Energy transfer for some organic compounds doped in Sol-Gel material
Other Title(s)
انتقال الطاقة لبعض المركبات العضوية المطعمة في ال Sol-Gel
Dissertant
al-Ubaydi, Isra Adnan Abd Allah
Thesis advisor
University
University of Baghdad
Faculty
College of Science
Department
Department of Physics
University Country
Iraq
Degree
Master
Degree Date
2013
English Abstract
In the present work, bi-molecular energy transfer from Rhodamine110 (R110) laser dye as donor to Oxizen1 (Ox1) and Nile blue (Nb) dyes as acceptors have been studied.
These dye mixtures had been incooperated in silica xerogel and thin film as host material using suitable sol-gel reaction parameters.
Spray pyrolysis technique has been used to prepare a homogenous and transparent film samples.
The final samples have been prepared as a function of dye mixture concentrations.
Different techniques have been used to test the prepared samples such as FTIR measurements, true volume measurements by gas displacement method, thin film thickness measurements as well as the spectroscopic tests in the visible region of electromagnetic spectrum.
The energy transfer process from donor (R110) to acceptor (Ox1) and from donor (R110) to acceptor (Nb) has been observed through the recorded spectra.
The spectroscopic parameters of energy transfer, namely the energy transfer rate constant (KET), the half quenching concentration [A]1/2, the critical energy transfer distance (Ro) and the energy transfer efficiency, have been calculated as a function of acceptor concentration.
Stern-Volmer relation of energy transfer process has been proved, and the range values of (KET) and (Ro) indicate that the nonradiation resonance energy transfer is the dominant mechanism of dyes mixture doped in sol-gel matrices.
The energy transfer efficiency has been increased with the increasing of acceptor concentrations.
The experimental results of this research show that the maximum efficiency has been found to be 54% and 53% for (1×10-4 R110- 5×10-4 Ox1) and (1×10-4 R110- 5×10-4 Nb) mixtures, respectiviely, doped in silica xerogel.
This efficiency has been decreased to 44% and 47% for the same mixture recipes doped in silica thin films, and this decreasing may be due to the difference in pores size for the two types of samples according to the difference in thermal treatment.
The results show that the emission properties of acceptor molecules (Ox1 and Nb) can be enhanced using the dye mixing recipe in sol-gel matrices.
This may be due to the behavior of donor molecules that reducing the interaction between acceptor molecules (at high concentration levels), and thus reducing the fluorescence concentration quenching.
Main Subjects
No. of Pages
101
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction and basic concepts.
Chapter Two : Experimental part.
Chapter Three : Results and discussion.
References.
American Psychological Association (APA)
al-Ubaydi, Isra Adnan Abd Allah. (2013). Energy transfer for some organic compounds doped in Sol-Gel material. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-606939
Modern Language Association (MLA)
al-Ubaydi, Isra Adnan Abd Allah. Energy transfer for some organic compounds doped in Sol-Gel material. (Master's theses Theses and Dissertations Master). University of Baghdad. (2013).
https://search.emarefa.net/detail/BIM-606939
American Medical Association (AMA)
al-Ubaydi, Isra Adnan Abd Allah. (2013). Energy transfer for some organic compounds doped in Sol-Gel material. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-606939
Language
English
Data Type
Arab Theses
Record ID
BIM-606939
