Optically Stimulated Luminescence (OSL) technique has emerged as a serious competitor to Thermally Stimulated Luminescence (TSL) technique in various dosimetric applications, especially after the development of crystalline alumina (Al2O3:C) doped with carbon. Since then, several attempts are being made to develop other possible materials for OSL based dosimetric applications. Efforts conducted in our laboratory in this direction have led to the development of a new phosphor, Lithium Magnesium Phosphate doped with terbium and boron (LiMgPO4:Tb,B). This phosphor is prepared by solid-state diffusion method involving conventional air furnaces with operating temperature 1000 °C and easily amenable to large scale production without compromising primary dosimetric advantages. In this work we present some of the dosimetric OSL characteristics of this phosphor. The phosphor exhibits a main TSL peak at 250 °C. The phosphor also emits OSL, when the irradiated phosphor is stimulated with 470 nm light with the OSL sensitivity 1.3 times that of commercially available Al2O3:C. Photoluminescence (PL) emission spectrum consists of sharp lines characteristics of Tb3+ emission. The OSL discs made out of this phosphor are reusable up to at least 50 cycles, the phosphor exhibits dose linearity up to 1 kGy. Minimum detectable dose is found to be 20 μGy and fading of the OSL signal is found to be about 16% in four days, after which the OSL signal stabilizes.

LiMgPO4:Tb,B – A new sensitive OSL phosphor for dosimetry

Improvement of the crystallinity and photocatalytic property of zinc oxide as calcination product of Zn–Al layered double hydroxide

Starch – A suitable fuel in new low-temperature combustion-based synthesis of zinc aluminate oxides

The quest for new thermoluminescence and optically stimulated luminescence materials: Needs, strategies and pitfalls

Preparation and TSL studies in Tb activated LiMgPO4 phosphor

TSL, OSL and ESR studies in ZnAl2O4:Tb phosphor

Magnesium aluminate (MgAl 2 O 4 ) doped with terbium was prepared by combustion synthesis. Defect centres of MgAl 2 O 4 :Tb arc studied by correlating various techniques such as Electron Spin Resonance (ESR), Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL). TL studies on MgAl 2 O 4 :Tb 3+ show two TL peaks at 120 and 340°C. MgAl 2 O 4 :Tb 3+ exhibits OSL when stimulated with 470 nm blue light. ESR study shows two defect centres with g = 2.011 and g = 2.0052 which are assigned to V- centre and F + centre, respectively. Step anncaling ESR technique study suggests that V-centre is correlated to 120°C TL peak whereas F + centre is correlated with both the 120 and 340°C TL peaks. A TL mechanism is proposed. ESR―OSL correlation studies are carried out. The results of GSR-OSL correlation study along with TL bleaching study support the proposed TL mechanism of 20°C TL peak.

http://nopr.niscair.res.in/bitstream/123456789/4514/1/IJPAP%2047%286%29%20420-425.pdf

Role of defect centres in thermoluminescence mechanism of Tb 3+ doped MgAl 2 O 4

Phase transformation, morphology, DC electrical resistivity and dielectric properties investigations of properties of Manganese doped barium titanate nanoparticles

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Papers

TSL, OSL and ESR studies in ZnAl2O4:Tb phosphor

Role of defect centres in thermoluminescence mechanism of Tb 3+ doped MgAl 2 O 4

Phase transformation, morphology, DC electrical resistivity and dielectric properties investigations of properties of Manganese doped barium titanate nanoparticles