To be published in Optics Letters: Title: Authors: Accepted: Posted Doc. ID:
Broadband femtosecond nonlinear optical properties of CsPbBr3 perovskite nanocrystals K N KRISHNAKANTH KATTURI,Sudipta Seth,Samanta Anunay,Venugopal Rao Soma 22 December 17 05 January 18 312923
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Broadband femtosecond nonlinear optical properties of CsPbBr3 perovskite nanocrystals KATTURI NAGA KRISHNAKANTH,1 SUDIPTA SETH,2 ANUNAY SAMANTA,2 SOMA VENUGOPAL RAO1,* 1Advanced
center for research in high energy materials (ACRHEM), University of Hyderabad, Hyderabad 500046 India of Chemistry, University of Hyderabad, Hyderabad 500046 India *Corresponding author:
[email protected] OR
[email protected] 2School
Received XX Month XX; revised XX Month, XX; accepted XX Month XXXX; posted XX Month XXXX (Doc. ID XXXXX); published XX Month XXXX
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visible absorption spectrum provided the first absorption onset of NCs at 498 nm and in NRs at 510 nm. The sizes of the NCs and NRs, estimated from TEM images, were ~12±2 nm and 80±10 nm (diameter). The HR-TEM images [figure 1(b) and (e)] with clear lattice fringes indicate high crystallinity of the material. Complete details of characterization of these nanomaterials were summarized in an earlier work [15]. The NCs/NRs films were prepared by dropcasting ~150 μl of the respective colloidal solutions (typically μM) on a glass subtrate (2.3×2.3 cm2) and subsequently permitting the solvent evaporation at room temperature under high vaccum [insets of figure 1(c) and 1(f)]. The thickness of the prepared films, measured using AFM, were estimated to be ~35 nm in the NCs case and ~200 nm in the NRs case. The length of the NRs varied from 0.5 to 2 μm. The absorbance (typically
