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International Conference on

Minerals, Metallurgy and Materials

March 22-24, 2021 | Valencia, Spain

Desta

Speaker for Materials Science Conference-Desta
Desta
University of the Free State, Harrismith, South Africa
Title : Effect of doping Dy3+ on the structural and photoluminescence properties of Ba1. 3Ca0.7SiO4: Dy3+ phosphors for white lighting applications

Abstract:

In this study, white light-emitting Ba1.3Ca0.7SiO4: x mol%Dy3+ (x = 0, 1, 2, 3, 4, and 5) phosphors were prepared by low temperature solution combustion method at 550 0C. The effect of dopant molar percentage on the structural, morphological, optical and luminescence properties of synthesized phosphors was characterized by XRD, SEM, UV- vis, and PL. Important crystallographic parameters such as phase, average crystallite-size, and strain in the crystal were determined from the XRD diffraction pattern. SEM images show that the synthesized nanopowders consists of small particles of sizes in the order of few microns that are uniformly distributed having clear grain boundaries with different sizes, but became agglomerated with high content of Dy3+ ions [1]. The EDS result shows the presence of elements such as Ca, Ba, Si, O, and Dy in the samples. UV-vis measurement confirms the percent re?ectance in the UV- region to be dependents on Dy3+ ions and the estimated bandgap varies between 3.60 and 3.85 eV. The PL measurement when samples probed with 350 nm excitation wavelength shows emission spectra that comprise two strong peaks at 482 nm (blue) and 575 nm (yellow) bands corresponding to the 4F9/2→6H15/2 and 4F9/2→6H13/2, respectively [2]. The interaction responsible for the energy transfer mechanism between Dy3+ ions was dipole-dipoles interaction and this situation has happened at the higher molar concentration of Dy3+ ions in the host lattice. The calculated CIE color coordinates confirmed that by varying the content of Dy3+ the luminescence color of Ba1.3Ca0.7SiO4: Dy3+ were tuned from blue to white region.
Audience Takeaway:
The Structural and morphology of the synthesized Ba1.3Ca0.7SiO4: Dy3+
The structural, morphology, optical, and photoluminescence properties of the synthesized materials using analytical technique
The Photoluminescence properties of the synthesized nanomaterials
 

Biography:

 Mr. Desta Regassa physics at the Addis Ababa University, Ethiopia and graduated as MS.c in 2014. He then joined the research group of Prof. BF Dejene at the University of the Free State, South Africa. Currently he is studying PhD in material science and physics. He has published 1 research articles in Optics and electronic material journal

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