scholarly journals Two-photon excited fluorescence of BF2complexes of curcumin analogues: toward NIR-to-NIR fluorescent organic nanoparticles

2014 ◽  
Vol 2 (26) ◽  
pp. 5208-5215 ◽  
Author(s):  
Anthony D'Aléo ◽  
Abdellah Felouat ◽  
Vasile Heresanu ◽  
Alain Ranguis ◽  
Damien Chaudanson ◽  
...  
Keyword(s):  
Cross Section ◽  
Near Infrared ◽  
Infrared Region ◽  
Organic Nanoparticles ◽  
Two Photon ◽  
Curcumin Analogues ◽  
Fluorescent Organic Nanoparticles ◽  
Photon Excitation ◽  
Near Infrared Region ◽  
Two Photon Excitation

Two-photon excitation of curcuminoid borondifluoride nanoparticles in water results in rather efficient luminescence in the near infrared region due to a high two-photon cross-section.

A series of terpyridine-based zinc(ii) complexes assembled for third-order nonlinear optical responses in the near-infrared region and recognizing lipid membranes

2017 ◽  
Vol 5 (31) ◽  
pp. 6348-6355 ◽  
Author(s):  
Yiwen Tang ◽  
Ming Kong ◽  
Xiaohe Tian ◽  
Jinghang Wang ◽  
Qingyuan Xie ◽  
...  
Keyword(s):  
Lipid Membranes ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Infrared Region ◽  
Biological Imaging ◽  
Tissue Penetration ◽  
Third Order ◽  
Two Photon ◽  
Optical Responses ◽  
Near Infrared Region

Two-photon (TP) microscopy has advantages for biological imaging in that it allows deeper tissue-penetration and excellent resolution compared with one-photon (OP) microscopy.

scholarly journals Two-Photon–NIR-II Antimicrobial Graphene-Nanoagent for Ultraviolet–NIR Imaging and Photoinactivation

2021 ◽  
Author(s):  
WEN-SHUO KUO ◽  
Chia-Yuan Chang ◽  
Ping-Ching Wu ◽  
Jiu-Yao Wang
Keyword(s):  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Chemical Modification ◽  
Near Infrared ◽  
Photon Absorption ◽  
Excitation Wavelength ◽  
Strong Electron ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Abstract BackgroundNitrogen doping and amino-group functionalization, which result in strong electron donation, can be achieved through chemical modification. Large π-conjugated systems of graphene quantum dot (GQD)-based materials acting as electron donors can be chemically manipulated with low two-photon excitation energy in a short photoexcitation time for improving the charge transfer efficiency of sorted nitrogen-doped amino acid–functionalized GQDs (sorted amino-N-GQDs). ResultsIn this study, a self-developed femtosecond Ti-sapphire laser optical system (222.7 nJ pixel−1 with 100-170 scans, approximately 0.65-1.11 s of total effective exposure times; excitation wavelength: 960 nm in the near-infrared II region) was used for chemical modification. The sorted amino-N-GQDs exhibited enhanced two-photon absorption, post-two-photon excitation stability, two-photon excitation cross-section, and two-photon luminescence through the radiative pathway. The lifetime and quantum yield of the sorted amino-N-GQDs decreased and increased, respectively. Furthermore, the sorted amino-N-GQDs exhibited excitation-wavelength-independent photoluminescence in the near-infrared region and generated reactive oxygen species after two-photon excitation. An increase in the size of the sorted amino-N-GQDs boosted photochemical and electrochemical efficacy and resulted in high photoluminescence quantum yield and highly efficient two-photon photodynamic therapy. ConclusionThe sorted dots can be used in two-photon contrast probes for tracking and localizing analytes during two-photon imaging in a biological environment and for conducting two-photon photodynamic therapy for eliminating infectious microbes.

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