Single-Photon Infrared Photochemistry: Wavelength and Temperature Dependence of the Quantum Yield for the Laser-Induced Ionization of Water

1979 ◽  
pp. 283-285
Author(s):  
David M. Goodall ◽  
Rodney C. Greenhow ◽  
Barry Knight ◽  
Joseph F. Holzwarth ◽  
Wolfgang Frisch
Keyword(s):  
Quantum Yield ◽  
Temperature Dependence ◽  
Single Photon ◽  
Ionization Of Water

scholarly journals Thermochromism of Highly Luminescent Photopolymer Flexible Films Based On Eu (III) Salts Confined in Polysulfone

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5394
Author(s):  
Mani Outis ◽  
João Paulo Leal ◽  
Maria Helena Casimiro ◽  
Bernardo Monteiro ◽  
Cláudia Cristina Lage Pereira
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Melting Point ◽  
Quantum Yield ◽  
Thermal Behavior ◽  
Temperature Dependence ◽  
Strong Temperature Dependence ◽  
Host Matrix ◽  
Flexible Films ◽  
First Time

Here we discuss the influence of two different cations on the emissive properties of the highly emissive [Eu(fod)4]− anion. The studied Eu(III) salts were [C16Pyr][Eu(fod)4] (1), and the previously reported [Chol][Eu(fod)4]. C16Pyr stands for N-cetylpyridinium, Chol for cholinium and fod for 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dionate. 1 is classified as ionic liquid, with melting point close to 60 °C, and presented a luminescence quantum yield of (ϕ) 100%. Ultrabright emissive photopolymers were obtained for the first time using polysulfone as the host matrix. The films were prepared with incorporation of 10% (w/w) of 1 and [Chol][Eu(fod)4] in the polymeric matrix, which improved its thermal stability. Additionally, the luminescence of CholEu(fod)4/PSU presented a strong temperature dependence with a ratiometric thermal behavior.

Die Abklingdauer der Fluoreszenz von Naphthalin-Kristallen

1967 ◽  
Vol 22 (8) ◽  
pp. 1242-1246 ◽  
Author(s):  
T. B. El-Kareh ◽  
H. C. Wolf
Keyword(s):  
Simple Model ◽  
Quantum Yield ◽  
Temperature Dependence ◽  
Electronic State ◽  
Oscillator Strength ◽  
Short Duration ◽  
Decay Time ◽  
Fluorescence Decay ◽  
Sample Thickness ◽  
Fluorescence Decay Time

The fluorescence decay time of naphthalene crystals has been measured as a function of sample thickness (1 μ-1 cm) and temperature (4.2°K-300°K) when excited in the first electronic state with UV pulses of short duration. A simple model is proposed to explain the decay mechanism, assuming constant quantum yield and oscillator strength and taking into account both Davydov-levels A and B. The reabsorption is found to be directly proportional to the temperature. The decay time of the lower Davydov-component can be measured directly as τA = (115 ± 5) nsec. The decay time of the higher level B is calculated from the dependence on the thickness as τB = (20 ± 10) nsec, and from the temperature dependence as TB= (30 ± 10) nsec.

Cl2O photochemistry: Ultraviolet/vis absorption spectrum temperature dependence and O(3P) quantum yield at 193 and 248 nm

2011 ◽  
Vol 134 (20) ◽  
pp. 204310 ◽  
Author(s):  
Dimitrios K. Papanastasiou ◽  
Karl J. Feierabend ◽  
James B. Burkholder
Keyword(s):  
Absorption Spectrum ◽  
Quantum Yield ◽  
Temperature Dependence

Absolute Quantum Yields for Exciplex Fluorescence

1990 ◽  
Vol 44 (1) ◽  
pp. 101-105 ◽  
Author(s):  
S. J. Hale ◽  
L. A. Melton
Keyword(s):  
Quantum Yield ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Quantum Yields ◽  
Absolute Quantum Yield ◽  
The Absolute ◽  
Visualization Systems ◽  
Methyl Naphthalene ◽  
Absolute Quantum ◽  
Exciplex Fluorescence

The absolute quantum yields for exciplex fluorescence in four solutions which have potential as exciplex-based vapor/liquid visualization systems have been measured. The room-temperature absolute quantum yields for 10% dibutyl-aniline/0.4%, 1-cyanonaphthalene, 12.5% 1-methyl-naphthalene/0.5% N,N,N′,N′-tetramethyl- p-phenylenediamine (TMPD), 10% trihexylamine/1.0% 1-cyanonaphthalene, and 10% naphthalene/1.0% TMPD in hexadecane or cyclohexane are 0.03 ± 0.005, 0.05 ± 0.002 (308 nm), 0.02 ± 0.001, and 0.16 ± 0.021, respectively. The temperature dependence of the absolute quantum yield for the 10% naphthalene/1% TMPD in the hexadecane system was measured over the range of 23 to 260°C and was found to decrease by 20–30% at 260°C.

Sign in / Sign up

Export Citation Format

Share Document