Development of orange-red emitting phosphors and studies of thermoluminescence characteristics of KMgSO4F material

The phosphors prepared by wet chemical method are studied for their photoluminescence (PL) and thermoluminescence (TL) characteristics. The paper discuses the results on KMgSO4F:Ce halosulfate phosphor co-doped with trivalent rare-earths Dy or Eu which improved luminescence properties. The Dy3+ emission is peaking at 480 nm and 576 nm for an excitation of 390 nm due to 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions in blue and yellow-orange region of visible range, whereas Eu3+ is at 590 nm and 612 nm (orange and red region) due to 5D0→7F1 and 5D0→7F2 transitions of Eu3+ ion. TL glow curves of KMgSO4F pure, KMgSO4F:Dy, KMgSO4F:Eu show single peaking at around 154 °C, 172 °C 180 °C, respectively. TL glow curves of KMgSO4F:Ce, Dy show two peaks at the temperatures 202 °C and 370 °C, whereas KMgSO4F:Ce,Eu shows single peak which is located at around 198 °C when they exposed to γ-rays for 5 Gy at the rate of 0.36 kGy h−1.