Atomistic tight-binding theory of structural and optical properties in PbX (X = S, Se, and Te) nanocrystals

2020 ◽  
Vol 35 (9) ◽  
pp. 1190-1196 ◽  
Author(s):  
Worasak Sukkabot
Keyword(s):  
Optical Properties ◽  
Tight Binding ◽  
Binding Theory ◽  
Structural And Optical Properties ◽  
Image Position

Abstract

The effect of radio frequency power on the structural and optical properties of a-C:H films prepared by PECVD

2017 ◽  
Vol 32 (07) ◽  
pp. 1231-1238 ◽  
Author(s):  
Yequan Xiao ◽  
Xinyu Tan ◽  
Lihua Jiang ◽  
Ting Xiao ◽  
Peng Xiang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Radio Frequency ◽  
Radio Frequency Power ◽  
Structural And Optical Properties ◽  
Image Position ◽  
Frequency Power

Abstract

Effect of Cis-Backbone on Optical Properties of Polyphenylacetylene

2010 ◽  
Vol 428-429 ◽  
pp. 483-486
Author(s):  
Bao Gai Zhai ◽  
Yuan Ming Huang
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Intermolecular Interactions ◽  
Density Of States ◽  
Tight Binding ◽  
Binding Theory ◽  
Concentrated Solutions ◽  
Fluorescence Studies ◽  
Excited Complex ◽  
Blue Photoluminescence

By controlling the temperature of chemical reaction, we synthesized four polyphenylacetylene samples, in which the percentages of cis configurations were determined to be 65, 75, 85 and 100%, respectively. Ultraviolet-visible and fluorescence studies show that the cis-configured backbones have posed significant effects on the optical absorption and fluorescence of the polyphenylacetylenes. Upon the 325-nm excitation, the dilute solutions of these cis-polyphenylacetylenes give off weak fluorescence with their peak located at about 390 nm, but the concentrated solutions of the polymer can give off strong orange-red fluorescence with their peak located at about 600 nm. With Hückel tight binding theory, both the E-k dispersion relations and the density of states were calculated for cis-polyphenylacetylene. Our results suggest that the blue photoluminescence of polyacetylenes origins from the backbone enhanced -conjugation of the phenyl chromophors in the polymer, and that intermolecular interactions can occur in the excited complex of the polymer.

Structural and optical properties of graphene from green carbon source via thermal chemical vapor deposition

2016 ◽  
Vol 31 (13) ◽  
pp. 1947-1956 ◽  
Author(s):  
M.J. Salifairus ◽  
S.B. Abd Hamid ◽  
T. Soga ◽  
Salman A.H. Alrokayan ◽  
Haseeb A. Khan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Carbon Source ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Structural And Optical Properties ◽  
Thermal Chemical Vapor Deposition ◽  
Image Position

Abstract

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