Fluorescence quantum yields of dye aggregates: a showcase example based on self-assembled perylene bisimide dimers

2018 ◽  
Vol 20 (11) ◽  
pp. 7612-7620 ◽  
Author(s):  
Franziska Fennel ◽  
Jana Gershberg ◽  
Matthias Stolte ◽  
Frank Würthner
Keyword(s):  
Quantum Yield ◽  
Quantum Yields ◽  
Concentrated Solutions ◽  
Perylene Bisimide ◽  
Fluorescence Quantum Yields ◽  
Yield Determination ◽  
Self Assembled ◽  
Supramolecular Aggregates

Two measurement approaches for the precise quantum yield determination of supramolecular aggregates in highly concentrated solutions are presented and experimentally tested for an emissive perylene bisimide H-type aggregate with a quantum yield of 28%.

Absolute emission quantum yield determination of self-assembled mesoporous titania films grafted with a luminescent zinc complex

2009 ◽  
Vol 12 (3) ◽  
pp. 237-239 ◽  
Author(s):  
Daniela Aiello ◽  
Flaviano Testa ◽  
Rosario Aiello ◽  
Luca Malfatti ◽  
Tongjit Kidchob ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Zinc Complex ◽  
Mesoporous Titania ◽  
Yield Determination ◽  
Titania Films ◽  
Self Assembled ◽  
Emission Quantum Yield

Terminology, relative photonic efficiencies and quantum yields in heterogeneous photocatalysis. Part II: Experimental determination of quantum yields

1999 ◽  
Vol 71 (2) ◽  
pp. 321-335 ◽  
Author(s):  
Angela Salinaro ◽  
Alexei V. Emeline ◽  
Jincai Zhao ◽  
Hisao Hidaka ◽  
Vladimir K. Ryabchuk ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Visible Region ◽  
Heterogeneous Photocatalysis ◽  
Quantum Yields ◽  
Yield Data ◽  
Normal Absorption ◽  
The One ◽  
Solid Liquid ◽  
Photonic Efficiency

In the preceding article [Serpone and Salinaro, Pure Appl. Chem., 71(2), 303-320 (1999)] we examined two principal features of heterogeneous photocatalysis that demanded scrutiny: (i) description of photocatalysis and (ii) description of process efficiencies. For the latter we proposed a protocol relative photonic efficiency which could subsequently be converted to quantum yields. A difficulty in expressing a quantum yield in heterogeneous photochemistry is the very nature of the system, either solid/liquid or solid/gas, which places severe restrictions on measurement of the photon flow absorbed by the light harvesting component, herein the photocatalyst TiO2, owing to non-negligible scattering by the particulates. It was imperative therefore to examine the extent of this problem. Extinction and absorption spectra of TiO2 dispersions were determined at low titania loadings by normal absorption spectroscopy and by an integrated sphere method, respectively, to assess the extent of light scattering. The method is compared to the one reported by Grela et al. [J. Phys. Chem., 100, 16940 (1996)] who used a polynomial extrapolation of the light scattered in the visible region into the UV region where TiO2 absorbs significantly. This extrapolation underestimates the scattering component present in the extinction spectra, and will no doubt affect the accuracy of the quantum yield data. Further, we report additional details in assessing limiting photonic efficiencies and quantum yields in heterogeneous photocatalysis.

Fluorescence Quantum Yield Determination of Propylparaben Using Flow Injection Spectroscopy

2018 ◽  
Vol 28 (6) ◽  
pp. 1275-1280
Author(s):  
Kadhim Kh. Hashim ◽  
Shatha Y. Yahyaa ◽  
Asmaa A. Mohmmed Al-Rashidy
Keyword(s):  
Quantum Yield ◽  
Flow Injection ◽  
Fluorescence Quantum Yield ◽  
Yield Determination

Comparison of Fluorescence-to-Phosphorescence Quantum Yield Ratios in Solid-Matrix Luminescence as a Function of Temperature

1993 ◽  
Vol 47 (3) ◽  
pp. 283-286 ◽  
Author(s):  
R. J. Hurtubise ◽  
S. M. Ramasamy
Keyword(s):  
Quantum Yield ◽  
Singlet State ◽  
Yield Ratio ◽  
Solid Matrix ◽  
Quantum Yields ◽  
Phosphorescence Lifetime ◽  
Fundamental Parameters ◽  
Fluorescence Quantum Yields ◽  
Photophysical Parameters ◽  
Phosphorescence Quantum Yield

An equation that relates the ratio of fluorescence to phosphorescence quantum yields as function of temperature to basic photophysical parameters is considered. The quantum yields were obtained from three compounds on three different solid matrices. Fluorescence quantum yields did not change much with temperature, while phosphorescence quantum yields changed more substantially with temperature. For some of the systems considered, it was possible to show that, as the temperature was lowered, the quantum yield ratio was only a function of the phosphorescence lifetime of the phosphor. However, with other systems, the quantum yield ratio was dependent on both the rate constant of intersystem crossing from the singlet state to the triplet state and the phosphorescence lifetime. The equation discussed is important in defining the fundamental parameters that cause the luminescence quantum yield ratio to change as temperature is lowered.

Quantitative Determination of Photokinetic Parameters for Reversible Photoisomerizations in Light Scattering Adsorbent-Adsorbates

2000 ◽  
Vol 214 (2) ◽  
Author(s):  
R. Gade ◽  
Th. Porada
Keyword(s):  
Approximate Solution ◽  
Light Scattering ◽  
Quantum Yield ◽  
Present Method ◽  
Irradiation Time ◽  
Initial Slope ◽  
Quantum Yields ◽  
Absorption Coefficients ◽  
Actinic Light

Based on an approximate solution of the differential equations describing the rate of a reversible photoisomerization and the attenuation of the actinic light in a powdered adsorbent-adsorbate a method is presented permitting us to predict the irradiation time dependence of the sample reflectance and to determine both the quantum yields of the partial reactions and the absorption coefficients of the reactant and the product from the reflectance-time-curves measured at two different wavelengths. The present method, thus, is an improved version of the peviously reported procedure [1] which enables the quantum yield of a simple photoreaction to be calculated from the initial slope of the R(

Fluorescence quantum yield determination of molecules in liquids by thermally driven conical diffraction

2018 ◽  
Vol 197 ◽  
pp. 175-179 ◽  
Author(s):  
Sthanley R. De Lima ◽  
Gustavo J. Pereira ◽  
Djalmir N. Messias ◽  
Acácio A. Andrade ◽  
Elisabete Oliveira ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Yield Determination ◽  
Thermally Driven
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