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Nonlinear-Optical Response in Zeolitic Imidazolate Framework Glass.

Mohamed A Ali1, Xiaofeng Liu2, Yang Li3

  • 1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Inorganic Chemistry
|June 3, 2020
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Summary

Metal-organic frameworks (MOFs) in a glass state show unique nonlinear-optical (NLO) properties. Zn-Co-ZIF-62 glass exhibits strong NLO response due to cobalt ions, enabling potential photonic applications.

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Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) are increasingly explored in a stable vitreous (glass) state.
  • Understanding the physicochemical properties of MOF glasses is crucial for new applications.

Purpose of the Study:

  • To investigate the nonlinear-optical (NLO) response of zeolitic imidazolate framework-62 (ZIF-62) glasses based on Zinc (Zn) and Zinc-Cobalt (Zn-Co).
  • To explore the potential of MOF glasses in photonics.

Main Methods:

  • Utilized the open-aperture Z-scan technique to measure NLO properties.
  • Employed femtosecond laser excitation at 1030 nm and observed absorption at 1100 nm.

Main Results:

  • Zn-ZIF-62 glass showed no saturable absorption at 1030 nm due to low near-infrared (NIR) absorption.
  • Zn-Co-ZIF-62 glass displayed a significant NIR absorption band at 1100 nm.
  • Zn-Co-ZIF-62 glass exhibited a strong NLO response with a 63.85% modulation depth.

Conclusions:

  • The NLO response in Zn-Co-ZIF-62 glass is attributed to the transient saturation of Cobalt (Co) ion energy levels (4T1(4F)).
  • MOF glasses, particularly Zn-Co-ZIF-62, show promise for applications in sensing and optical modulation within photonics.