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Title
DEDICATION
CERTIFICATE
DECLARATION
ACKNOWLEDGEMENT
CONTENTS
Preface
1. General Introduction
1.1 General background and technological properties
1.2 Definition of a glass
1.3 Formation of glass
1.3.1 Glasses from melts
1.3.2 Sol-gel processing
1.3.3 Structural changes during gel to glass transition
1.4 Structure and topology
1.5 Spectroscopy of Porphyrines and Phthalocyanines
1.6 Glass as laser host
1.7 Spectroscopy of rare earths in solid hosts
1.7.1 General
1.7.2 Symmetry considerations
1.7.3 Term symbols
1.7.4 Judd-Ofelt theory
1.8 Radiative and non-radiative transitions
References
2. Spectroscopic and dal Constants of ?alocyanines in Glassy medium
2.1 Introduction
2.2 Experimental details
2.3 Results and discussion
2.3.1 Absorption studies
2.3.1.1 Band assignments and interpretation of the spectra
2.3.1.2 Appearance of new bands
2.3.1.3 Band energies and oscillator strength
2.3.1.4 Effects of metals and redshift
2.3.2 Fluorescence studies
2.4 Conclusion
References
3. Optical Properties of Porphyrines in Borate Glassy Matrix
3.1 Introduction
3.2 Experimental
3.3 Results and discussion
3.4 Conclusion
References
4. Spectroscopic Characterization of Chromium in Sol-Gel Silica
4.1 Introduction
4.2 Experimental
Fig. 4.1. Typical photograph of (a) Cr-doped silica glass (b) pure silica glass
4.3 Results and discussion
4.3.1 Thermo gravimetric analysis
4.3.2 FTIR analysis
4.3.3 Optical absorption studies
4.3.4 Crystal field parameters
4.3.5 Fluorescence studies
4.3.6 ESR analysis
4.3.7 Nature of Cr valence states in silica gel glass
4.4 Conclusion
References
5. Spectroscopic Studies of Dy3+ in Sol-Gel Silica Matrices
5.1 Introduction
5.2 Theoretical analysis
5.3 Experimental details
5.4 Results and discussion
5.4.1 Optical absorption studies
5.4.2 Judd-Ofelt analysis and radiative parameters
5.4.3 Fluorescence studies
5.4.4 Effect of co-doping
5.4.5 Structural studies
5.5 Conclusion
References