的表面被显着氧化,这通过拉曼光谱和UV-Vis吸收光谱进行了验证。此外,尽管最大强度增加了10倍,但所有发光波长都没有变化。时间分辨的发光光谱表明,俘获态可以通过表面钝化来改变,这导致更强的发光和更长的寿命。