Gd2O2S:Eu3+ Nanophosphors: Microwave Synthesis and X-ray Imaging Detector Application

Abstract

Red-emitting Gd 2 O 2 S:Eu 3+ nanophosphors were successfully prepared using a microwave irradiation method followed by hydrogenation treatment. The optimum calcination temperature (900 °C) was determined by thermogravimetric-differential scanning calorimetry. The X-ray diffraction results showed that all the samples consisted of the pure hexagonal Gd 2 O 2 S:Eu 3+ phase. The field emission scanning electron microscopy images showed that the Gd 2 O 2 S:Eu 3+ nanophosphors were spherical, and their average particle diameter increased parallel with the microwave irradiation power. The photoluminescence spectra (under 325-nm excitation) of the samples exhibited red emission corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. A Gd 2 O 2 S:Eu 3+ nanophosphor screen film was fabricated using the particlebinder sedimentation method. The result shows that the luminance of the Gd 2 O 2 S:Eu 3+ nanophosphor screen film increased with an increase in the X-ray energy. Hence, this film would become one of the potential candidate for future imaging applications.

The role of lanthanide luminescence in advancing technology

“…In contrast to the Eu 3+ complexes, the Colombian peso elects to use a different red emitter entirely. The splitting pattern is reminiscent of an oxysulde composition, such as Y 2 O 2 S or Gd 2 O 2 S. 220,221 When doped with Eu 3+ , these materials are commonly used in lighting applications, such as cathode ray tubes and imaging detectors as discussed above. [222][223][224] Eu 2+doped oxysulde compositions are extremely photostable, which is why their widespread use in a variety of different industrial phosphor applications is so common.…”