Determination of the photoluminescence quantum yield of dilute dye solutions (IUPAC Technical Report)

Resch‐Genger, Ute; Rurack, Knut

doi:10.1351/pac-rep-12-03-03

Cited by 122 publications

(98 citation statements)

References 83 publications

(253 reference statements)

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“…By calculating the ratio between the absorbed area in the excitation light profile and the integrated emission intensity at around 1270 nm in Figure 4, the absolute emission quantum yield (Φ p 1 Δ ) of O 2 (a 1 Δ g ) in air- In CCl 4 and CS 2 , lifetimes of the a 1 Δ g → X 3 Σ g − emission were much longer than those in other solvents used in this study (vide infra). The O 2 (a 1 Δ g ) emission in CCl 4 and CS 2 appears to be quenched by collisions with the sensitizer molecule and ground-state O 2 ( 3 Σ g − ). We examined the quenching rate constants (k q ) by PtTFPP in air-saturated CCl 4 and CS 2 using eq 3, which was derived from eq 2 by assuming that Φ 1 Δ = 1 (vide infra).…”

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confidence: 97%

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Absolute Phosphorescence Quantum Yields of Singlet Molecular Oxygen in Solution Determined Using an Integrating Sphere Instrument

et al. 2015

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In this paper, we present an integrating sphere instrument for absolute luminescence quantum yield measurements from the visible to near-infrared (NIR) spectral region (λ = 350-1650 nm). The integrating sphere is equipped with a Xe light source and two spectrally corrected multichannel analyzers using a back-thinned charge-coupled device (CCD) and InGaAs detector, one for measurements in the visible to NIR wavelength region (λ = 350-1100 nm) and the other for the NIR wavelength region (λ = 900-1650 nm). The combination of the two optical multichannel analyzers allows measurement of the absolute quantum yield of NIR emissions with good sensitivity. Using this new instrument and platinum(II) meso-tetra(pentafluorophenyl)porphine (PtTFPP) as a sensitizer, we performed the first absolute measurements of quantum yield (Φ(p)(¹Δ)) of the a¹Δ(g) (v′ = 0) → X³Σ(g)⁻ (v″ = 0) emission at 1270 nm from molecular oxygen in different solvents. The quantum yields Φ(p)(¹Δ) in CCl₄ and CS₂ under infinite dilution of sensitizer were determined to be 2.2 × 10⁻² and 6.4 × 10⁻², respectively. Using the Φ(p)(¹Δ) value in CCl₄, the quantum yields in other solvents were determined based on the relative method. From the phosphorescence quantum yields and the lifetimes of O₂(a¹Δ(g)) taken under identical experimental conditions, we evaluated the radiative and nonradiative rate constants of O₂(a¹Δ(g)), which are key parameters to understand the photophysical properties of singlet oxygen in solution. The quantum yields and radiative and nonradiative rate constants obtained in the present study were compared with the literature values determined based on the relative method.

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confidence: 97%

“…where the contribution of the quenching processes by the sensitizer molecule and ground-state oxygen, which are denoted as k q [S] and k q ′[O 2 ] in eq 6, was neglected for all solvents except for CCl4 and CS 2 , because k q [S] and k q ′[O 2 ] are much smaller than (τ p 1 Δ ) −1 . In CCl 4 and CS 2 , the k q [S] values were calculated as 1.2 ×…”

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confidence: 99%

Absolute Phosphorescence Quantum Yields of Singlet Molecular Oxygen in Solution Determined Using an Integrating Sphere Instrument

et al. 2015

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“…The first three issues are instrumentation-related. Many aspects of these have been detailed in various IUPAC technical reports [12][13][14]. The fourth and fifth factors relating to the samples are critical here, because many of the samples being tested by EEM/SFS/ARMES are biogenic in origin.…”

Section: Mdf Measurement Techniquesmentioning

confidence: 99%

Calibration, standardization, and quantitative analysis of multidimensional fluorescence (MDF) measurements on complex mixtures (IUPAC Technical Report)

Ryder

Stedmon

Harrit

et al. 2017

Pure and Applied Chemistry

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This IUPAC Technical Report describes and compares the currently applied methods for the calibration and standardization of multi-dimensional fluorescence (MDF) spectroscopy data as well as recommendations on the correct use of chemometric methods for MDF data analysis. The paper starts with a brief description of the measurement principles for the most important MDF techniques and a short introduction to the most important applications. Recommendations are provided for instrument calibration, sample preparation and handling, and data collection, as well as the proper use of chemometric data analysis methods.

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“…The absorption and fluorescence measurements were typically performed with 10-mm quartz cuvettes (Shimadzu) using air-saturated solutions at room temperature. The fluorescence QY of the QDs was estimated using the comparative method of Williams et al [34] considering some current recommendations [38,39]. Powder X-ray diffraction (XRD) patterns were recorded on a Shimadzu XRD-6000 apparatus using CuKα radiation.…”

Section: Characterizationmentioning

confidence: 99%

Water-Soluble CdTe/CdS Core/Shell Semiconductor Nanocrystals: How Their Optical Properties Depend on the Synthesis Methods

et al. 2016

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Abstract:We conducted a comparative synthesis of water-soluble CdTe/CdS colloidal nanocrystalline semiconductors of the core/shell type. We prepared the CdS shell using two different methods: a one-pot approach and successive ionic layer adsorption and reaction (SILAR); in both cases, we used 3-mercaptopropionic acid (MPA) as the surface ligand. In the one-pot approach, thiourea was added over the freshly formed CdTe dispersion, and served as the sulfur source. We achieved thicker CdS layers by altering the Cd:S stoichiometric ratio (1:1, 1:2, 1:4, and 1:8). The Cd:S ratios 1:1 and 1:2 furnished the best optical properties; these ratios also made the formation of surface defects less likely. For CdTe/CdS obtained using SILAR, we coated the surface of three differently sized CdTe cores (2.17, 3.10, and 3.45 nm) with one to five CdS layers using successive injections of the Cd 2+ and S 2-ions. The results showed that the core size influenced the optical properties of the materials. The deposition of three to five layers over the surface of smaller CdTe colloidal nanocrystals generated strain effects on the core/shell structure.

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Determination of the photoluminescence quantum yield of dilute dye solutions (IUPAC Technical Report)

Cited by 122 publications

References 83 publications

Absolute Phosphorescence Quantum Yields of Singlet Molecular Oxygen in Solution Determined Using an Integrating Sphere Instrument

Absolute Phosphorescence Quantum Yields of Singlet Molecular Oxygen in Solution Determined Using an Integrating Sphere Instrument

Calibration, standardization, and quantitative analysis of multidimensional fluorescence (MDF) measurements on complex mixtures (IUPAC Technical Report)

Water-Soluble CdTe/CdS Core/Shell Semiconductor Nanocrystals: How Their Optical Properties Depend on the Synthesis Methods

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