The luminescence properties of Eu 3+ or Tb 3+ doped Lu 2 Gd 1 Ga 2 Al 3 O 12 phosphors for X-ray imaging

• Published in: Nuclear engineering and technology Vol. 55; no. 12; pp. 4642 - 4646
• Main Authors: M.J. Oh, Sudipta Saha, H.J. Kim
• Format: Journal Article
• Language: Korean
• Published: 2023
• Subjects: Tb^{3+}; Eu^{3+}; Lu_2Gd_1Ga_2Al_3O_{12}; Phosphor
• ISSN: 1738-5733; 2234-358X

The Tb3+ or Eu3+-doped Lu2Gd1Ga2Al3O12 phosphor were fabricated by funace at 1500 ℃ for 12 h using a solid state reaction. The XRD (X-ray diffraction_Panalytical X'Pert Pro) and FE-SEM (field emission scanning electron microscope) are measured to confirm the crystalline structure and surface morphology of the phosphor. The Tb3+-doped Lu2Gd1Ga2Al3O12 phosphor emits the lights in 470~650 nm wavelength range due to transitions from 5D4 to 7Fj. Therefore, it shows the green region in the CIE chromaticity diagram under both UV and X-rays excitations. The Eu3+-doped Lu2Gd1Ga2Al3O12 phosphor emits the lights in 550~750 nm wavelength range because of 5Di to 7Fj. The emission is confirmed to be in the red region using the CIE chromaticity diagram. The Tb3+ or Eu3+-doped Lu2Gd1Ga2Al3O12 phosphor shows the characteristic f-f transition with a long decay time, which is about several milliseconds. They have the high efficiency of light emission for X-ray because of their high effective Z number (Zeff = 58.5) and density. Therefore, they are very much promising phosphors for X-ray imaging application in medical fields.