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.

Accurate Determination of the Absolute Quantum Yield for O(1D) Formation in the Photolysis of Ozone at 308 nm.

ChemInform ◽  
2005 ◽  
Vol 36 (11) ◽  
Author(s):  
Kenshi Takahashi ◽  
Shinsuke Hayashi ◽  
Takayuki Suzuki ◽  
Yutaka Matsumi
Keyword(s):  
Quantum Yield ◽  
Accurate Determination ◽  
Absolute Quantum Yield ◽  
The Absolute ◽  
Absolute Quantum

Messung absoluter Quantenausbeuten von Quantenwandlern / Absolute Quantum Yield Measurement for Quantum Counters

1974 ◽  
Vol 29 (2) ◽  
pp. 224-229 ◽  
Author(s):  
H. G. Küttner ◽  
H. L. Selzle ◽  
E. W. Schlag
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Hydrogen Bonds ◽  
Crystalline Phase ◽  
Visible Spectrum ◽  
Absolute Measurement ◽  
Photon Flux ◽  
Absolute Quantum Yield ◽  
The Absolute ◽  
Absolute Quantum

The absolute quantum yield of different fluorescing dyes has been measured in the solid micro crystalline phase, with a view towards finding dyes which exhibit a constant quantum yield in the visible spectrum. Some suitable dyes have been found and these can now be used as quantum counters for the absolute measurement of photon flux, such as in photochemical experiments. The specific characteristic of the dye responsible for this effect appears to be connected with the action of hydrogen bonds as energy transfer agents.

A large-scale synthesis of photoluminescent carbon quantum dots: a self-exothermic reaction driving the formation of the nanocrystalline core at room temperature

2016 ◽  
Vol 18 (19) ◽  
pp. 5127-5132 ◽  
Author(s):  
Bin Bin Chen ◽  
Ze Xi Liu ◽  
Wen Chan Deng ◽  
Lei Zhan ◽  
Meng Li Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Large Scale ◽  
Room Temperature ◽  
Exothermic Reaction ◽  
Carbon Quantum Dots ◽  
Core Shell ◽  
Absolute Quantum Yield ◽  
Structural Carbon ◽  
Absolute Quantum

Core–shell structural carbon quantum dots (CQDs) are prepared through a highly efficient self-exothermic reaction at room temperature, which possess 24.6% absolute quantum yield and can be well applied for analysis applications.

Accurate Determination of the Absolute Quantum Yield for O(1D) Formation in the Photolysis of Ozone at 308 nm

2004 ◽  
Vol 108 (47) ◽  
pp. 10497-10501 ◽  
Author(s):  
Kenshi Takahashi ◽  
Shinsuke Hayashi ◽  
Takayuki Suzuki ◽  
Yutaka Matsumi
Keyword(s):  
Quantum Yield ◽  
Accurate Determination ◽  
Absolute Quantum Yield ◽  
The Absolute ◽  
Absolute Quantum

Photooxidation effect of cupric complexes on aliphatic alcohols in nonaqueous solutions

1982 ◽  
Vol 47 (8) ◽  
pp. 2061-2068 ◽  
Author(s):  
Jan Sýkora ◽  
Mária Jakubcová ◽  
Zuzana Cvengrošová
Keyword(s):  
Coordination Sphere ◽  
Alcohol Oxidation ◽  
Aliphatic Alcohols ◽  
Oxidation Products ◽  
Molar Ratio ◽  
Quantum Yields ◽  
Nonaqueous Solutions ◽  
The Absolute ◽  
Absolute Quantum

In the photolysis of copper(II)-chloride-alcohol-acetonitrile systems (cCu = 1 mmol l-1, copper(II)-to-chloride molar ratio 1 : 2 to 1 : 8, 10% (v/v) alcohol), Cu(II) is reduced to Cu(I), and methanol, ethanol, 1-propanol, or 1-butanol is oxidized to the corresponding aldehyde, 2-propanol to acetone. In the case of 1-propanol and 1-butanol, chlorinated aldehydes are formed in addition too. The measured quantum yields of the photoreduction of Cu(II) to Cu(I) lay in the range of ΦCu(I) = 4.5 to 40 mmol einstein-1, the absolute quantum yields of the alcohol oxidation products were 2.3 to 47 mmol einstein-1. The photoactive components are chlorocupric complexes [CuClx](2-x)+ (x = 1-4). The presence of complexes with a higher number of chloroligands in the coordination sphere (x = 3, 4) brings about a decrease in the Cu(II) photoreduction rate. The decrease in the photoreduction rate observed in the presence of dioxygen is explained in terms of re-oxidation of copper(I) by the latter, resulting in an increase in the concentration of the photochemically active cupric complexes. The catalytic aspects of the systems in question are discussed with respect to this effect.

Manifestation of Сoncentration Quenching of Fluoroaluminate Glasses Doped with Erbium

2019 ◽  
Vol 822 ◽  
pp. 871-877
Author(s):  
Victor Klinkov ◽  
Aleksander Semencha ◽  
Evgenia Tsimerman ◽  
Artem Osipov ◽  
Margarita G. Dronova
Keyword(s):  
Quantum Yield ◽  
Decay Curve ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Ion Energy ◽  
Maximum Value ◽  
Absolute Quantum Yield ◽  
Concentration Dependences ◽  
Yield Values ◽  
Absolute Quantum

Fluoroaluminate glasses of the composition 2Ва (РО3)2–98MgCaSrBaYAl2F14-xErF3, where x=0, 0.1, 0.5, 1.0 mol. % have been prepared by melt quenching technique and characterized by optical absorption, emission spectra and decay curve analysis. Measured transmission spectra indicate the high practical relevance of the composition of glasses under investigation for photonics and optoelectronics products. In the region of 500–700 nm, luminescence spectra with peaks at about 522, 550, and 665 nm were obtained. The positions of the luminescence bands have been described using an erbium ion energy scheme. The concentration dependences of the absolute quantum yield values for the series of Er3+-doped fluoroaluminate glasses were also established. The maximum value of absolute quantum yield was found for a sample with Er3+ concentration 0.21∙1020 сm-3. The main reason for reducing the values of absolute quantum yield is concentration quenching.

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