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Multi-Photon Absorption in Metal-Organic Frameworks.

Raghavender Medishetty1, Lydia Nemec2, Venkatram Nalla3

  • 1Lehrstuhl für Anorganische und Metallorganische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany.

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|September 13, 2017
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Summary
This summary is machine-generated.

Metal-organic frameworks (MOFs) show strong multi-photon absorption (MPA) capabilities, a key nonlinear optical effect. This research highlights MOFs as novel solid-state materials for advanced optical applications.

Keywords:
TD-DFT calculationscharge polarizationmetal-organic frameworksnonlinear opticsphoton upconversion

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Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Multi-photon absorption (MPA) is a significant nonlinear optical (NLO) phenomenon with diverse applications in telecommunications, defense, photonics, and biomedicine.
  • Current MPA materials, such as dyes and polymers, are typically used in solution.
  • Metal-organic frameworks (MOFs) represent a new class of NLO solid-state materials with potential for enhanced MPA.

Purpose of the Study:

  • To demonstrate the design of MOFs for exceptionally strong MPA behavior.
  • To explore the potential of MOFs as solid-state alternatives to traditional MPA materials.

Main Methods:

  • Synthesizing MOFs using zirconium- and hafnium-oxo-clusters.
  • Incorporating tetraphenylethene (TPE) as a chromophore linker within the MOF structure.
  • Utilizing a theory-guided approach to optimize MPA properties through modular design.

Main Results:

  • MOFs featuring TPE linkers exhibited record high two-photon absorption (2PA) cross-section values, reaching up to 3600 GM.
  • The modular nature of MOFs enabled enhancement of MPA properties via tailored charge polarization, conformational strain, and linker arrangement.
  • Demonstrated the feasibility of designing solid-state MOF materials for superior MPA performance.

Conclusions:

  • MOFs can be strategically designed to achieve exceptionally strong MPA, surpassing conventional materials.
  • The modular building-block principle of MOFs offers a powerful platform for optimizing NLO properties.
  • These findings position MOFs as promising solid-state materials for advanced NLO applications.