INFLUENCES OF AGGREGATION ON THE TWO-PHOTON FLUORESCENCE PROCESS

2013 ◽  
Vol 22 (01) ◽  
pp. 1350011 ◽  
Author(s):  
ZHIQIANG ZHOU ◽  
CHANGGUI LU ◽  
YIPING CUI
Keyword(s):  
Measurement Error ◽  
Cross Section ◽  
Correction Method ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Large Measurement ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence ◽  
Large Measurement Error

Rhodamine B (RhB) is most often used as the reference in the two-photon induced fluorescence (TPIF) method to measure the two-photon absorption (TPA) cross-section. In this work, we investigate the influences of dimer formation, energy transfer and self-absorption on the two-photon fluorescence process. Those three effects will result in a large measurement error of the TPA cross-section. We thus provide a concentration gradient correction method by considering the above three processes to eliminate the measurement error.

Nonlinear optical property and ultrafast response of a two-photon photopolymerization initiator based on dibenzothiophene

2017 ◽  
Vol 26 (04) ◽  
pp. 1750048 ◽  
Author(s):  
Yaochuan Wang ◽  
Dajun Liu ◽  
Yizhuo Wang ◽  
Guiqiu Wang ◽  
Xiaoqiang Yu
Keyword(s):  
Cross Section ◽  
Fluorescence Emission ◽  
Photon Absorption ◽  
Time Resolved ◽  
Pump Probe ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Uv Visible ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence

A dibenzothiophene-based two-photon photopolymerization (TPP) initiator named E,E-1,4-bis[3-vinyl-dibenzothiophene]-2,5-dimethoxybenzene (VBPMOB) with intense two-photon fluorescence (TPF) was investigated by UV–visible, fluorescence, pump–probe and time-resolved fluorescence spectroscopies. The maximum two-photon absorption (TPA) cross-section of VBPMOB in DMF was determined to be 274[Formula: see text]GM. In addition, the TPA cross-section at 800[Formula: see text]nm was 230[Formula: see text]GM, which is the most commonly used wavelength for TPP. The ultrafast spectra result indicated that after excitation, the VBPMOB molecule will first undergo a fast internal conversion process to form an intramolecular charge transfer (ICT) state with a certain width followed by relaxation of the ICT state with fluorescence emission.

Determination of Two-Photon Absorption Cross-Sections in Selected Diketo-Pyrrolo-Pyrroles

2019 ◽  
Vol 955 ◽  
pp. 37-43
Author(s):  
Martin Vala ◽  
Matouš Kratochvíl ◽  
Patricie Heinrichova ◽  
Martin Weiter
Keyword(s):  
Cross Sections ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Strong Fluorescence ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Donor Acceptor ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence

The paper deals with determination of two-photon absorption cross-sections of selected representatives of diketo-pyrrolo-pyrrole. The materials were optimized in order to test the influence of various substitutions on the diketo-pyrrolo-pyrrole basic molecule. The two-photon absorption cross-sections were determined using two-photon excited fluorescence technique. A considerably high two-photon absorption cross-section in order of 1000 GM was found for non-symmetrically substituted derivative with donor-acceptor structure. All of the derivatives showed strong fluorescence in solid state visible by naked eye. These results demonstrate that this class of materials can be used in e.g. two-photon fluorescence microscopy in the form of nanoparticles.

PEGYLATED CONJUGATED OLIGOMERS FOR TARGETED TWO-PHOTON FLUORESCENCE IMAGING OF CANCER CELLS

2013 ◽  
Vol 01 (03) ◽  
pp. 1340011
Author(s):  
GUAN WANG ◽  
JUNLONG GENG ◽  
XINHAI ZHANG ◽  
GUICHUAN XING ◽  
TZE CHIEN SUM ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Imaging ◽  
Cross Section ◽  
Fluorescence Quantum Yield ◽  
Photon Absorption ◽  
Fluorescence Measurement ◽  
Experimental Conditions ◽  
Two Photon ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence

A water-dispersible PEGylated conjugated oligomer (PEGTVFVBN) is synthesized for two-photon fluorescence imaging applications. PEGTVFVBN could aggregate into nanoparticles of ~ 110 nm size in H 2 O , which show a fluorescence quantum yield of 0.12, 20 times higher than that for its cationic counterpart (TVFVBC). Two-photon fluorescence measurement reveals a maximum two-photon absorption (TPA) cross-section of 263 GM at 780 nm based on molecules for PEGTVFVBN nanoparticles in H 2 O , while the TPA spectra of TVFVBC are barely detectable under the same experimental conditions. The N , N' -diacetylchitobiotic acid conjugated derivative (ChPEGTVFVBN) could also aggregate into nanoparticles of ~ 90 nm sizes, showing a slightly smaller fluorescence quantum yield of 0.08 and a maximum TPA cross-section of 213 GM at 780 nm. ChPEGTVFVBN could be specifically internalized by vimentin over expressing Hela cells through a receptor mediated endocytosis, giving two-photon fluorescence images in a bright and high contrast manner. In addition, both PEGTVFVBN and ChPEGTVFVBN show low cytotoxicity, which is essential for cell imaging applications. This study thus highlights the molecular engineering strategy of PEGylation to construct robust TPA materials for two-photon fluorescence imaging applications.

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