Effect of Sm3+ as co-dopant in CaSO4:Dy,P TLD phosphor

CaSO4: Dy,P  and CaSO4:Dy,P,Sm  thermoluminescence (TL) phosphors have been prepared by acid method and their TL glow curves and  photoluminescence (PL)  excitation and emission spectra are recorded. PL emission bands at 565, 599 and 613 nm were observed for CaSO4: Dy,P,Sm under the excitation wavelength 402 nm. Dosimetric peak is observed around 2460C at high temperature.  Co-doping of Sm3+ in CaSO4:Dy,P enhances its TL intensity by a factor of 1.11

Analysis of trapping parameters of KCaSO4Cl:Eu phosphor prepared by acid method

This paper reports the systematic study of KCaSO4Cl:Eu phosphor synthesised by acid distillation method. Single glow peak at 432 is observed in KCaSO4Cl:Eu phosphor. The study of trapping parameters is done with the help of Chen’s peak shape method

Display devices: past, present and future

Display devices: past, present and futur

Comparative study of Ce3+ activated chlorosulphate phosphors

The synthesis, X-ray diffraction (XRD) and photoluminescence characteristics in chloride based halosulphate phosphors, such as KZnSO4Cl: Ce; KMgSO4Cl: Ce; have been reported in this paper. The Ce3+ emission in KMgSO4Cl: Ce phosphor is more intense than KZnSO4Cl: Ce and it may be useful for scintillation applications

Thermoluminescence (TL) kinetics of CaSO4 and LiF standard materials: a comparative study

In this paper we present comparative reports on CaSO4 and LiF standard materials. CaSO4: Mn has a very high sensitivity but fading of the dosimetry peaks is relatively rapid. The CaSO4: Tm and CaSO4: Dy each has a stable glow peak at about 220°C.  LiF has an effective Z of 8.2 (of. 7.4 for tissue) and the energy response relative to tissue is good. Both the materials are available commercially

Photoluminescence properties of ZnWO4: Dy 3+ phosphor

Zinc tungstate (ZnWO4) exhibits interesting photoluminescent properties and ZnWO4 single crystal was first introduced for microwave devices, fiber optical communications, scintillating materials etc. In this paper reported the photoluminescence property of Dy3+ activated ZnWO4 synthesized by solid state rout at temperature 8500 C. Formation of compound was tested by X-ray diffraction pattern. The photoluminescence characteristic of Dy3+ doped ZnWO4 was studied by excitation and emission spectrum. PL excitation spectrum of ZnWO4:Dy3+ phosphor shows the broad excitation peaks ranging from 220 nm to 320 nm because of [WO6]6− group. The emission spectrum shows the peaks at 488 nm (blue) due to transition 4F9/2 →6H15/2 with broad background due to self emission of ZnWO4 and 575 nm (yellow) due to transition 4F9/2→ 6H13/2

Synthesis and thermoluminescence properties of gamma ray irradiated NaCl:Dy3+ phosphor

The synthesis and thermoluminescence (TL) properties of γ-irradiated NaCl:Dy3+ phosphors are reported in this paper. The NaCl:Dy3+ phosphors of different concentrations of Dy3+ doped in NaCl host are prepared by a wet chemical method. TL of all phosphors has been recorded for different γ-doses. The nature of variations of peak TL intensities is found to be sublinear with γ-irradiation dose and with the concentrations (0.05-0.5 mol%) of added Dy3+ in all the samples. The dose response curve is linear upto 0.6 kGy. Minimum fading is observed in the prepared sample

Study of crystal structure and PL properties of Na21Mg(SO4)10Cl3 :Ce halophosphor

A new phosphor Na21Mg(SO4)10Cl3 is very interesting for photoluminescence (PL) properties. In this paper we present results concerning the main PL properties of Na21Mg(SO4)10Cl3 activated by Ce at various concentrations. Polycrystalline Na21Mg(SO4)10Cl3: Ce phosphor prepared by wet chemical method have been studied for its PL characteristics showing Ce3+ emission at 341 nm at the excitation of 247 nm due to 5d → 4f transition, This is a good result for the materials which can be used in scintillation applications

Mechanoluminescnce and photoluminescence in gamma irradiated NaCl:Eu

Rare earth (RE) ions posses unique optical behavior when doped into phosphors. Eu2+ activated phosphors find use in many applications. Eu2+ emission arises from the lowest band of 4f6 5d configuration to 8S7/2  state of 4f7. NaCl having different concentrations of Eu were prepared by melt technique. The crystals of small sizes were cleaved from the grown crystal block and crushed to obtain powder or microcrystalline form of NaCl. Annealed samples were exposed to gamma rays at dose level 0.930kGy. Mechanoluminescnce (ML) was excited impulsively by dropping a load of mass 0.4 kg with the impact velocity of   0.6 ms-1 on to it. An intense ML peak was observed in its ML glow curve. ML intensity increases with increasing concentration of dopant. ML emission spectrum shows a single peak at 482 nm. Photoluminescence (PL) of the sample has also been recorded and a single peak at 427 nm was observed. Shift in ML and PL emission spectrum was observed