Synthesis of KNaSO4:Tb3+ and MgSO4:Dy3+ phosphors for lyoluminescence dosimetry

KNaSO4 microphosphor doped with Ce,Gd and Ce,Tb and prepared by a wet chemical method was studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) characterization. KNaSO4 has a 5-µm particle size detected by SEM. KNaSO4:Ce(3+),Tb(3+) showed blue and green emission (at 494 nm, 557 nm, 590 nm) of Tb(3+) due to (5)D(4) → (7)F(J) (J = 4, 5, 6) transitions. KNaSO4:Ce(3+),Gd(3+) showed luminescence in the ultraviolet (UV) light region at 314 nm for an excitation at 271 nm wavelength. It was observed that efficient energy transfer took place from Ce(3+) → Gd(3+) and Ce(3+) → Tb(3+) sublattices indicating that Ce(3+) could effectively sensitize Gd(3+) or Tb(3+) (green emission). Ce(3+) emission weakened and Gd(3+) or Tb(3+) enhanced the emission significantly in KNaSO4. This paper discusses the development and understanding of photoluminescence and the effect of Tb(3+) and Gd(3+) on KNaSO4:Ce(3+).

Section: Methodssupporting

confidence: 53%

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

Manik¹,

Gedam²,

Dhoble

2015

“…When g-irradiated microcrystals are dissolved in a fixed volume (3 mL) of distilled water, initially the LL intensity increases with time, attains a maximum value I m at a particular time tm, then decreases and finally disappears. This is supported by equations (1), (5) and (6).…”

Section: Resultsmentioning

confidence: 57%

“…Uppadhyay et al . (6) reported the KNaSO 4 :Tb 3+ and MgSO 4 :Dy 3+ phosphors to be suitable as lyoluminescence dosimetry phosphors for ionizing radiation. KNaSO 4 :Tb 3+ phosphors were synthesized by melt technique with different concentrations of Tb 3+ ions, and MgSO 4 :Dy 3+ phosphor was prepared by solid‐state diffusion (7).…”

Section: Introductionmentioning

confidence: 99%

“…KNaSO 4 :Tb 3+ phosphors were synthesized by melt technique with different concentrations of Tb 3+ ions, and MgSO 4 :Dy 3+ phosphor was prepared by solid‐state diffusion (7). The PL and LL characteristics have been reported for dosimetry characterization (6). Dhoble (8) developed an Eu‐activated KNaS0 4 phosphor for LL dosimetry and co‐related the thermoluminescence and lyoluminescence results of this phosphor for radiation dosimetry.…”

Section: Introductionmentioning

confidence: 99%

“…LL is a luminescence measurement technique, and it is very interesting for the development of radiation dosimetry as well as in the analysis of the mechanism of color centers at liquid-solid interfaces and radiolysis products during the high-radiation irradiation of solids. Uppadhyay et al (6) reported the KNaSO 4:Tb 3+ and MgSO4:Dy 3+ phosphors to be suitable as lyoluminescence dosimetry phosphors for ionizing radiation. KNaSO4:Tb 3+ phosphors were synthesized by melt technique with different concentrations of Tb 3+ ions, and MgSO4:Dy 3+ phosphor was prepared by solid-state diffusion (7).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Studies on the mass and temperature dependence of lyoluminescence intensity of microcrystalline powder of KCl

Nayar¹,

Chowdhary²,

Bhujbal

et al. 2010

The temperature and mass dependence of lyoluminescence intensity of γ-irradiated colored potassium chloride powder have been studied using a photomultiplier tube connected to an x-y recorder. The peak lyoluminescence intensity increases with increasing amount of solute added up to 50 mg and then tends to saturate. The lyoluminescence (LL) glow curves with mass of KCl microcrystals show that initially the LL intensity increases with time and then decreases exponentially with time. The decay time consists of two components for all the masses. The dependence of decay time, especially the longer component on mass, has been investigated. The temperature dependence of LL intensity shows that initially the peak LL intensity increases with temperature up to 60°C, and then decreases with further increase in temperature. The decay time tends to decrease with increasing temperature. An explanation for the experimental results has been attempted.

Photoluminescence of Dy³⁺ activator sensitized by Ce³⁺ in KNaSO₄ microphosphor

Manik¹,

Gedam²,

Dhoble

2014

The KNaSO4 microphosphor doped with Ce or Ce and Dy prepared by a wet chemical method was studied by scanning electron microscopy (SEM) and characterized by photoluminescence (PL). KNaSO4 has a 5-µm particle size detected by SEM. The KNaSO4:Ce(3+) spectrum shows a single emission band at 327 nm for an excitation of 269 nm due to 5d → 4f transition of the Ce(3+) ion, indicating weak spin orbiting coupling of the Ce(3+) ground state. Efficient energy transfer takes place from Ce(3+) → Dy(3+) sublattices indicating that Ce(3+) could effectively sensitize Dy(3+) (orange emission) and that the Ce(3+) emission weakens significantly in KNaSO4. The powder form of prepared KNaSO4 show negligible change in morphologies and hence no effect on the particle size. The characteristics of this powder could provide improved luminescence properties. The development and understanding of this photoluminescence and the effect of Dy(3+) on KNaSO4:Ce(3+) are discussed.