Measurement of the quantum yield of triplet formation and short triplet lifetimes by the transient grating technique

1991 ◽  
Vol 95 (9) ◽  
pp. 6490-6495 ◽  
Author(s):  
Masahide Terazima ◽  
Noboru Hirota
Keyword(s):  
Quantum Yield ◽  
Transient Grating ◽  
Triplet Formation

scholarly journals Theoretical and Experimental Investigation on the Intersystem Crossing Kinetics in Benzothioxanthene Imide Luminophores, and Their Dependence on Substituents Effects

2020 ◽  
Author(s):  
Laura Abad Galan ◽  
Jose Maria Andrés Castán ◽  
Clement Dalinot ◽  
Pablo Simon Marques ◽  
Philippe Blanchard ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Luminescence Properties ◽  
Intersystem Crossing ◽  
Structural Modifications ◽  
Perylene Bisimide ◽  
Rational Engineering ◽  
Triplet Formation

<p><i>In spite of their remarkable luminescence properties, benzothioxanthene imide (BTXI an imide containing rylene chromophores) derivatives have been largely overlooked compared to their perylene bisimide and naphthalene bisimide counterparts. Thus their detailed photophysics are much less understood. In this paper, we show how relatively simple structural modifications of the backbone of BTXIs can lead to impressive variations in their Inter-System Crossing kinetics. Thus, through rational engineering of their structure, it is possible to obtain a triplet formation quantum yield that reaches unity, making BTXI a promising class of compounds for triplet-based applications (photodynamic therapy, electroluminescence, etc.).</i></p>

scholarly journals Theoretical and Experimental Investigation on the Intersystem Crossing Kinetics in Benzothioxanthene Imide Luminophores, and Their Dependence on Substituents Effects

2020 ◽  
Author(s):  
Laura Abad Galan ◽  
Jose Maria Andrés Castán ◽  
Clement Dalinot ◽  
Pablo Simon Marques ◽  
Philippe Blanchard ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Luminescence Properties ◽  
Intersystem Crossing ◽  
Structural Modifications ◽  
Perylene Bisimide ◽  
Rational Engineering ◽  
Triplet Formation

<p><i>In spite of their remarkable luminescence properties, benzothioxanthene imide (BTXI an imide containing rylene chromophores) derivatives have been largely overlooked compared to their perylene bisimide and naphthalene bisimide counterparts. Thus their detailed photophysics are much less understood. In this paper, we show how relatively simple structural modifications of the backbone of BTXIs can lead to impressive variations in their Inter-System Crossing kinetics. Thus, through rational engineering of their structure, it is possible to obtain a triplet formation quantum yield that reaches unity, making BTXI a promising class of compounds for triplet-based applications (photodynamic therapy, electroluminescence, etc.).</i></p>

Quantum yield of triplet formation for indocyanine green

1997 ◽  
Vol 105 (1) ◽  
pp. 65-68 ◽  
Author(s):  
S. Reindl ◽  
A. Penzkofer ◽  
S.-H. Gong ◽  
M. Landthaler ◽  
R.M. Szeimies ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Indocyanine Green ◽  
Triplet Formation

Substituted Phosphorous Triazatetrabenzocorroles: Correlation Between Structure and Excited State Properties

2009 ◽  
Vol 62 (5) ◽  
pp. 434 ◽  
Author(s):  
Xian-Fu Zhang ◽  
Yakuan Chang ◽  
Yanling Peng ◽  
Fushi Zhang
Keyword(s):  
Quantum Yield ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Laser Flash ◽  
Time Resolved Fluorescence ◽  
Absorption Properties ◽  
Strong Electron ◽  
Time Resolved ◽  
Triplet Formation

The photophysical properties of five novel phthalocyanine analogues, dihydroxy phosphorus(v) triazatetrabenzocorrole (PTBC) substituted with –NO2, –SO3H, OiPr, and –NH2, respectively, were studied by a combination of absorption, steady-state emission, time-resolved fluorescence, and laser flash photolysis. All substituents, even for the strong electron-donating –NH2, cause only a slight red shift of their absorption and emission maxima. These complexes are generally monomeric in organic solution, whereas the sulfonated derivative, PTBC(SO3H)4, slightly aggregates in aqueous buffer. Distinct from phthalocyanines, PTBCs substituted with –NO2 or –NH2 still show high photo activities. The electron-withdrawing –NO2 and –SO3H decrease the fluorescence quantum yield but increase the triplet formation yield to 0.76 and 0.82, respectively. All PTBCs have long triplet lifetimes and hence generate singlet oxygen efficiently with a quantum yield from 0.43 to 0.75. Together with the ground-state absorption properties, the results suggest that these PTBCs may be used as excellent photosensitizers for photodynamic therapy.

Phthalocyanine photophysics and photosensitizer efficiency on human embryonic lung fibroblasts

2001 ◽  
Vol 05 (05) ◽  
pp. 460-464 ◽  
Author(s):  
JOHN W. OWENS ◽  
MARSHA ROBINS
Keyword(s):  
Quantum Yield ◽  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Zinc Phthalocyanine ◽  
Lung Fibroblasts ◽  
Quantum Yields ◽  
Cancer Drug ◽  
Embryonic Lung ◽  
Human Embryonic Lung ◽  
Triplet Formation

This study correlates the photophysical properties of aluminum phthalocyanine tetrasulfonate (AlPcTs), zinc phthalocyanine tetrasulfonate (ZnPcTs), and phthalocyanine tetrasulfonate (PcTs) with their ability to kill human embryonic lung (HEL) cells. Photofrin, a proven anti-cancer drug, was used for comparison. The photophysical properties include fluorescence emission spectra, fluorescence quantum yields, singlet state and radiative lifetimes, quantum yield for triplet formation, and fluorescence rate constants. Results indicate that photodynamic efficacy correlates inversely with fluorescence quantum yield and fluorescence lifetime and directly with quantum yield for triplet formation.

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