maryam hajiebrahimi

Novel luminous materials are always required in solid-state light-emitting diodes and displays applications. In this regard, the current study investigated the luminescence properties of cerium-doped zinc oxide/cadmium tungstate (ZnO/CdWO4: Ce) nanocomposite particles under proton, laser, and gamma-ray excitations. The XRD results revealed the simultaneous existence of monoclinic CWO and hexagonal ZnO. Doped nanocomposite particles under proton/laser irradiations displayed significant luminescence in the blue-green region compared with the pure nanocomposite. In addition, Thermo-Luminescence (TL) study of the doped pellet showed a stronger glow peak at 350-400 °C. According to the TEM, the doped nanoparticles had an average diameter of 70-150 nanometers. The existence of Zn, O, Cd, W, and Ce elements in the composites was confirmed by the EDX technique. The obtained results showed that the produced ZnO/CWO: Ce nanocomposite particles could be promising materials to be used in optoelectronic devices.

TLDs (thermoluminescent dosimeters) and ionizing ray sensors are well-known and essential instruments in a variety of medical fields. This work reports the investigation of structural, optical, and thermoluminescence (TL) properties of the Ce: CdWO4 and Ce: WO3 nanopowders prepared by the co-precipitation method. XRD and EDX-elemental mapping analyses were performed in order to confirm the crystalline phase and the presence of the elements in the synthesized samples. FESEM images showed that the 70 nm diameter spheroid-like particles and 204 nm diameter cubic-like particle were found in the Ce: CdWO4 and Ce: WO3 samples, respectively. The TL measurement was done by exposing the produced pellets to a gamma source. Prepared powders showed strong blue-green emissions at room temperature and a strong TL peak at 350-450 °C under UV and gamma-ray excitation respectively. Obtained results indicate that the nanopowders produced in this work have the potential for use as thermo/photoluminescent materials in photonic devices and detectors.