Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/34338
Title: Cyclophane and Bridged Triphenylamine Based Organic Materials for Optical Applications
Authors: TANAY PRAMANIK
Keywords: Cyclophane, Conjugated polymer, Bridged triphenylamine, Octupolar donor-acceptor compounds, Two-photon absorption
Issue Date: 8-Aug-2011
Source: TANAY PRAMANIK (2011-08-08). Cyclophane and Bridged Triphenylamine Based Organic Materials for Optical Applications. ScholarBank@NUS Repository.
Abstract: In the field of organic electronics, a major recent development was the discovery of organic electroluminescent conjugated polymers which have emerged as useful materials for their promising applications in organic light emitting diodes (OLED), organic field effect transistors (OFET) and photovoltaic cells. Currently, a major area of research in the field of organic electronics focuses on fine tuning the spectral and electronic properties of these conjugated polymers. The use of paracyclophane as a tunable centre for tuning the physical properties of polymers appears to be especially attractive. However, the use of metacyclophane as a tunable centre is not much explored in literature. One part of this thesis is focused on exploring the utility of metacyclophane as a tunable centre for tuning the optoelectronic properties of polymers. The demand of designing and synthesizing efficient two-photon absorption (TPA) chromophores is increasing in recent days because of the wide range of promising applications in biology and materials science. Triphenylamine based octupolar compounds are well known as efficient TPA chromophores. However, the need of exploring bridged triphenylamine based TPA materials still remains. So, other part of this thesis is focused on the synthesis of a series of bridged triphenylamine based octupolar TPA compounds. By studying their linear and non-linear optical properties, bridged triphenylamine is proved to be superior to triphenylamine for making TPA chromophores. Unsymmetrical octupolar compound is found to be more promising candidate for TPA materials compared to symmetrical one. Non-linear optical properties of a series of compounds were studied and compared to gain insight about the effect of p-spacer and effect of terminal electron acceptor on their TPA properties. Higher TPA cross-section and 2P brightness of our synthesized compounds compared to commercially available fluorophore indicates their potentiality to be used as 2P fluorescent probes. Bridged triphenylamine has emerged as an excellent and novel building block for making efficient TPA chromophores.
URI: http://scholarbank.nus.edu.sg/handle/10635/34338
Appears in Collections:Ph.D Theses (Open)

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