Synergistic effect of CeO2:La and CeO2:La-Gd nanostructures: Photoluminescence and electrical properties

Kırkgeçit R., Torun H. Ö., Öztürk E., Dokan F. K.

Optik, vol.272, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 272
  • Publication Date: 2023
  • Doi Number: 10.1016/j.ijleo.2022.170236
  • Journal Name: Optik
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC
  • Keywords: Ce, Electrical properties, Luminescence, Rare-earths
  • Kayseri University Affiliated: No


© 2022 Elsevier GmbHIn this study, the optical and conductivity properties of CeO2 ceramic oxide were investigated in terms of the contribution and synergistic effect. Undoped CeO2, CeO2:0.15La, and CeO2:0.10La0.05Gd compounds were synthesized via the hydrothermal method. Characterization studies were carried out using XRD, SEM, Raman spectroscopy, UV-Vis spectrophotometry, impedance spectroscopy, and photoluminescence spectrophotometry, respectively. It was determined that the synthesized compounds had a cubic crystal lattice structure. Raman spectroscopy was used to evaluate the concentration of oxygen vacancies in the samples. The void concentration in the CeO2:0.10La0.05Gd compound was calculated as 82 %. Gd positively affected oxygen vacancy formation. The conductivity of CeO2:0.10La0.05Gd at 700 °C was reported as 5.81 × 10−3 S/cm. The excitation and emission spectra of undoped CeO2, CeO2:0.15La, and CeO2:0.10La0.05Gd host crystals were investigated and compared. The results demonstrated that doping with La3+ and Gd3+ ions played an important role in greatly increasing the luminescence of CeO2 in the orange-red region. It was determined that with the synergistic effect, the Gd ion had increased the luminescence emission by 200-fold and the conductivity by 10-fold. In light of the data obtained (La-Gd), it was observed that it gave excellent results in terms of conductivity and luminescence properties with a synergistic effect.