Low temperature combustion synthesis and photoluminescence mechanism of ZnO/ZnAl2O4 composite phosphors

The Influence of the Calcination Time on Synthesis of Nanomaterials with Small Size, High Crystalline Nature and Photocatalytic Activity in the TiO2 Nanoparticles Calcined at 500 °C

“…These emission bands are attributed to surface state emissions and are due to the recombination of the trapped electron-hole resulting from dangling bonds in the TiO 2 nanoparticles. Indeed, the band localized around 442 nm can be attributed to the transition of electrons through defect levels in the band gap, such as the oxygen gap that formed during sample preparation [38]. The emission band located around 534 nm is due to O 2− vacancies.…”

In-Depth Thermal, Microstructural and Photoluminescence Analysis of Mesoporous ZnO/ZnAl2O4-MMO: The Effect of Molar Ratio

“…In contrast, the DLE is originated as a result of electron transmission from defect states to the VB in the MMO matrix (O i , V o , Zn i , and V zn ). 41,42 As can be clearly observed from Fig. 8a, there is a strong reduction in the DLE spectrum intensity; this can be attributed to higher crystal formation at higher molar ratio.…”

A Comprehensive Study on the Effect of ZnO and ZnAl2O4 Nanoparticles on the Mechanical Properties of Epoxy Coating: Tensile and Hardness

“…Moreover, the absence of extra peaks in the ZnO NPs pattern ensures the high purity of the prepared nanoparticles, which is confirmed by implementing a refinement to the XRD pattern, performed on the MAUD program and shown in Figure 2 (c). On the other hand, the formation of face-centered cubic spinel structure of ZnAl 2 O 4 is confirmed by the presence of the diffraction peaks located at 31.26°, 36.97°, 44.97°, 49.2°, 55.92°, 59.43°, 65.37°, 74.2°, and 77.5°, which correspond to the planes of ( 220), ( 311), ( 400), ( 331), ( 422), ( 511), ( 440), (620), and (533), respectively, as shown in Figure 2 (b) (Xing et al, 2020). However, the appearance of additional peaks in the ZnAl 2 O 4 XRD pattern indicates the presence of an impurity phase, mainly attributed to the formation of zinc oxide (Xing et al, 2020).…”

“…On the other hand, the formation of face-centered cubic spinel structure of ZnAl 2 O 4 is confirmed by the presence of the diffraction peaks located at 31.26°, 36.97°, 44.97°, 49.2°, 55.92°, 59.43°, 65.37°, 74.2°, and 77.5°, which correspond to the planes of ( 220), ( 311), ( 400), ( 331), ( 422), ( 511), ( 440), (620), and (533), respectively, as shown in Figure 2 (b) (Xing et al, 2020). However, the appearance of additional peaks in the ZnAl 2 O 4 XRD pattern indicates the presence of an impurity phase, mainly attributed to the formation of zinc oxide (Xing et al, 2020). This is verified by the refinement to the XRD pattern, as seen in Figure 2 (d), where 88.2 and 11.8% of ZnAl 2 O 4 and ZnO phases, respectively, were obtained.…”