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Tunable multicolour emission from dysprosium-doped mixed rare-earths oxyorthosilicate nanophosphors for application in ultraviolet-pumped multicolour and white light emitting diodes
(University of the Free State, 2015-02)
Phosphors have many uses today in applications such as electronic information displays, solid state lighting, solar cells, advertising and theft prevention. By using urea-assisted solution combustion method, we prepared ...
Synthesis and characterization of strontium (Sr), barium (Ba) and calcium (Ca) aluminate phosophors doped with rare earth ions
(University of the Free State, 2009-08)
The luminescent and structural properties of the alkaline earth aluminate phosphors prepared by solid state reaction, combustion and sol-gel methods are discussed. The Solid state and Sol-gel methods required much longer ...
Synthesis, characterization and luminescent mechanism of ZnS:Mn²+ nanophosphor
(University of the Free State, 2009-11-30)
ZnS:Mn2+ is commercially used in field emission displays (FEDs) and biological imaging of brain tumors. This study was done to determine the luminescent mechanism of both bulk and nano sized ZnS:Mn2+. Luminescent zinc ...
Characterization of Y3(Al,Ga)5O12:Ce3+ phosphor thin films prepared by pulsed laser deposition
(University of the Free State, 2013-11)
The morphological and luminescent properties of Y3(Al,Ga)5O12:Ce3+ powder phosphor were investigated. Scanning Electron Microscopy (SEM) revealed the phosphor’s agglomerated particles with a size ranging from 0.4μm to ...
Persistent luminescence mechanism of tantalite phosphors
(University of the Free State, 2014-11)
Pr3+ ion doped ZnTa2O6, SrTa2O6, CaTa2O6 and ZnTaGaO5 phosphors, which display persistent
luminescence were prepared by solid state chemical reaction at 1200 oC for 4 hours. A
ZnTa2O6:Pr3+ phosphor that resembled an ...
Preparation and properties of long afterglow CaAl₂O₄ phosphors activated by rare earth metal ions
(University of the Free State, 2011-11)
This work comprises of several aspects of calcium-aluminate phosphor activated with rare earth metal ions i.e. (CaAl2O4:Eu2+, Nd3+, and Dy3+). In particular the luminescent and structural properties of the long afterglow ...
Luminescent properties of Y₃(Al;Ga)₅O₁₂: Tb thin films
(University of the Free State, 2015-08-08)
English: The main aim of this project was to use the technique of pulsed laser depo- sition (PLD) to fabricate thin lms from Yttrium Aluminium Gallium Oxide (Y3(Al; Ga)5O12) doped with Tb3+ ions and then to investigate ...
Synthesis and characterization of MgAl₂O₄ and (MgxZn₁-x)Al₂O₄) mixed spinel phospors
(University of the Free State, 2014-01)
Magnesium aluminate (MgAl2O4) has received special attention as a technologically important material because of its attractive properties, such as mechanical strength, chemical inertness, a wideband gap, relatively low ...
Synthesis and characterization of MBxOy:Eu (M = Ca, Sr, Ba) phosphors and TiO2 semiconductor for application in luminescence and energy materials
(University of the Free State, 2014-11)
MBxOy:Eu (M = Ca, Sr, Ba) phosphors with different Ca:B /Sr:B /Ba:B molar ratio and with constant Eu concentration have been synthesized by a solution combustion method at initial reaction temperature of 5000C for 15 ...
Luminescent properties of Y2SiO5:Ce thin films
(University of the Free State, 2010-05)
The luminescent properties of yttrium silicate doped with cerium (Y2SiO5:Ce) phosphor thin films were investigated. A detailed investigation (cathodoluminescence (CL), photoluminescence (PL) and Gaussian peak fits) was ...