Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/120436
Title: MULTI-PHOTON ABSORPTION INDUCED PHOTOLUMINESCENCE IN DOPED SEMICONDUCTOR QUANTUM DOTS AND HETERO-NANOSTRUCTURES
Authors: RADHU SUBHA
Keywords: Multi-photon absorption, Quantum dots, Nanorods, Nonlinear absorption, Transient pump probe spectroscopy, Hetero-nanostructure
Issue Date: 10-Jul- 15
Source: RADHU SUBHA (0015-07-10). MULTI-PHOTON ABSORPTION INDUCED PHOTOLUMINESCENCE IN DOPED SEMICONDUCTOR QUANTUM DOTS AND HETERO-NANOSTRUCTURES. ScholarBank@NUS Repository.
Abstract: Materials with high multi-photon absorption cross-section are of recent interest in opto-electronic and biological applications such as optical limiting, three-dimensional data storage, multi-photon microscopy etc. Owing to the properties such as remarkable photo stability, brightness and size dependent absorption and emission, semiconductor nanocrystals (NCs) are preferred over other conventional fluorophores as bio-imaging probes in multi-photon microscopy. The major impediment to use multi-photon absorption in NCs for practical applications is the requirement of high excitation intensity because of the low absorption cross-section of nanocrystals in near-infrared (NIR) wavelengths. This dissertation aims at enhancing the multi-photon absorption cross-section of nanocrystals in NIR wavelengths by doping and by forming hetero-nanostructures. Specifically, this thesis presents the nonlinear optical investigations of the multi-photon absorption induced photoluminescence in Mn2+-doped ZnS nanocrystals and CdS-CdSe-CdS segmented nanorods. In addition to the nonlinear absorption studies, the charge transfer dynamics in CdS-CdSe-CdS segmented nanorods is also presented in this thesis.
URI: http://scholarbank.nus.edu.sg/handle/10635/120436
Appears in Collections:Ph.D Theses (Open)

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