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Showing 1 to 20 of 71 for “"Phosphorescence"”.
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Quantitative Analysis by Room-Temperature Phosphorescence
An investigation of room-temperature phosphorescence (RTP) for quantitative analysis of analytes in complex real-sample matrices has resulted in significant improvements in accuracy and precision. A microprocessor-controlled phosphorimeter was developed for the measurements. A combination of real …
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Thermographic particle image velocimetry: from phosphorescence to incandescence
… proves that, apart from Mie scattering, phosphorescence image pairs can also be used to perform cross-correlation and calculate the vector field. Therefore both velocity and temperature field can be extracted from phosphorescence emissions excited by a single laser (UV-PIV). Thermographic …
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Synthesis, characterization, and lighting applications of group 11 metallopolymers with tunable phosphorescence
… synthetic strategies to obtain and enhance the phosphorescence of luminescent metallopolymer have been investigated. The first chapter includes an introduction to photoluminescence, luminescent group 11 monovalent complexes, metallopolymers and their application as light emitting diodes. The …
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From Quantum Mechanical Restrictions to Everyday Applications: Programmable Tags using Organic Phosphorescence
Organic phosphorescence at room temperature is a strongly growing field of research. Together with fluorescence, it describes the radiative transitions of organic molecules after excitation with light of appropriate wavelength. While fluorescence is a process on the nanosecond timescale, organic …
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New phosphorescence based probes and techniques for the analysis of cellular oxygen and respiration
Real time monitoring of oxygenation and respiration is on the cutting edge of bioanalysis, including studies of cell metabolism, bioenergetics, mitochondrial function and drug toxicity. This thesis presents the development and evaluation of new luminescent probes and techniques for intracellular O2 …
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Phosphorescence of a Series of Substituted Aceto- and Benzophenones in Crystalline form at Room Temperature
The present study was initiated in order to obtain uniform data on the o-o triplet energies of a series of benzo- and acetophenones under study as sensitizers in the photochemical cycloaddition of isophorone to 1,1-dimethoxyethylene. | A recording emission spectrograph with lifetime measuring …
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The lowest excited triplet state of some aromatic keto compounds: phosphorescence and optically detected magnetic resonance
Contains fulltext : mmubn000001_026587947.pdf (Publisher’s version ) (Open Access)
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Solution photochemistry of derivatives of Michler's Ketone
… than 100 psec. At 77 K both fluorescence and phosphorescence are observed. The phosphorescence spectra usually exhibited a shoulder to the red of the emission maximum, although a second peak is occasionally observed. In methylcyclohexane, phosphorescence lifetimes of the order of 10 - 20 msec …
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QUANTUM OBSERVABLES OF OPEN-SHELL SYSTEMS. A THEORETICAL STUDY
… systems: the electron spin density and the phosphorescence energy gap. In the first part, a comprehensive theory of the electron spin density topology is proposed for the first time [1]. Several new notions (spin density critical points, molecular spin graphs, spin density basins, spin …
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Enhancing the Performance of Pt(II)-Based Oxygen Sensing Probes by Expanding the Scope of N,C-Chelate and Ancillary Ligands.
… moiety substantially increased the quenching of phosphorescence. These changes are mainly due to the increase in phosphorescence decay lifetime allowing for a greater interaction between the excited state complex and O2, leading to efficient quenching. Majority of the films showed high …
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New photonic imaging systems for biomedical applications
… long pixel dwell times to measure long-lived phosphorescence. Other commonly used techniques include gated CCD and CMOS cameras, which lack single photon sensitivity and have a low frame rate. Moreover, the majority of the current PLIM systems use a microscopic format, while macroscopic …
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Hydroxypropylmethylcellulose: A New Matrix for Solid-Surface Room-Temperature Phosphorimetry
… (HPMC) as a new solid-surface room-temperature phosphorescence (SSRTP) sample matrix. The high background phosphorescence originating from filter paper substrates can interfere with the detection and quantitation of trace-level analytes. High-purity grades of HPMC were investigated as SSRTP …
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NEW ORGANIC AND HYBRID INORGANIC/ORGANIC LUMINESCENT MATERIALS
… Emission (AIE) and Room Temperature Ultralong Phosphorescence (RTUP) properties, whose discovery fueled further derivatization of the core: in fact, bio-active products, metal complexes and coordination polymers (CP), and phosphorescent organic emitters were synthesized and characterized. My …
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Sistemas de Pt(II) y Pt(IV) basados en cromóforos 2-arilbenzotiazol: propiedades ópticas y aplicaciones biológicas
… absorption and emission (fluorescence and/or phosphorescence) properties, which have been studied in different media (solution, solid or doped films at 298 K and 77K), obtaining the quantum yields and lifetimes of the emissions. In addition, the electronic transitions (absortion and emission), …
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Synthesis, structure and spectroscopic investigations of luminescent heterobimetallic gold(I)-Rhodium(I) species
… excitation spectra, emission spectra, and phosphorescence lifetimes of glass-solution and solid state samples at 77 K are reported for 2-5 and interpreted in context of crystallographic structure, electronic structure, and time-dependent density functional theory (TD-DFT) calculations. 2-5 …
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High pressure spectroscopic studies of organic device materials
… the electronic continuum. Photoluminescence and phosphorescence studies of a ladder type poly(para-phenylene) (PhLPPP) under pressure have given for the first time an evidence that the singlet-triplet splitting remains almost a constant under enhanced intermolecular interaction. For polymer …
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ORGANIC AND HYBRID INORGANIC-ORGANIC MATERIALS WITH INTRIGUING EMISSIVE PROPERTIES IN THE SOLID STATE
… fluorescence but also room temperature ultralong phosphorescence (RTUP, up to one second) associated with the presence of H aggregates in its crystal structure.[1] The introduction of halogen atoms (Br and I) or chromophoric fragments (2-Fluoropyridine) on the TT scaffold has proven to be a …
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Field Induced Polymer Electroluminescence
… polymers and small molecules. The phenomena of phosphorescence is exploited through the use of a host:guest emissive system to harvest both singlet and triplet excitons. Various polymer dielectric materials are studied to optimize the electric field on the emitting layers. Multiple organic …
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Synthesis and characterization of various ruthenium small molecules and metallopolymers for potential use in photovoltaic devices and luminescence properties of N-heterocyclic carbenes and trifluoro methylated tris(pyrazolyl)borate silver (I) acid-base adducts
… photophysical properties, including metal-free phosphorescence at room temperature with high quantum yield, multi-color emission from a single compound, and selective sensing of temperature and hazardous vapors.
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Triplet Excitons in Natural Photosynthetic and Artificial Light Harvesting Systems: Measurement and Modeling.
… (B)Chl molecule to quench 3(B)Chl states. Using phosphorescence spectroscopy and computational modeling, we investigated alternative, carotenoid independent, mechanisms which nature may employ to prevent 1O2 sensitization by lowering the energy of 3(B)Chl below that of 1O2. The two proposed …
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