Exciton transfering macrocrystals of colloidal quantum dots
Author
Akcalı, İbrahim
Advisor
Demir, Hilmi Volkan
Date
2013Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
For nonradiative energy transfer (NRET) in the field of medicine and biology as
well as optoelectronics, recent advances in the fluorophores, and optical
techniques and devices have led to greatly increased interest in applications
employing NRET in the past decade. Replacing traditional fluorophores,
colloidal quantum dots have flourished the fluorescence properties of NRETbased
applications. This has also given rise to working with narrower tunable
emission at a higher quantum yield with broadband absorption, and easier
handling and fabrication compared to those of traditional fluorophores. A newly
discovered technique, QD incorporation into macrocrystals of various salts, has
enhanced the processability, photostability and robustness of these colloidal
QDs. To benefit from these enhanced properties for NRET, this thesis proposed
and studied macrocrystals for exciton transfer via NRET and fabricated those
considering NRET mechanism. The design of these QD-embedded macrocrystal
structures has enabled strong energy transfer. The experimentally measured
energy transfer reached ~51%, which was obtained with careful optimization.
Moreover, these hybrid structures have allowed for the observation of the QD
distribution dependence of the transfer efficiency for the QDs wrapped inside
macrocrystals. The steady state and time-resolved measurements in this thesis
revealed that QD-incorporated macrocrystals can possibly take place of QDs in
various NRET-related applications.