Highly concentrated ZnO sol with ultra-strong green emission

Impact of nanostructured thin ZnO film in ultraviolet protection

“…As reported in previous studies, [33][34][35][36] both sol and dopant ion concentrations affect the optical properties of thin ZnO films. Moreover, the absorbance peak of ZnO sol changed considerably due to ZnAc-concentration variation.…”

Highly concentrated IZO colloidal nanocrystals with blue/orange/red three-colors emission

“…Experimental results have shown that the dopant concentration has a critical role on the optical properties of ZnO nanostructured materials [8][9][10][11]. Therefore, the highly concentrated (2M) IZO sol with different dopant concentrations were synthesized for the first time.…”

Strong blue emission from ZnO nanocrystals synthesized in acetone-based solvent

“…The other peaks at around 1083, 1468, 2852, and 2920 cm −1 are due to C-H bending and stretching [12,13], and the broad absorption peak at 3438.26 cm −1 can be attributed to the characteristic absorption of hydroxyls groups [13]. Comparing FTIR spectra of the samples synthesized using acetone (0.5 M) and Ethanol (2 M) in our last works [14], indicated that Zn-O bond has approximately the same concentration in both sample ( Figure 1). The other component is the visible emission (also called deep-level emission) related to oxygen vacancies, but the corresponding mechanism is controversial and not very clear so far.…”

“…As discussed by Djurisic et al [21], crystalline defects such as zinc or oxygen vacancies can be the sources of visible emission, as depicted in Figure 3b [22,23]. So green emission observed in PL spectrum of 2M Zinc solution synthesized with Ethanol [14] is contributed to the Oxygen vacancies while this peak is obviously reduced in PL spectrum of 0.5 M Zinc solution prepared by using Acetone. This means the density of oxygen vacancies is decreased by the use of Acetone as a solvent.…”