New cyano-substituted organic dyes containing different electrophilic groups: aggregation-induced emission and large two-photon absorption cross section

Tetrahedron ◽  
2014 ◽  
Vol 70 (39) ◽  
pp. 7050-7056 ◽  
Author(s):  
Haitao Zhou ◽  
Wei Huang ◽  
Li Ding ◽  
Shengyun Cai ◽  
Xin Li ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Organic Dyes ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Aggregation Induced Emission ◽  
Two Photon Absorption ◽  
Two Photon

Small molecules based on diphenylamine and carbazole with large two-photon absorption cross sections and extraordinary AIEE properties

RSC Advances ◽  
2014 ◽  
Vol 4 (73) ◽  
pp. 38939-38942 ◽  
Author(s):  
Guojian Tian ◽  
Wei Huang ◽  
Shengyun Cai ◽  
Haitao Zhou ◽  
Bo Li ◽  
...  
Keyword(s):  
Small Molecules ◽  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Aggregation Induced Emission ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Emission Enhancement

Two simple small molecules based on diphenylamine (T1) and carbazole (T2) have been synthesized and characterized. Both dyes exhibit extraordinary aggregation-induced emission enhancement properties and high corresponding quantum efficiencies of 11.5% and 16.0%. The value of the two-photon absorption cross-section for T1 is 1240 GM.

Utilizing formation of dye aggregates with aggregation-induced emission characteristics for enhancement of two-photon absorption

2018 ◽  
Vol 6 (16) ◽  
pp. 4384-4388 ◽  
Author(s):  
Adrian Justyniarski ◽  
Jan K. Zaręba ◽  
Piotr Hańczyc ◽  
Piotr Fita ◽  
Marta Chołuj ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Direct Evidence ◽  
Photon Absorption ◽  
Emission Characteristics ◽  
Absorption Cross ◽  
Aggregation Induced Emission ◽  
Two Photon Absorption ◽  
Two Photon

Femtosecond Z-scan measurements of aggregates of a quadrupolar D-π-D dye, provide direct evidence that aggregation of this AIE chromophore leads to a sizeable enhancement of the intrinsic two-photon absorption cross section.

Syntheses and properties of acetylene-linked bis- and trisporphyrins toward two-photon photodynamic therapy

2007 ◽  
Vol 11 (06) ◽  
pp. 406-417 ◽  
Author(s):  
Yusuke Inaba ◽  
Kazuya Ogawa ◽  
Yoshiaki Kobuke
Keyword(s):  
Photodynamic Therapy ◽  
Cross Section ◽  
Sodium Salt ◽  
Absorption Cross Section ◽  
Water Soluble ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Photon Irradiation ◽  
Two Photon

Acetylene-bridged bisporphyrins and trisporphyrins having branched bulky bis(carboxylethyl)methyl meso-substituents were synthesized. These compounds showed large effective two-photon absorption cross-section values at 890 nm measured by using a nanosecond Z-scan method. Sodium salt of hydrolyzed trisporphyrins showed broad and red-shifted Q-bands over 900 nm. Two-photon absorption cross-section values of water-soluble dimers in water were similar to, or slightly larger than, those of ester forms evaluated in toluene. Furthermore, the generation of singlet oxygen upon one-photon irradiation for dimers in water was confirmed.

scholarly journals Ultrafast processes triggered by one- and two-photon excitation of a photochromic and luminescent hydrazone

2019 ◽  
Vol 15 ◽  
pp. 2438-2446 ◽  
Author(s):  
Alessandro Iagatti ◽  
Baihao Shao ◽  
Alberto Credi ◽  
Barbara Ventura ◽  
Ivan Aprahamian ◽  
...  
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Transient Absorption ◽  
Solvent Polarity ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Time Resolved ◽  
Two Photon Absorption ◽  
Two Photon

In this work we apply a combination of steady state and time resolved luminescence and absorption spectroscopies to investigate the excited-state dynamics of a recently developed molecular photoswitch, belonging to the hydrazone family. The outstanding properties of this molecule, involving fluorescence toggling, bistability, high isomerization quantum yield and non-negligible two-photon absorption cross section, make it very promising for numerous applications. Here we show that the light induced Z/E isomerization occurs on a fast <1 ps timescale in both toluene and acetonitrile, while the excited state lifetime of the Z-form depends on solvent polarity, suggesting a partial charge transfer nature of its low lying excited state. Time-resolved luminescence measurements evidence the presence of a main emission component in the 500–520 nm spectral range, attributed to the Z-isomer, and a very short living blue-shifted emission, attributed to the E-isomer. Finally, transient absorption measurements performed upon far-red excitation are employed as an alternative method to determine the two-photon absorption cross-section of the molecule.

Sign in / Sign up

Export Citation Format

Share Document