| Luminescence Properties of Eu2+/Eu3+ Activated
Barium Aluminate Phosphors with
Gd3+ Concentration Variation |
B. Marí1, K. C. Singh, N. Verma*, M. Mollar1 and J. Jindal
pages : 157-161
DOI : 10.1080/0371750X.2015.1082932 |
| Abstract |
| BaAl2O4:Eu2+/Eu3+ (1 mol %) co-doped with varying concentrations of Gd3+ (1, 2, 5 and 10 mol%) were prepared by
combustion synthesis method at 600oC. All the compositions were investigated for their structural and
photoluminescence properties. Samples prepared in open atmosphere showed the presence of both Eu3+ and Eu2+
states which indicates the reduction of Eu3+ to Eu2+ during the preparation of these compounds. The prepared
materials at 600oC showed high intense broad peaks around 498 nm corresponding to Eu2+ and small peaks in the
red region which are attributed to the presence of Eu3+. In the 1000oC annealed compounds, the intensity of the
peak at 498 nm got increased. The intensity of this broad band for BaAl2O4:Eu2+/Eu3+(1 mol%):Gd3+(1 mol%) was
three times than that of BaAl2O4:Eu2+/Eu3+(1 mol%). Thus second rare earth ion (Gd3+) acted as a good sensitizer
and enhanced the photoluminescence intensity. The XRD spectra revealed the presence of hexagonal phase of
BaAl2O4 as main phase and a small amount of a mixed phase Ba O! 6.6 Al2O3. Doping of Eu3+, Gd3+ did not change
the crystalline structure of barium aluminate (BaAl2O4).
[Keywords: Phosphors, Luminescence, Combustion method, Barium aluminate] |
| Full text : Subscribe to Download Full Text |
| [Go Back] |
|
