Thermoluminescence studies of CdB4O7:Sm3+ phosphor

Abstract

Sm3+ doped cadmium tetra borate CaB4O7 phosphors were prepared using solid state reaction method. X- ray diffraction technique for the structural characterization and EDX is used for confirmation of elemental composition. The samples were synthesised at two different temperatures. For the synthesized powder (phosphor) at 650 °C, a well matched diffraction pattern with the standard XRD (JCPDS file no. 30–0204) was recorded, whereas for the second powder synthesized at 850 °C decomposed, polycrystalline, combined phase was recorded. The variations in thermoluminescence (TL) glow curves for different UV dose were recorded. The rise in TL intensity was recorded with the increment in the UV dose and the maximum TL intensity recorded was, for 25 min UV dose. The TL peak then decrease with the increment in the UV dose. Thermoluminescences of prepared powder with different percentage of samarium ions were also compared. The maximum thermoluminescence peak was recorded for the prepared phosphor with 0.5 % of Sm3+ ions.