63^rd ANNUAL CONFERENCE OF THE SA INSTITUTE OF PHYSICS

The effect of varying Cu2+ concentration on the structure and optical property of BaAl2O4: x%Cu2+ (0 ≤ x ≤ 1) nano-phosphors prepared using the citrate sol-gel method.

28 Jun 2018, 15:00

2h

Poster Presentation Track A - Physics of Condensed Matter and Materials Poster Session 2

Speaker

Mr Vusani Muswa Maphiri (Sefako Makgatho Health Science University)

Description

Barium aluminates (BaAl2O4) are an important class of materials of the alkaline earth aluminates. BaAl2O4 phosphors are known for their high emission intensity and long afterglow. In this study, the emission from the BaAl2O4 is being further optimized by introducing Cu2+ ions within the host matrix. Hear it is shown that BaAl2O4 has an optimum emission, when doped with 0.075% Cu2+ and excited by the 282 nm. BaAl2O4:Cu2+ system has never been reported on literature. BaAl2O4 is known to emit a blue colour. When BaAl2O4 is doped with rare earth metal such as trivalent europium (Eu3+) it is known to emit a red colour. In this study, the CIE also confirmed that the un-doped (host) emits a blue colour. When varying the excitation wavelength for the x = 0.075% or varying the dopant concentration the emission colour shifts from navy blue to the light blue. Our results show the appropriate excitation wavelength to get the highest emission. These results also show the excitation wavelength and dopant concentration together with they are corresponding expected emission colour.

Supervisor details<br><b>If not a student, type N/A.</b><br>Student abstract submision<br>requires supervisor permission:<br>please give their name,<br> institution and email address.

Dr S.V. Motloung, Department of Physics, Sefako Makgatho Health Science University, P. O. Box 94, Medunsa, 0204, South Africa, cchataa@gmail.com