Two Photon Spectroscopy of Dithienyl Polyenes

1999 ◽  
Vol 561 ◽  
Author(s):  
Thomas M. Cooper ◽  
Paul A. Fleitz ◽  
Laura A. Sowards ◽  
Lalgudi V. Natarajan ◽  
Sean Kirkpatricky ◽  
...  
Keyword(s):  
Energy Gap ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Optical Limiters ◽  
Two Photon Absorption Coefficient ◽  
Photoinduced Charge ◽  
Transfer Mechanisms

ABSTRACTTo understand the properties of light-sensitive compounds used in optical limiters having photoinduced charge transfer mechanisms, we have investigated the photophysics of a series of di(2-thienyl-3,3'-butyl)polyenes. Spectroscopic measurements, including UV/Vis, fluorescence, fluorescence lifetimes, fluorescence quantum yields, triplet state lifetime, solvent effects and two-photon absorption coefficient were obtained as a function of the number of double bonds(n = 1-5). Trends in the data reflected the ordering, energy gap between and mixing of 1Bu* and 1Ag* excited state configurations.

Spectroscopy and Nonlinear Absorption of α, ω-dithienyi Polyenes

1997 ◽  
Vol 479 ◽  
Author(s):  
L. V. Natarajan ◽  
Laura A. Sowards ◽  
C. W. Spangler ◽  
N. Tang ◽  
P. A. Fleitz ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Steady State Fluorescence ◽  
Nonlinear Optical Absorption ◽  
Substituted Polyenes

AbstractThe photophysics and nonlinear absorption behaviour of a series of α, ω-dithienyl polyenes were studied in chloroform and n-octane solutions. Steady state fluorescence, fluorescence lifetime and quantum yield measurements were made. The fluorescence quantum yields were significantly lower than those of the corresponding ax,o-diphenyl polyenes. Among the dithienyl polyenes, 3,3′-substituted polyenes exhibited stronger fluorescence than those of the 2,2′-substituted. Nonlinear optical absorption experiments showed evidence of two photon absorption.

scholarly journals Photovoltage Formation Across Si P-N Junction Exposed to Laser Radiation

2018 ◽  
Vol 36 (2) ◽  
pp. 337-340
Author(s):  
Steponas Ašmontas ◽  
Jonas Gradauskas ◽  
Algirdas Sužiedélis ◽  
Aldis Šilénas ◽  
Edmundas Širmulis ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Energy Gap ◽  
Laser Intensity ◽  
Laser Wavelength ◽  
Photon Absorption ◽  
Separate Component ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Pair Generation ◽  
Two Photon Absorption Coefficient

Abstract Photovoltage formation across Si p-n junction exposed to laser radiation is experimentally investigated. Illumination of the junction with 1.06 μm wavelength laser radiation leads to formation of classical photovoltage Uphdue to intense electronhole pair generation. When the photon energy is lower than the semiconductor forbidden energy gap, the photovoltage U is found to consist of two components, U = Uf+ Uph. The first Uf is a fast one having polarity of thermoelectromotive force of hot carriers. The second Uphis classical photovoltage with polarity opposite to Uf. It is found that Ufis linearly dependent on laser intensity. The classical photovoltage is established to decrease with the rise of radiation wavelength due to decrease in two-photon absorption coefficient with wavelength. Predominance of each separate component in the formation of the net photovoltage depends on both laser wavelength and intensity

Synthesis of π-extended B ← N coordinated phenanthroimidazole dimers and their linear and nonlinear optical properties

2020 ◽  
Vol 49 (23) ◽  
pp. 7737-7746
Author(s):  
Mukundam Vanga ◽  
Shreenibasa Sa ◽  
Anupa Kumari ◽  
Anna Chandrasekar Murali ◽  
Prakash Nayak ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Conjugation Length ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Linear And Nonlinear

B ← N coordinated phenanthroimidazole dimers exhibit excellent fluorescence quantum yields in solution and conjugation length dependant two-photon-absorption properties.

Fluorenylethynylpyrene derivatives with strong two-photon absorption: influence of substituents on optical properties

2015 ◽  
Vol 3 (15) ◽  
pp. 3730-3744 ◽  
Author(s):  
C. Lavanya Devi ◽  
K. Yesudas ◽  
Nikolay S. Makarov ◽  
V. Jayathirtha Rao ◽  
K. Bhanuprakash ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Influence Of Substituents

A series of fluorenylethynylpyrene derivatives with large two-photon absorption cross-sections (≈250–2500 GM) and good fluorescence quantum yields (Φfl = 0.55–0.98) and with high two-photon brightness were synthesized.

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