UV ray-induced thermoluminescence study of Y2SiO5:Ce3+ phosphor

Abstract

This paper reports thermoluminescence (TL) properties of Ce 3? doped yttrium silicate phosphor. The phosphor is synthesized by a solid state reaction method which is suitable for large scale production. Starting materials used for sample preparation were Y 2 O 3 , SiO 2 , CeO 2 and a fixed concentration of boric acid used as a flux. The prepared phosphors for different concentrations of Ce 3? were examined by observing their TL glow curves for UV irradiation (254-nm source). The samples show a well resolved broad peak covering a temperature range of 50-375°C. The kinetic parameters such as activation energy, order of kinetics and frequency factor were calculated by the peak shape method. Most of the peaks show general order kinetics. The effect of UV exposure on TL was also examined and a linear response to dose was shown, indicating the sample may be useful for a TL dosimeter. The kinetic parameters were calculated using a computerized glow curve de-convolution (CGCD) technique.

Visible Luminescence of Y2SiO5:Tb3+ Powders Excited by Simultaneous Absorption of up to Five Photons in the Short Wavelength IR Band

“…On the other hand, the bands at 1017 cm −1 , 956, 870, and 489 cm −1 are attributed to the Si−O−Si antisymmetric and symmetric stretching vibrations of the silicate (SiO 4 ) group. 23,26 Finally, the lowest energy bands, centered at 560, 636, and 717 cm −1 , are associated with vibrational modes related to Y−O coupling. 26,27 The room-temperature Raman spectrum of the heat-treated Y 2 SiO 5 :Tb 3+ powder, annealed at 1050 °C, in the range of 400−1100 cm −1 is shown in ).…”

“…23,26 Finally, the lowest energy bands, centered at 560, 636, and 717 cm −1 , are associated with vibrational modes related to Y−O coupling. 26,27 The room-temperature Raman spectrum of the heat-treated Y 2 SiO 5 :Tb 3+ powder, annealed at 1050 °C, in the range of 400−1100 cm −1 is shown in ). The Raman peaks in the range of 800− 1100 cm −1 are related to tetrahedral vibrations units (SiO 4 ), 23−27 and the lower energy band at 470 cm −1 are due to the bonding vibrations of RE ions with oxygen RE-O.…”

“…Notice that, after heat treatment at 1050 °C, the absorption peaks associated with the organic compounds (∼1250–1700 cm –1 ) are significantly suppressed. On the other hand, the bands at 1017 cm –1 , 956, 870, and 489 cm –1 are attributed to the Si–O–Si antisymmetric and symmetric stretching vibrations of the silicate (SiO 4 ) group. , Finally, the lowest energy bands, centered at 560, 636, and 717 cm –1 , are associated with vibrational modes related to Y–O coupling. , The room-temperature Raman spectrum of the heat-treated Y 2 SiO 5 :Tb 3+ powder, annealed at 1050 °C, in the range of 400–1100 cm –1 is shown in Figure . It is observed that the sample shows vibrational modes from 450 to 1100 cm –1 , characteristic to the Y 2 SiO 5 structure.…”

“…The bands in the region 500–800 cm –1 are related to Y–O vibrations (octahedral Y–O 6 ). The Raman peaks in the range of 800–1100 cm –1 are related to tetrahedral vibrations units (SiO 4 ), − and the lower energy band at 470 cm –1 are due to the bonding vibrations of RE ions with oxygen RE-O. − …”