Design and Synthesis of Dendrimers with Enhanced Two-Photon Absorption

1999 ◽  
Vol 561 ◽  
Author(s):  
E. H. Elandaloussi ◽  
C. W. Spangler ◽  
C. Dirk ◽  
M. Casstevens ◽  
D. Kumar ◽  
...  
Keyword(s):  
Cross Sections ◽  
Photon Absorption ◽  
Preliminary Evaluation ◽  
Third Order ◽  
Two Photon Absorption ◽  
Design And Synthesis ◽  
Two Photon ◽  
Repeat Units ◽  
State Measurement ◽  
Bipolaron State

ABSTRACTModel dendrimers based on bis-(diphenylamino)stilbene repeat units have been synthesized and shown to have very stable bipolaronic charge states. Calculations at the AM-1 level predict two orders magnitude enhancement in the third-order nonlinearity in going from the neutral to bipolaron state. Measurement of two-photon cross-sections for PPV dimers with attached diphenylamino donor groups show enhanced two-photon cross-sections for ns pulses. Preliminary evaluation of one of the model dendrimers indicates even larger two-photon cross-sections are possible.

PHOTOGENERATION OF HIGHLY ABSORBING TRANSIENT CHARGE STATES FROM MODEL DENDRITIC MACROMOLECULES BASED ON BIS-(DIPHENYLAMINO)DIPHENYLPOLYENE REPEAT UNITS

2000 ◽  
Vol 09 (04) ◽  
pp. 469-480 ◽  
Author(s):  
AMY HYFIELD ◽  
WENDI SONNENBERG ◽  
YANONG HAN ◽  
LEE H. SPANGLER ◽  
El HADJ ELANDALOUSSI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Transient State ◽  
Laser Pulses ◽  
Photon Absorption ◽  
Spectroscopic Techniques ◽  
New Materials ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Repeat Units ◽  
Charge States

Bis-(diphenylamino)diphenylpolyenes form exceptionally stable, highly absorbing, bipolaronic charge states when oxidatively doped in solution, even at the stilbene level. These chromophores also display exceptionally large two-photon absorption cross-sections for ns laser pulses. 1,2-Bis-(diphenylamino)-E-stilbene moieties have now been incorporated into 3-arm and four-arm dendrimer structures as formal repeat units. These new G-0 model dendrimers also form exceptionally stable, highly-absorbing bipolaronic charge states when oxidized in solution. As such these new materials are attractive candidates for various photonic applications which depend on the fast photogeneration of highly absorbing transient states. In the current study we have demonstrated that such states can indeed be photogenerated from the model dendrimers in solution in the presence of efficient electron acceptors, such as C 60. In order to follow both the generation and decay of these excited state transient species, new spectroscopic techniques have been developed that have unique capabilities for examining transient state formation and subsequent dynamics.

Theoretical study of one- and two-photon absorption properties of olefin-linked paracyclophane oligomers

2006 ◽  
Vol 84 (9) ◽  
pp. 1114-1123 ◽  
Author(s):  
Xiang-Biao Zhang ◽  
Ji-Kang Feng ◽  
Ai-Min Ren ◽  
Chia-Chung Sun
Keyword(s):  
Cross Sections ◽  
Molecular Structures ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Repeat Units ◽  
The One ◽  
Good Transparency ◽  
The Relationship

The electronic structures and the one- and two-photon absorption (TPA) properties of two series of the olefin-linked paracyclophane (pCp) oligomers have been studied using AM1 and ZINDO-SOS methods. The relationship between the TPA cross sections and the molecular chain length is obtained. The maximum TPA cross section increases in proportion to Nα (N denotes the number of repeat units) and the values of α depend on different molecular structures. The olefin-linked pCp oligomers, which have good transparency and large TPA cross sections, are promising candidates for TPA materials.Key words: two-photon properties, paracyclophane oligomer, AM1, ZINDO-SOS.

The Design and Synthesis of New Organic Molecules with Large Two-Photon Absorption Cross-Sections for Optical Limiting Applications

1997 ◽  
Vol 479 ◽  
Author(s):  
B. A. Reinhardt ◽  
L. L. Brott ◽  
S. J. Clarson ◽  
R. Kannan ◽  
A. G. Dillard
Keyword(s):  
Cross Sections ◽  
Nonlinear Optical ◽  
Organic Molecules ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Design And Synthesis ◽  
Two Photon ◽  
Nlo Property

AbstractThe molecular structure / nonlinear optical (NLO) property relationship is explored with seven recently synthesized chromophores. Two symmetrical compounds were made using electron withdrawing groups separated by an electron rich core while five asymmetrical molecules were developed using electron donating and withdrawing groups coupled by a it electron bridging group. Pendant chains were added to some of the chromophores to improve processibility. Their syntheses are described and their optical limiting properties discussed.

Theoretical studies on the one- and two-photon absorption of tetrabenzoporphyrins and phthalocyanines

2004 ◽  
Vol 82 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xin Zhou ◽  
Ai-Min Ren ◽  
Ji-Kang Feng ◽  
Xiao-Juan Liu
Keyword(s):  
Dipole Moment ◽  
Cross Sections ◽  
Density Functional ◽  
Transition Dipole Moment ◽  
Photon Absorption ◽  
Transition Dipole ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
The One

The one-photon absorption (OPA) properties of tetrabenzoporphyrins (TBPs) and phthalocyanines (Pcs) were studied using the semiempirical ZINDO method and time-dependent density functional theory (TDDFT), respectively. The compared results confirmed that the semiempirical ZINDO method was reasonably reliable when calculating the OPA of tetrabenzoporphyrins and phthalocyanines. On the basis of the OPA properties obtained from the ZINDO method, two-photon absorption (TPA) properties of two series of molecules were investigated, using ZINDO and sum-over-states (SOS) methods. The results showed that the TPA cross-sections of all molecules were in the range of 220.6 × 10–50 – 345.9 × 10–50 cm4·s·photon–1, which were in the same order of magnitude as the values reported in the literature. The relatively larger δ(ω) value for Pcs with respect to that for corresponding TBPs originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment between S0 and S1 and the transition dipole moment between S1 and S5.Key words: two-photon absorption, ZINDO, sum-over-states, tetrabenzoporphyrin, phthalocyanines.

Novel 2,1,3-Benzothiadiazole-Based Red-Fluorescent Dyes with Enhanced Two-Photon Absorption Cross-Sections

2006 ◽  
Vol 12 (8) ◽  
pp. 2303-2317 ◽  
Author(s):  
Shin-ichiro Kato ◽  
Taisuke Matsumoto ◽  
Motoyuki Shigeiwa ◽  
Hideki Gorohmaru ◽  
Shuuichi Maeda ◽  
...  
Keyword(s):  
Cross Sections ◽  
Fluorescent Dyes ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Two Photon
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