Anila, E I; Dr.Jayaraj, M K(Cochin University of Science & Technology, March , 2008)
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Abstract:
This thesis has focused on the synthesis and analysis of some important
phosphors (nano, bulk and thin film) for display applications. ACTFEL
device with SrS:Cu as active layer was also fabricated.Three bulk phosphors: SrS:Cu,CI; SrS:Dy,Cl; and SrS:Dy,Cu,Cl were
synthesized and their structural, optical and electrical properties were
investigated. Special emphasis was given to, the analysis of the role of
defects and charge compensating centers, on the structural changes of the
host and hence the luminance. A new model describing the sensitizing
behaviour of Cu in SrS:Dy,Cu,Cl two component phosphor was introduced.
It was also found that addition of NH4CI as flux in SrS:Cu caused
tremendous improvement in the structural and luminescence properties.A novel technique for ACTFEL phosphor deposition at low temperature was
introduced. Polycrystalline films of SrS:Cu,F were synthesized at low
temperature by concomitant evaporation of host and dopant by electron
beam evaporation and thermal evaporatin methods.Copper doped strontium sulphide nanophosphor was synthesized for the first
time. Improvement in the luminescence properties was observed in the
nanophosphor with respect to it' s bulk counterpart.
Description:
Department of Physics,
Cochin University of Science and Technology