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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 ...
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 ...
Thermal, structural and luminescent properties of long after-glow MAlxOy:Eu²+,Dy³+ (M: Sr, Ba) phosphors
(University of the Free State, 2010-11)
The optimization of properties for new and potentially useful materials becomes a continuous and sometimes a lifelong process if future applications are anticipated. Research on luminescent materials is a good example of ...
Characterization of Gd2O2S: Tb³+ phosphor powder and thin films
(University of the Free State, 2011-06)
Under Ultra violet (UV), cathode-ray and X-ray excitation, terbium activated rare earth oxysulphide (Gd2O2S:Tb3+) phosphors shows bright green luminescence. Due to its superior luminescent performance, Gd2O2S:Tb3+ phosphor ...
Characterization of SrAl₂O₄:Eu²⁺,Dy³⁺ nano thin films prepared by pulsed laser deposition
(University of the Free State, 2010-11)
English: Thin films of SrAl2O4:Eu2+,Dy3+ phosphor were deposited on silicon (Si (100)) substrates using a 248 nm KrF pulsed laser. Deposition parameters, namely; substrate temperature, pulse repetition rate, number of laser ...
Luminescent properties of synthesized PbS nanoparticle phosphors
(University of the Free State, 2008-08)
Luminescent lead sulphide (PbS) nanoparticles embedded in an amorphous silica (SiO2)
matrix were synthesized at room temperature by a sol-gel process. The prepared
nanocomposite materials were crushed into powders and ...
Synthesis and characterization of down−conversion nanophosphors
(University of the Free State, 2014-10)
Luminescent zinc aluminate (ZnAl2O4) nanoparticles, crystalline–low quartz and amorphous silica powders were incorporated with Ce3+ and Tb3+ ions. These powders were successfully synthesized by the solution combustion and ...
Investigation of the luminescent properties of metal quinolates (Mqx) for use in OLED devices
(University of the Free State, 2014-01)
Since Tang and VanSlyke developed the first organic light emitting diode (OLED) in the late 80’s using tris-(8-hydroxyquinoline) aluminium (Alq3) as both the emissive and electron transporting layer, a lot of research has ...
Luminescence from lanthanide ions and the effect of co-doping in silica and other hosts
(University of the Free State, 2012-07)
Amorphous silica powders doped with lanthanide ions were synthesised by the sol-gel method and their cathodoluminescence (CL) and photoluminescence (PL) emissions were compared. Interesting differences depending on the ...
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 ...