Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/122836
Title: MULTIPHOTON ABSORPTION IN GRAPHENE AND METAL-ORGANIC FRAMEWORKS
Authors: CHEN WEIQIANG
Keywords: multiphoton absorption, graphene, excitonic Fano resonance, metal-organic frameworks, frequency-upconverted photoluminescence, energy transfer
Issue Date: 7-Dec-2015
Citation: CHEN WEIQIANG (2015-12-07). MULTIPHOTON ABSORPTION IN GRAPHENE AND METAL-ORGANIC FRAMEWORKS. ScholarBank@NUS Repository.
Abstract: In this dissertation, we investigate multiphoton absorption properties of two novel materials: graphene and metal-organic frameworks (MOFs). The dissertation divides into two parts. The first part reports our Z-scan measurements onto two-photon absorption (2PA) and one-photon absorption (1PA) saturation in graphene in the spectral range of 435-1100 nm. Both our experimental measurements and theoretical calculations verify that the excitonic Fano resonance plays an important role for 2PA of graphene in visible spectrum. Besides, a quadratic photon energy dependence of the measured saturation intensity/fluence is observed and underlying photo-dynamics is discussed. In the second part, we investigate multiphoton excited photoluminescence (MEPL) from three solid-state MOFs: MOFs 1a, 2 and 3. Largely enhanced MEPL compared to that of its ligand is observed in MOF 1a thanks to the rigidifying effect. Forster resonance energy transfer between host MOF and guest molecules leads to further enhancement on the MEPL in MOFs 2 and 3.
URI: http://scholarbank.nus.edu.sg/handle/10635/122836
Appears in Collections:Ph.D Theses (Open)

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