Dy3+and Mn2+ emission in fluoride‐ and chloride‐based Na3(SO4)X (X = F or Cl) phosphors

Gedam, S.C.; Dhoble, S.J.; Moharil, S. V.

doi:10.1002/bio.1371

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…It has been suggested that the dopants do not change the nature of traps already existing in the host matrix, giving only different luminescence efficiencies . We have developed some phosphors such as Na 3 (SO 4 )F, Na 3 (SO 4 )Cl , NaMgSO 4 F , Na 6 (SO 4 ) 2 FCl , K 3 Ca 2 (SO 4 ) 4 F , KZnSO 4 Cl , and KMgSO 4 Cl by wet chemical and solid‐state synthesis methods. Rare‐earth ions‐doped mixed alkali/alkaline sulfate phosphors have well desired characteristics such as a high temperature glow peak, linear response with ionizing radiation exposure, negligible fading and an easy method of preparation.…”

Section: Introductionmentioning

confidence: 99%

Photo and thermoluminescence of KMgSO₄F: Ce and :Mn phosphors

Poddar¹,

Gedam²,

Dhoble

2014

Luminescence

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KMgSO4 F:Ce and KMgSO4 F:Mn phosphors were prepared by a wet chemical method and studied for their photoluminescence (PL) and thermoluminescence (TL) characteristics. PL emission of KMgSO4 F:Ce peaked at around 440 nm for the excitation at 377 nm due to 5d → 4f transition, while KMgSO4 F:Mn had a peak at 540 nm for an excitation at 363 nm and 247 nm due to (4) T1g → (6) A1g transition. The phosphors also showed good thermoluminescence characteristics when they were exposed to γ-rays at a 5 Gy dose at the rate of 0.36 kGyh(-1) . KMgSO4 F:Ce exhibited a single thermoluminescence (TL) peak at around 167 °C and KMgSO4 F:Mn also exhibited a single TL peak at around 177 °C. Possible trapping parameters such as order of kinetics (b), the geometrical factor (μg ), the frequency factor (s) and the activation energy were also evaluated by Chen's half width method. This article discusses fundamental PL and TL characteristics in inorganic fluoride material activated by Ce(3+) and Mn(2+) ions and prepared by a wet chemical method.

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Section: Introductionmentioning

confidence: 99%

Photo and thermoluminescence of KMgSO₄F: Ce and :Mn phosphors

Poddar¹,

Gedam²,

Dhoble

2014

Luminescence

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Photoluminescence enhancement in Na₃SO₄Cl:X (X = Ce³⁺, Eu³⁺ or Dy³⁺) material

Shinde

Dhoble²,

Gedam³

et al. 2015

Luminescence

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The compound Na3SO4Cl X (X = Ce(3+), Eu(3+) or Dy(3+)) prepared by the wet chemical method was studied for its photoluminescence (PL) and energy transfer characteristics. The PL from Na3 SO4 Cl:Ce(3+) shows strong emission at 322 nm at an excitation of 272 nm. Therefore, an efficient Ce(3+) → Dy(3+), Eu(2+) → Dy(3+) and Eu(2+) → Eu(3+) energy transfer had taken place in this host. The Dy(3+) emission caused by Ce(3+) → Dy(3+) energy transfer under ultraviolet (UV) wavelengths peaked at around 477 nm and 572 nm due to (4) F9/2 → (6) H15/2 and (6) H13/2 transitions with yellow-orange emission in the Na3 SO4 Cl lattice. An intense Dy(3+) emission was observed at 482 and 576 nm caused by the Eu(2+) → Dy(3+) energy transfer process and due to (4) F9/2 → (6) H15/2 and (4) F9/2 → (6) H13/2 transitions respectively. The Eu(3+) blue to red light emission caused by the Eu(2+) → Eu(3+) energy transfer peaked at 593 nm and 617 nm due to (5) D0 → (5) D3 transitions. The presence of trivalent Eu in Na3 SO4 Cl suggested the presence of Eu(3+) in the host compound that occupied two different lattice sites and that peaked at 593 and 617 nm due to (5) D0 → (7) F1 and (5) D0 → (7) F2 transitions respectively. The trivalent europium ion is very useful for studying the nature of metal coordination in various systems due to its non-degenerate emitting (5) D0 state. The present paper discusses the photoluminescence characteristics of Eu(2+) → Dy(3+) and Eu(2+) → Eu(3+) energy transfer. This compound may be useful as a lamp phosphor.

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