Effect of Environments on Optical Properties of Chemically Prepared Si Nanoparticles

Mixed bismuth‐antimony‐based double perovskite nanocrystals for solar cell application

“…Absorption spectrum of Cs 2 AgBiBr 6 NCs (host material) is shown in Figure 6A. A narrow band with a peak at 431 nm tailing up to 652 nm is observed 38 . The optical properties of Cs 2 AgBi 0.6 Sb 0.4 Br 6 and Cs 2 AgBi 0.6 Sb 0.4 (Br 0.278 I 0.722 ) 6 DP NCs in the UV‐Vis (350‐850 nm) region in various organic solvents at room temperature are also studied.…”

“…After anion exchange (Br to Br/I), there is a significant change in the shape and position of the band in the optical spectrum of (Cs 2 AgBi (1‐x) Sb X = 0.4 (Br 0.278 I 0.722 ) 6 dispersed in the various dispersing solvent. It is to be noted that change in band shape offers some measure of the relative coordinating ability of the dispersing agent with Cs 2 AgBi (1‐ x ) Sb X = 0.4 (Br 0.278 I 0.722 ) 6 NCs 38‐40 . The dispersing agent's coordination nature influences the peak position, band shape, and intensities.…”

The Role of Solvent Environment on the Optical Behavior of Chemically Synthesized Silicon Nanoparticles

“…Journal of Spectroscopy and ethanol, this transition is broadened and splitted into two bands with maxima at 228 nm and 260 nm and 220 nm and 260 nm, respectively. Such splitting may be due to the crystal field effect [19]. The absorption spectra in DMSO and DMF show a broad band but in dioxane, this broad band shifted to higher wavelength.…”

“…Previously, some coworkers in our laboratories studied the emission spectra that Si-NPs fabricated by chemical etching technique in different organic solvents [12,18,19]. They examine the effects of solvents and temperature on the optical absorption spectra and luminescence spectra of Si-NPs, in which the emission and absorption properties of Si-NPs were tuned by altering the environment (solvents) because of electrostatic interaction of various organic solvents with Si-NPs [19]. The band shapes of the Si-NPs show remarkable changes in passing from noncoordinating solvent (chloroform) to various coordinating solvents, which is the result of change in the environment around Si-NPs in various solutions and suggests coordination of solvent molecule(s), in some cases.…”