scholarly journals Standards for photoluminescence quantum yield measurements in solution (IUPAC Technical Report)

2011 ◽  
Vol 83 (12) ◽  
pp. 2213-2228 ◽  
Author(s):  
Albert M. Brouwer
Keyword(s):  
Quantum Yield ◽  
Future Development ◽  
Recent Literature ◽  
Quantum Yields ◽  
Dilute Solutions ◽  
Large Group ◽  
Near Ir ◽  
Photoluminescence Quantum Yield ◽  
Technical Report ◽  
Spectral Ranges

The use of standards for the measurement of photoluminescence quantum yields (QYs) in dilute solutions is reviewed. Only three standards can be considered well established. Another group of six standards has been investigated by several independent researchers. A large group of standards is frequently used in recent literature, but the validity of these is less certain. The needs for future development comprise: (i) confirmation of the validity of the QY values of many commonly used standard materials, preferably in the form of SI traceable standards; (ii) extension of the set of standard materials to the UV and near-IR spectral ranges; and (iii) good standards or robust protocols for the measurements of low QYs.

Surface pre-optimization of a mixed halide perovskite toward high photoluminescence quantum yield in the blue spectrum range

Nanoscale ◽  
2019 ◽  
Vol 11 (32) ◽  
pp. 15206-15215 ◽  
Author(s):  
Chao Luo ◽  
Wen Li ◽  
Da Xiong ◽  
Ji Fu ◽  
Weiqing Yang
Keyword(s):  
Quantum Yield ◽  
Quantum Yields ◽  
Next Generation ◽  
High Definition ◽  
Spectrum Range ◽  
Photoluminescence Quantum Yield ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Spectral Ranges

The photoluminescence quantum yields (PLQYs) of all-inorganic halide perovskites in the green and red spectral ranges have approached over 90%, overwhelmingly arousing burgeoning interests for next-generation high-definition displays.

Quantification of Anisotropy-Related Uncertainties in Relative Photoluminescence Quantum Yield Measurements of Nanomaterials – Semiconductor Quantum Dots and Rods

2015 ◽  
Vol 229 (1-2) ◽  
Author(s):  
Christian Würth ◽  
Daniel Geißler ◽  
Ute Resch-Genger
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Semiconductor Quantum Dots ◽  
Quantum Yields ◽  
Photoluminescence Quantum Yield

AbstractIn order to assess the anisotropy-related uncertainties of relatively determined photoluminescence quantum yields (

scholarly journals AgCl-doped CdSe quantum dots with near-IR photoluminescence

2017 ◽  
Vol 8 ◽  
pp. 1156-1166 ◽  
Author(s):  
Pavel Aleksandrovich Kotin ◽  
Sergey Sergeevich Bubenov ◽  
Natalia Evgenievna Mordvinova ◽  
Sergey Gennadievich Dorofeev
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Yield ◽  
Reaction Yield ◽  
Cdse Quantum Dots ◽  
Optimal Conditions ◽  
Spherical Nanoparticles ◽  
Near Ir ◽  
Photoluminescence Quantum Yield

We report the synthesis of colloidal CdSe quantum dots doped with a novel Ag precursor: AgCl. The addition of AgCl causes dramatic changes in the morphology of synthesized nanocrystals from spherical nanoparticles to tetrapods and finally to large ellipsoidal nanoparticles. Ellipsoidal nanoparticles possess an intensive near-IR photoluminescence ranging up to 0.9 eV (ca. 1400 nm). In this article, we explain the reasons for the formation of the ellipsoidal nanoparticles as well as the peculiarities of the process. The structure, Ag content, and optical properties of quantum dots are also investigated. The optimal conditions for maximizing both the reaction yield and IR photoluminescence quantum yield are found.

scholarly journals A Highly Fluorescent Dinuclear Aluminium Complex with Near-Unity Quantum Yield

2021 ◽  
Author(s):  
Flavio Luis Portwich ◽  
Yves Carstensen ◽  
Anindita Dasgupta ◽  
Stephan Kupfer ◽  
Ralf Wyrwa ◽  
...  
Keyword(s):  
Excited State ◽  
Quantum Yield ◽  
Quantum Yields ◽  
Photoluminescence Properties ◽  
Excited State Lifetime ◽  
One Pot ◽  
Nonwoven Fabrics ◽  
Enhanced Photoluminescence ◽  
Photoluminescence Quantum Yield ◽  
Optical Applications

The high natural abundance of aluminium makes the respective fluorophores attractive for various optical applications, but photoluminescence quantum yields above 0.7 have yet not been reported for solutions of aluminium complexes. In this contribution, a dinuclear aluminium(III) complex featuring enhanced photoluminescence properties is described. Its facile one-pot synthesis originates from a readily available precursor and trimethyl aluminium. In solution, the complex exhibits an unprecedented photoluminescence quantum yield near unity (Φabsolute 1.0 ± 0.1) and an excited-state lifetime of 2.3 ns. In the solid state, J-aggregation and aggregation-caused quenching are noticed, but still quantum yields of 0.6 are observed. Embedding the complex in electrospun nonwoven fabrics yields a highly fluorescent fleece possessing a quantum yield of 0.9 ± 0.04.

