Study of luminescence and effect of Dy³⁺ on NaMgSO₄Cl:Ce chlorosulphate phosphor

Abstract

Chlorosulphate NaMgSO4 Cl phosphor doped with Ce(3+) and co-doped by Dy(3+) prepared by the wet chemical method was studied for its photoluminescence and thermoluminescence (TL) characteristics. The emission spectrum of Ce(3+) shows dominant peaks at 346 nm (excitation 270 nm) due to 5d → 4f transition. Efficient energy transfer occurs from Ce(3+) → Dy(3+) ions. Dy(3+) emission at 485 nm and 576 nm is due to (4) F9/2 → (6) H15/2 and (4) F9/2 → (6) H13/2 transitions of Dy(3+) ion respectively. The TL glow curves of NaMgSO4 Cl:Ce and Ce,Dy have been recorded for various concentrations at a heating rate of 2 °C/s irradiated by γ-rays at a dose rate of 0.995 kGy/h for 1 Gy, which peaks at about 241 °C and 247-312 °C respectively. Further, in changing the concentration level, the general structure of the intensity is found to increase. The main property of this phosphor is its sensitivity even for low concentrations of rare earth ions and low γ-ray dose. There is still scope for higher doses of γ-radiation. The phosphor presented may be used as a lamp phosphor as well as for TL studies.

Boosted UV emission at 349 nm from mesoporous ZnS

“…Modern technology demands new UV sources especially for scintillation [1], for read heads to reduce data storage space, and for bio-imaging applications [2]. ZnS is a semiconductor material with large exciton binding energy of about 40 meV at room temperature [3].…”

Synthesis and characterization of novel Na15(SO4)5F4Cl:Ce3+halosulfate phosphors

“…The preparation techniques and properties of various TL materials have been studied to date and it is observed that mixed sulfate is an excellent class of TL phosphor, especially when doped with suitable activators . Figure shows the TL glow curves of Na 15 (SO 4 ) 5 F 4 Cl:Ce 3+ phosphors for different concentrations of Ce 3+ ions.…”

Energy transfer between Ce3+ → Gd3+ or Tb3+ in KNaSO4 microphosphor

“…Due to its high energetic position, this emission could only be observed in lattices with optical absorption at high energy. The Gd 3+ ion, which has strong UV absorption, can act as sensitizer if the Ce 3+ emission in the given host matches the Ce 3+ absorption . Quite often energy transfer from the 6 P manifold of Gd 3+ to other RE ions or host lattice group occurs.…”