ChemInform Abstract: The Greenish-Blue Emission and Thermoluminescent Properties of CaTa 2 O 6 :Pr 3+ (original) (raw)

Pr 3+ exhibits prominent red emission in most oxide phosphors, which comes from the 1 D 2 ? 3 H 4 transition, and greenish-blue emission from 3 P 0 ? 3 H 4,5 transitions is normally less intense. However, a greenish-blue emission was observed from CaTa 2 O 6 :Pr 3+ oxide phosphor prepared by solid state reaction at 1200°C. A combination of emission coming from 1 D 2 and 3 P 0 levels was observed, with the blue emission from the latter much more prominent. Upon investigating the thermoluminescence properties of the phosphor, the glow curves showed the presence of three different types of electron trapping centres. Interesting properties of the trapping centres, such as the competition between the trapping centres, pre-radiation effects and the calculation of the activation energy were studied. The phosphorescence decay curves showed long lasting afterglow.