Search
Now showing items 1-10 of 17
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 ...
Red emission of Praseodymium ions (Pr ³⁺)
(University of the Free State, 2011-11)
English: Red glowing phosphors were prepared by adding Pr3+ ions as activators to several oxide host matrixes; CaTiO3, LaTaO4, YTaO4, and GdTaO4. The perovskite CaTiO3:Pr3+ compound is a phosphor that glows with a single ...
Study on luminescence and structural properties of vanadates phosphors
(University of the Free State, 2016-01)
A self-activated yellow emitting zinc vanadate (Zn2 Y20 1) was synthesized by combustion
method. The influence of the processing parameters such as synthesis temperature and
dopants concentration on the structure, ...
Material Properties of RE- Doped Ln (Ln= Y, La) oxides and oxysulfides phosphors for red-emitting devices
(University of the Free State, 2015-11)
Structural and optical properties of Eu3+-doped Ln (Ln=Y, La) oxide and oxysulfide nano
crystals synthesized by sol-combustion method were analysed as a function of host to fuel
ratio. Structural characterization shows ...
A comparative study between the simulated and measured cathodoluminescence generated in ZnS phosphor powder
(University of the Free State, 2003-08)
In the past few decades cathode ray tubes (CRTs) have dominated the display market
because of their excellent image quality, ease and economy of manufacture. However
their bulky packaging and high power consumption make ...
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 ...
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 ...
Study of the structure, particle morphology and optical properties of mixed metal oxides
(University of the Free State, 2017-01)
The structure, morphology and optical properties of metal oxides (ZnO, MgO and SrO), their composites (MgO-ZnO, SrO-ZnO) and systems with different x molar concentration values (0.2, 0.4, 0.5, 0.6, 0.7, 0.8) of MgxZn1-xO ...
Effect of broadband excitation ions in the luminescence of Ln.³+ doped SrF₂ nanophosphor for solar cell application
(University of the Free State, 2015-06)
SrF2:Pr3+-Yb3+ phosphor powder was previously investigated for down-conversion application
in solar cells. The rst surface, structural and optical characterization results
indicated that the Pr3+-Yb3+ couple requires a ...
Sol-gel synthesis of and luminescent properties of Pr³⁺ in different host matrices
(University of the Free State, 2009-11)
Luminescent ZrO2:Pr3+ , SiO2:Pr3+, ZnO:Pr3+ and ZnS:Pr3+ nanophosphors were synthesized by a sol-gel method, dried, ground and annealed in air at 600oC (SiO2:Pr3+, ZrO2:Pr3+, ZnO:Pr3+ and ZnS:Pr3+) or 280oC (ZrO2:Pr3+). ...