Role of the energy transfer in the optical properties of undoped and Er-doped interacting Si nanocrystals

2001 ◽  
Vol 89 (1) ◽  
pp. 264-272 ◽  
Author(s):  
Francesco Priolo ◽  
Giorgia Franzò ◽  
Domenico Pacifici ◽  
Vincenzo Vinciguerra ◽  
Fabio Iacona ◽  
...  
Keyword(s):  
Optical Properties ◽  
Energy Transfer ◽  
Si Nanocrystals ◽  
Er Doped

OPTICAL PROPERTIES OF Er AND Si-NANOCRYSTAL CO-DOPED SiO2 FILMS AT A HIGH Er CONCENTRATION REGIME

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2598-2603
Author(s):  
KIMIHISA MATSUMOTO ◽  
KENJI IMAKITA ◽  
MINORU FUJII ◽  
SHINJI HAYASHI
Keyword(s):  
Optical Properties ◽  
Energy Transfer ◽  
Amorphous Alloy ◽  
Excitation Light ◽  
Sio2 Films ◽  
Si Nanocrystals ◽  
Si Nanocrystal ◽  
Pl Intensity ◽  
Co Doped

Photoluminescence (PL) properties of Er and Si nanocrystals co-doped SiO 2 films are studied in a wide Er concentration range. In the Er concentration range of less than 3 at%, Er 3+ was excited by the energy transfer from Si nanocrystals. Above this concentration, Si nanocrystals and Er do not exist independently but amorphous or crystallin alloys of Si-Er-O are formed. In this region Er can be excited only by directly absorbed excitation light. The highest PL intensity is observed in the Er concentration range where an amorphous alloy of Si-Er-O is formed.

Adiabatic large polarons in anisotropic molecular crystals

2011 ◽  
Vol 35 (1) ◽  
pp. 15-27
Author(s):  
Zoran Ivić ◽  
Željko Pržulj
Keyword(s):  
Energy Transfer ◽  
Effective Mass ◽  
Molecular Crystals ◽  
Single Chain ◽  
Proper Understanding ◽  
One Dimensional ◽  
Interchain Coupling ◽  
Large Polaron ◽  
The One

Adiabatic large polarons in anisotropic molecular crystals We study the large polaron whose motion is confined to a single chain in a system composed of the collection of parallel molecular chains embedded in threedimensional lattice. It is found that the interchain coupling has a significant impact on the large polaron characteristics. In particular, its radius is quite larger while its effective mass is considerably lighter than that estimated within the one-dimensional models. We believe that our findings should be taken into account for the proper understanding of the possible role of large polarons in the charge and energy transfer in quasi-one-dimensional substances.

scholarly journals Role of the Anilinium Ion on the Selective Polymerization of Anilinium 2-Acrylamide-2-methyl-1-propanesulfonate

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2349
Author(s):  
Alain Salvador Conejo-Dávila ◽  
Marco Armando Moya-Quevedo ◽  
David Chávez-Flores ◽  
Alejandro Vega-Rios ◽  
Erasto Armando Zaragoza-Contreras
Keyword(s):  
Cyclic Voltammetry ◽  
Optical Properties ◽  
Thermal Properties ◽  
Free Radical ◽  
1H Nmr ◽  
Molecular Interactions ◽  
13C Nmr ◽  
Oxidative Polymerization ◽  
Cyclic Voltammetry Analysis

The development of anilinium 2-acrylamide-2-methyl-1-propanesulfonate (Ani-AMPS) monomer, confirmed by 1H NMR, 13C NMR, and FTIR, is systematically studied. Ani-AMPS contains two polymerizable functional groups, so it was submitted to selective polymerization either by free-radical or oxidative polymerization. Therefore, poly(anilinium 2-acrylamide-2-methyl-1-propanesulfonic) [Poly(Ani-AMPS)] and polyaniline doped with 2-acrylamide-2-methyl-1-propanesulfonic acid [PAni-AMPS] can be obtained. First, the acrylamide polymer, poly(Ani-AMPS), favored the π-stacking of the anilinium group produced by the inter- and intra-molecular interactions and was studied utilizing 1H NMR, 13C NMR, FTIR, and UV-Vis-NIR. Furthermore, poly(Ani-AMPS) fluorescence shows quenching in the presence of Fe2+ and Fe3+ in the emission spectrum at 347 nm. In contrast, the typical behavior of polyaniline is observed in the cyclic voltammetry analysis for PAni-AMPS. The optical properties also show a significant change at pH 4.4. The PAni-AMPS structure was corroborated through FTIR, while the thermal properties and morphology were analyzed utilizing TGA, DSC (except PAni-AMPS), and FESEM.

scholarly journals Tuning resonance energy transfer with magneto-optical properties of graphene

2021 ◽  
Vol 103 (17) ◽  
Author(s):  
P. P. Abrantes ◽  
G. Bastos ◽  
D. Szilard ◽  
C. Farina ◽  
F. S. S. Rosa
Keyword(s):  
Optical Properties ◽  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy

Tuning Optical Properties of Nitrogen-Doped Carbon Dots Through Fluorescence Resonance Energy Transfer Using Rhodamine B for Ratiometric Sensing of Mercury ion

2021 ◽  
Author(s):  
Alagan Muthurasu ◽  
V GANESH
Keyword(s):  
Optical Properties ◽  
Energy Transfer ◽  
Rhodamine B ◽  
Carbon Dots ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Nitrogen Doped ◽  
Physical Chemical ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Carbon dots (CDs) exhibiting fluorescence property are generally derived from carbonaceous materials and possessing ultra small size with various exciting physical, chemical and photo-properties that have been used in many...

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