scholarly journals New Unsymmetrically Substituted Benzothiadiazole-Based Luminophores: Synthesis, Optical, Electrochemical Studies, Charge Transport, and Electroluminescent Characteristics

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7596
Author(s):  
Pavel S. Gribanov ◽  
Dmitry A. Loginov ◽  
Dmitry A. Lypenko ◽  
Artem V. Dmitriev ◽  
Sergey I. Pozin ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Charge Transport ◽  
Active Transport ◽  
Cross Coupling ◽  
Luminous Efficiency ◽  
Charge Carriers ◽  
Quantum Yields ◽  
Electrochemical Studies ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield

Three new benzothiadiazole (BTD)-containing luminophores with different configurations of aryl linkers have been prepared via Pd-catalyzed cross-coupling Suzuki and Buchwald–Hartwig reactions. Photophysical and electroluminescent properties of the compounds were investigated to estimate their potential for optoelectronic applications. All synthesized structures have sufficiently high quantum yields in film. The BTD with aryl bridged carbazole unit demonstrated the highest electrons and holes mobility in a series. OLED with light-emitting layer (EML) based on this compound exhibited the highest brightness, as well as current and luminous efficiency. The synthesized compounds are not only luminophores with a high photoluminescence quantum yield, but also active transport centers for charge carriers in EML of OLED devices.

Quantum Yields of Crude Oils

1996 ◽  
Vol 50 (12) ◽  
pp. 1563-1568 ◽  
Author(s):  
Corie Y. Ralston ◽  
Xu Wu ◽  
Oliver C. Mullins
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Fluorescence Emission ◽  
Electronic Energy ◽  
Quantum Yields ◽  
Crude Oils ◽  
Excitation Wavelength ◽  
Dilute Solutions ◽  
Long Wavelength ◽  
Electronic Energy Transfer

Fluorescence quantum yield measurements are reported for visible and UV excitation for neat and dilute crude oil solutions, extending earlier work with excitation in the long wavelength visible and the NIR. Large and monotonically increasing quantum yields are found with shorter wavelength excitation (to 325 nm), and all crude oils are shown to have nearly the same relative dependence of quantum yield on excitation wavelength. These observations are explained by the energy dependence of internal conversion. Dilute solutions of light crude oils exhibit higher quantum yields than those of heavy crude oils because of their lack of large chromophores. The fraction of fluorescence emission resulting from electronic energy transfer (with subsequent fluorescence emission) for neat crude oils was previously shown to vary from ∼100% for ultraviolet excitation to ∼0% for near-infrared excitation; this large variation correlates well with and is explained by the very large variation in quantum yields with excitation wavelength. Comparison of quantum yields from neat and dilute solutions shows that quenching is the other major process which occurs with chromophore interactions. The quantum yields of a maltene and resin are large and similar, while the asphaltene exhibits much smaller quantum yields because of its lack of small chromophores.

Self-formed C-dot-based 2D polysiloxane with high photoluminescence quantum yield and stability

Nanoscale ◽  
2020 ◽  
Vol 12 (19) ◽  
pp. 10771-10780
Author(s):  
Guangqi Hu ◽  
Xiaokai Xu ◽  
Bingfu Lei ◽  
Jianle Zhuang ◽  
Xuejie Zhang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Carbon Dots ◽  
Fluorescence Emission ◽  
Quantum Yields ◽  
Dual Fluorescence ◽  
Photoluminescence Quantum Yield ◽  
Si Doped ◽  
Doped Carbon Dots

A novel 2D polysiloxane embedded with Si-doped-carbon-dots was synthesized, which shows dual-fluorescence emission, and high photoluminescence quantum yields and stability.

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

2013 ◽  
Vol 85 (10) ◽  
pp. 2005-2013 ◽  
Author(s):  
Ute Resch-Genger ◽  
Knut Rurack
Keyword(s):  
Quantum Yield ◽  
Optical Methods ◽  
Quantum Yields ◽  
Excited State Lifetime ◽  
Technical Report ◽  
Measurement Geometry ◽  
Relative Measurements ◽  
Selection Of ◽  
Dye Solutions

Procedures for the determination of photoluminescence quantum yields with optical methods are addressed, and challenges associated with these measurements are discussed. Special emphasis is dedicated to relative measurements of fluorescent (i.e., short excited-state lifetime), transparent, dilute dye solutions in conventional cuvettes in a 0°/90° measurement geometry. Recommendations on the selection of suitable quantum yield standards are presented, and requirements for the documentation of photoluminescence quantum yields are derived.

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