Effect of the Eu³⁺ Addition on Photoluminescence and Microstructure of ZnO–CdO–TeO₂ Glasses

Abstract

In this work, the role of europium doping of glasses formulated in the ternary system ZnO-CdO-TeO 2 is described. The Eu-doped oxide glasses were prepared by the conventional melt-quenching method and by using three different compositions. Structural studies reveal that there exists a good affinity between Cd and some rare earth (RE) ions to form the crystalline phase. The X-ray diffraction (XRD) diagrams display that the structure of these glasses is amorphous and with the increase in CdO content and the compatibility of Eu 3+ , there is a tendency to form nanocrystals of CdTe 2 O 5 . The scanning electron microscopic (SEM) observation of their microstructure confirms the presence of phase separation. Differential thermal analysis (DTA) of these glasses showed small exothermic peaks noted around 450°C for the V2 glass and 480°C for V1 and V3 glasses, which could be attributed to the formation of these crystals. The infrared spectra showed a main absorption band around 800-600 cm À1 corresponding to the Te-O stretching mode in TeO 4 and TeO 3 groups. By optical absorption (OA), the band gap (E g ) for each glass was determined; these values were 3.27, 3.14, and 3.3 eV for the V1-V3 glasses, respectively. Furthermore, the presence of Eu 3+ was detected in the 370-470 nm short-range wavelengths. The photoluminescence (PL) experiments of the glasses showed light emission due to the following transitions:

Spectroscopic Studies of the Behavior of Eu3+on the Luminescence of Cadmium Tellurite Glasses

“…The present investigation is part of a wide research about the study of the ZnO-CdO-TeO 2 system doped with rare earth ions. One study has been published earlier in which the structural characterization and optical (PL) and thermal analysis of the matrix containing Eu 3+ ion was reported [16]. This research shows the influence of varying the Eu 3+ ions content on the photoluminescence properties of a single composition of a ZnO-CdO-TeO 2 glass.…”

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

“…matrix containing ytterbium and terbium [32,33], neodymium [34], and europium ions [35] are reported.…”

“…The obtained E g values were 3.47, 3.33, and 3.49 eV for the V1, V2, and V3, respectively. The E g for the starting oxides (ZnO, CdO, and TeO 2 ) is 3.3, 2.5, and 3.3 eV, respectively [35]. Figure 21 shows the PL intensity of the samples Yb118, Yb127, and Yb136.…”