New two-photon absorption benzotriazole–coumarin dyads: the evidence of internal proton transfer in the excited state

2015 ◽  
Vol 56 (1) ◽  
pp. 236-242 ◽  
Author(s):  
Yulong Gong ◽  
Yao Lu ◽  
Zhenqiang Wang ◽  
Shengtao Zhang ◽  
Ziping Luo ◽  
...  
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Near infrared two-photon-excited and -emissive dyes based on a strapped excited-state intramolecular proton-transfer (ESIPT) scaffold

2018 ◽  
Vol 9 (10) ◽  
pp. 2666-2673 ◽  
Author(s):  
Naoya Suzuki ◽  
Kayo Suda ◽  
Daisuke Yokogawa ◽  
Hirotaka Kitoh-Nishioka ◽  
Stephan Irle ◽  
...  
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Near Infrared ◽  
Intramolecular Proton Transfer ◽  
Infrared Emission ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Near Infrared Emission

Strapped acceptor–π–donor–π–acceptor type fluorophores exhibit intense near infrared emission, together with near infrared two-photon absorption.

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.

Two-Photon Absorption and Excited State Dynamics of Two Organic Molecules Containing Donor/Acceptor Moieties

2008 ◽  
Vol 25 (7) ◽  
pp. 2456-2459 ◽  
Author(s):  
Yan Yong-Li ◽  
Li Bo ◽  
Liu Kang-Jun ◽  
Dong Zhi-Wei ◽  
Ma Guo-Hong ◽  
...  
Keyword(s):  
Excited State ◽  
Organic Molecules ◽  
Photon Absorption ◽  
Excited State Dynamics ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Donor Acceptor

scholarly journals Facile synthesis and exploration of excited state assisted two-photon absorption properties of D–A–D type thiophene–pyridine derivatives

2020 ◽  
Vol 19 (5) ◽  
pp. 726-736
Author(s):  
Viprabha Kakekochi ◽  
Sathish Chatnahalli Gangadharappa ◽  
Nikhil P. P. ◽  
Chandrasekharan Keloth ◽  
Ezequiel Wolcan ◽  
...  
Keyword(s):  
Excited State ◽  
Conjugated Polymer ◽  
Photon Absorption ◽  
Pyridine Derivatives ◽  
Facile Synthesis ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Donor Acceptor ◽  
Limiting Threshold

Diagrammatic representation of excited state assisted two-photon absorption (2PA) behavior of a donor–acceptor type conjugated polymer (P2TPy) exhibiting an extremely low optical limiting threshold.

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