Search Results - "Demas, J"

Aromatic Difluoroboron β‑Diketonate Complexes: Effects of π‑Conjugation and Media on Optical Properties by Xu, Songpan, Evans, Ruffin E, Liu, Tiandong, Zhang, Guoqing, Demas, J. N, Trindle, Carl O, Fraser, Cassandra L

“…Aromatic difluoroboron β-diketonate complexes (BF2bdks) are classic fluorescent molecules that have been explored as photochemical reagents, two-photon dyes,…”
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Multi-Emissive Difluoroboron Dibenzoylmethane Polylactide Exhibiting Intense Fluorescence and Oxygen-Sensitive Room-Temperature Phosphorescence by Zhang, Guoqing, Chen, Jianbin, Payne, Sarah J, Kooi, Steven E, Demas, J. N, Fraser, Cassandra L

“…Boron difluoride compounds are light emitting materials with impressive optical properties. Though their strong one- and two-photon absorption and intense…”
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Wavelength-agile high-power sources via four-wave mixing in higher-order fiber modes by Demas, J, Prabhakar, G, He, T, Ramachandran, S

“…Frequency doubling of conventional fiber lasers in the near-infrared remains the most promising method for generating integrated high-peak-power lasers in the…”
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Luminescence Oxygen Sensor Based on a Ruthenium(II) Star Polymer Complex by Payne, Sarah J, Fiore, Gina L, Fraser, Cassandra L, Demas, J. N

“…A novel quenchometric oxygen sensor based on a low polydispersity (PDI) star polymer [Ru(bpyPS2)3](PF6)2 (bpy = 2,2′-bipyridine, PS = polystyrene) is reported…”
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Emission Color Tuning with Polymer Molecular Weight for Difluoroboron Dibenzoylmethane-Polylactide by Zhang, Guoqing, Kooi, Steven E., Demas, J. N., Fraser, Cassandra L.

“…Difluoroboron dibenzoylmethane‐poly(lactic acid) emission is sensitive to the polarity of the surrounding medium. As the polymer molecular weight increases,…”
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Genetically Identified Suppressed-by-Contrast Retinal Ganglion Cells Reliably Signal Self-Generated Visual Stimuli by Tien, Nai-Wen, Pearson, James T, Heller, Charles R, Demas, Jay, Kerschensteiner, Daniel

“…Spike trains of retinal ganglion cells (RGCs) are the sole source of visual information to the brain; and understanding how the ∼20 RGC types in mammalian…”
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Luminescent Transition Metal Complexes as Sensors:  Structural Effects on pH Response by Higgins, Bernadette, DeGraff, B. A, Demas, J. N

“…A series of luminescent transition metal complexes using the pH-sensitive ligand 5-carboxy-1,10-phenanthroline has been synthesized and characterized. The…”
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Luminescence Lifetime Standards for the Nanosecond to Microsecond Range and Oxygen Quenching of Ruthenium(II) Complexes by Morris, Kaleem J, Roach, Michael S, Xu, Wenying, Demas, J. N, DeGraff, B. A

“…A rapid and reproducible method for determining the temperature dependence of luminescence lifetimes has been developed. With the use of this method, a set of…”
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Oxygen sensors based on luminescence quenching by DEMAS, J. N, DEGRAFF, B. A, COLEMAN, P. B

“…As an optical detection strategy, luminescence offers many advantages such as excellent sensitivity and selectivity. James N. Demas of the University of…”
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Modeling of Luminescence Quenching-Based Sensors: Comparison of Multisite and Nonlinear Gas Solubility Models by Demas, J. N, DeGraff, B. A, Xu, Wenying

“…Quenching-based luminescence sensors exhibit nonlinear Stern-Volmer quenching behavior. Two common explanations of the nonlinearity are either multisite…”
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Determining Proton Diffusion in Polymer Films by Lifetimes of Luminescent Complexes Measured in the Frequency Domain by Bowyer, Walter J, Xu, Wenying, Demas, J. N

“…Polymer-supported luminescent metal complexes represent an important class of oxygen, pH, and ion sensors. The diffusion properties of the analyte into the…”
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Viscosity and Temperature Effects on the Rate of Oxygen Quenching of Tris-(2,2′-bipyridine)ruthenium(II) by Reynolds, Evan W., Demas, J. N., DeGraff, B. A.

“…We compare the bimolecular quenching rate constant (k 2 ) of luminescent tris(2,2′-bipyridine)ruthenium(II) by oxygen in water, ethylene glycol and glycerol as…”
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Error Analysis of the Rapid Lifetime Determination Method for Double-Exponential Decays and New Windowing Schemes by Sharman, Kristin K, Periasamy, Ammasi, Ashworth, Harry, Demas, J. N

“…The rapid lifetime determination method (RLD) is a mathematical technique for extremely rapid evaluations of lifetimes in exponential decays. It has been…”
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Optimized Gating Scheme for Rapid Lifetime Determinations of Single-Exponential Luminescence Lifetimes by Chan, Sing Po, Fuller, Z. J, Demas, J. N, DeGraff, B. A

“…The rapid lifetime method (RLD) for determining excited-state lifetimes uses the ratio of the areas under two regions of the decay. To get good precision with…”
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Determining Oxygen Diffusion Coefficients in Polymer Films by Lifetimes of Luminescent Complexes Measured in the Frequency Domain by Bowyer, Walter J, Xu, Wenying, Demas, J. N

“…Polymer films doped with luminescent ruthenium complexes are proving to be important oxygen sensors. We describe a technique using lifetime measurements in the…”
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Photostability of Luminescent Ruthenium(II) Complexes in Polymers and in Solution by Fuller, Z. J, Bare, W. D, Kneas, K. A, Xu, W.-Y, Demas, J. N, DeGraff, B. A

“…The effects of oxygen on the photochemical properties of ruthenium(II) complexes in solution and in polymers are reported. In solution, the complex is actually…”
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Ruthenium(II) Tris(bipyridine)-Centered Poly(ethylenimine) for Gene Delivery by Fiore, Gina L, Edwards, James M, Payne, Sarah J, Klinkenberg, Jessica L, Gioeli, Daniel G, Demas, J. N, Fraser, Cassandra L

“…Ruthenium(II) tris(bipyridine)-centered poly(ethylenimine) (Ru PEI) was synthesized via acid hydrolysis of Ru tris(bipyridine)-centered…”
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Comparison of Methods for Rapid Evaluation of Lifetimes of Exponential Decays by Moore, Christopher, Chan, Sing Po, Demas, J. N., DeGraff, B. A.

“…For evaluating exponential luminescence decays, there are a variety of computational rapid integral methods based on the areas of the decay under different…”
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Ruthenium Tris(bipyridine) Complexes with Sulfur Substituents: Model Studies for PEG Coupling by Fiore, Gina L, Goguen, Brenda N, Klinkenberg, Jessica L, Payne, Sarah J, Demas, J. N, Fraser, Cassandra L

“…Ruthenium polypyridyl complexes are incorporated into polymers for sensing and light emitting materials applications. Coupling reactions between metal…”
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Applications of luminescent transition platinum group metal complexes to sensor technology and molecular probes by Demas, J.N., DeGraff, B.A.

“…Luminescent transition metal complexes are currently revolutionizing many areas of photochemistry and photophysics. In particular, they are proving useful as…”
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